DitherPaint81

Products: DitherPaint81
Date: 2021
Type: Cassette
Platform(s): TS 1000
Tags: Art

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.

Program Analysis

Program Structure

The program is extremely compact at the BASIC level, consisting of only four logical lines:

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823

The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.

Machine Code Architecture

The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.

The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.

Key Memory Addresses

Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)

Dithering Implementation

The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).

Notable Techniques

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.

Bugs and Anomalies

No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.

Content

Appears On

Related Products

Port of DITHERPAINT99 (for the TI99/4A with EXTENDED BASIC) that has been optimized for the Sinclair ZX81/Timex 1000 computers. Changes...

Related Articles

Related Content

Image Gallery

Source Code

   0 REM \BF\BD\AC\B9\C3\B4\C3\C3\C3F\C3\C3\C3\AB\C3\C3C\C3\DE\C3\C3A\C3\C3\B8\CFC\E5\D5\AF\CD\CBCE\CD\CD itemtype='https://schema.org/Blog' itemscope='itemscope' class="wp-singular computer_media-template-default single single-computer_media postid-51854 wp-custom-logo wp-embed-responsive wp-theme-astra wp-child-theme-astra-child ast-desktop ast-separate-container ast-left-sidebar astra-4.13.8 group-blog ast-blog-single-style-1 ast-custom-post-type ast-single-post ast-inherit-site-logo-transparent ast-hfb-header ast-full-width-primary-header ast-box-layout ast-normal-title-enabled astra-addon-4.13.6"B\CD itemtype='https://schema.org/Blog' itemscope='itemscope' class="wp-singular computer_media-template-default single single-computer_media postid-51854 wp-custom-logo wp-embed-responsive wp-theme-astra wp-child-theme-astra-child ast-desktop ast-separate-container ast-left-sidebar astra-4.13.8 group-blog ast-blog-single-style-1 ast-custom-post-type ast-single-post ast-inherit-site-logo-transparent ast-hfb-header ast-full-width-primary-header ast-box-layout ast-normal-title-enabled astra-addon-4.13.6"A\E8\CD
			
			




			
			

		

							

				
					

				

	


	


		
					

				




	
	



	
	
		


			
			
DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












Content















Appears On















Related Products






Port of DITHERPAINT99 (for the TI99/4A with EXTENDED BASIC) that has been optimized for the Sinclair ZX81/Timex 1000 computers. Changes...














Related Articles















Related Content















Image Gallery






  
    
    










Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Port of DITHERPAINT99 (for the TI99/4A with EXTENDED BASIC) that has been optimized for the Sinclair ZX81/Timex 1000 computers. Changes...














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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Port of DITHERPAINT99 (for the TI99/4A with EXTENDED BASIC) that has been optimized for the Sinclair ZX81/Timex 1000 computers. Changes...














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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Port of DITHERPAINT99 (for the TI99/4A with EXTENDED BASIC) that has been optimized for the Sinclair ZX81/Timex 1000 computers. Changes...














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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Port of DITHERPAINT99 (for the TI99/4A with EXTENDED BASIC) that has been optimized for the Sinclair ZX81/Timex 1000 computers. Changes...














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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Port of DITHERPAINT99 (for the TI99/4A with EXTENDED BASIC) that has been optimized for the Sinclair ZX81/Timex 1000 computers. Changes...














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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Port of DITHERPAINT99 (for the TI99/4A with EXTENDED BASIC) that has been optimized for the Sinclair ZX81/Timex 1000 computers. Changes...














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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Port of DITHERPAINT99 (for the TI99/4A with EXTENDED BASIC) that has been optimized for the Sinclair ZX81/Timex 1000 computers. Changes...














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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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DitherPaint81

			
		


	
	
	


							

				




Products: DitherPaint81



Date: 2021


Type: Cassette


Platform(s): TS 1000



Tags: Art



					

				
		

DitherPaint81 is a painting program that implements ordered dithering to simulate grayscale tones on a black-and-white display, ported from a TI-99/4A Extended BASIC original. The program stores its entire runtime engine as Z80 machine code embedded across multiple REM statements, with execution launched via a single `LET L=USR 18823` call in line 9. The machine code occupies lines 0 and 2, and a third REM at line 3 provides a compiler identification string noting both the ZXGT compiler address (17389) and program entry point (18823). The architecture uses a compiled token interpreter (the ZXGT compiler) rather than the native BASIC interpreter, allowing significantly faster execution than pure BASIC would permit.










Program Analysis





Program Structure





The program is extremely compact at the BASIC level, consisting of only four logical lines:





    

  1. 0 REM — primary machine code block (the bulk of the runtime engine)
    2. 




