RAMs, ROMs, and EPROMs
Stephen Adams
RAM Pack Anti-Wobble. £6.
A metal clamp that completely eliminates RAM pack wobble. It includes the capacity for printer and other equipment. No screws or glue required and completely removeable with no trace. No soldering or electrical experience necessary to fit. Cheaper than ribbon cable and more reliable.
Apropos Technology
Sin 16
$35 pp. Visa/MC. (805) 482-3228 (24 hrs.).
SIN16 a 16384 byte RAM for the ZX81 or TS1000 computers. Fully compatible with all Timex/Sinclair products. Efficient design allows SIN16 to use little power which leaves more power for other attachments and reduces heat build-up. Its gold-plated heavy-duty connector disallows “glitches” and the resulting program losses. Complete with a manual, self-test program, display case, 10 day return privilege and 6 month warranty.
Byte-Back Co.
16K RAM Pack (M-16)
Kit: $59.95.
Wired and Tested: $69.95.
M-16 blank PCB: $19.95.
Stacks the M-16 with your Sinclair RAM pack or with other M-16’s.
64K RAM Pack (M-64)
Kit: $119.95.
Wired and Tested: $129.95.
M-64 blank PCB: $19.95.
Plugs directly into your