  2. 2 REM (first instance) — secondary machine code block (compiled program data and dither pattern tables)
    3. 




  3. 2 REM (second instance) — tertiary machine code block (additional compiled routines)
    4. 




  4. 3 REM — human-readable compiler identification string: TAN -ZXGT COMPILER - ZXGT=17389 PROG=18823
    5. 




  5. 9 LET L=USR 18823 — sole executable BASIC statement; transfers control to machine code at address 18823
    6. 






The duplicate line number 2 is intentional: the second REM at line 2 follows immediately in memory after the first, forming a contiguous machine code region. The BASIC interpreter only ever reaches line 9 via normal execution, which immediately hands off to machine code.





Machine Code Architecture





The REM data in line 0 begins with a dense jump table — a sequence of C3 (JP) opcodes fanning out to named subroutines throughout the code. This is a standard technique for building a relocatable subroutine library where callers use fixed offsets from the REM base address. The compiler identification string in line 3 identifies this as output from the ZXGT compiler, a TAN product that compiles a higher-level language (likely a structured BASIC or intermediate language) down to Z80 machine code, explaining why the machine code is far too voluminous and systematic to have been hand-assembled.





The entry point noted is address 18823 (decimal), which corresponds to the start of the compiled program payload inside the REM at line 2. The ZXGT runtime itself sits at address 17389, within the line 0 REM block.





Key Memory Addresses





Address (hex)Address (dec)Role
0x400016384Display file / RAM base; used extensively as pointer base
0x43C017344Approximate start of line 0 REM machine code
0x43BF / 0x40BF—System workspace variables referenced by compiled code
0x43FC / 0x4400 region~17408Jump table base in line 0 REM
0x43ED / 1738917389ZXGT compiler runtime entry (per line 3 comment)
0x4947 / 1882318823Compiled program entry point (USR target in line 9)





Dithering Implementation





The compiled program encodes extensive ordered dithering pattern tables inside the line 2 REM blocks. The machine code sequences repeatedly load 16-bit pointer values, call a common render primitive (e.g., the subroutine at 0x4968 / CD 68 49 appearing dozens of times), and advance through pattern data. The patterns encode Bayer-style or threshold-matrix dither levels, allowing the black-and-white pixel display to approximate multiple shades of gray across a painted canvas. Separate pattern sets visible in the data correspond to different density levels (density variables stored at addresses like 0x4999, 0x49D1).





Notable Techniques





    

  • ZXGT compiled output: Rather than interpreted BASIC, all logic is compiled Z80, giving near-assembly performance for pixel-level dither painting operations.
    • 




  • Jump table in REM: Line 0 REM opens with 14+ consecutive JP nnnn (C3 xx xx) instructions, forming a stable API surface the compiled program calls into by offset.
    • 




  • Duplicate line numbers: Two separate REM statements share line number 2, creating a contiguous machine code region across what appears to BASIC as a single line but occupies two distinct memory records.
    • 




  • USR entry via LET: LET L=USR 18823 discards the return value; the USR call never returns to BASIC in normal operation — the compiled program manages its own event loop.
    • 




  • Pointer-heavy Z80 idioms: Extensive use of ED 52 (SBC HL,DE), ED 4B (LD BC,(nn)), ED 53 (LD (nn),DE), and ED B0 (LDIR) for block moves reflect systematic compiler output rather than hand optimization.
    • 




  • Self-referential workspace: Variables tracking cursor position, current dither level, canvas pointer, and brush state are stored at fixed absolute addresses in low RAM (the 0x40xx region), directly accessed by the machine code without going through the BASIC variable table.
    • 






Bugs and Anomalies





No BASIC-level bugs are present — the program is intentionally minimal. The duplicate line-2 REM records are a known side effect of the ZXGT compiler’s output format and are not an error. The GO TO to non-existent lines and the use of VAL "number" constructs visible in the compiled code are standard compiler idioms.


		
							

				












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Source Code





   0 REM 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   2 REM \21\7D\40\E5\22\79\40\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\23\23\4E\23\46\09\23\D1\A7\ED\52\22\77\40\EB\2A\04\40\73\23\72\23\EB\2A\79\40\ED\4B\77\40\ED\B0\AF\C9\CD\E7\02\21\3B\40\CB\B6\2E\7D\E5\2A\04\40\4E\23\46\E1\E5\C5\CD\A3\09\2A\04\40\23\23\C1\D1\ED\B0\AF\C9\7D\40\00\00\75\00\00\00\00
   3 REM   TAN -ZXGT COMPILER -         ZXGT=17389 PROG=18823
   9 LET L=USR 18823










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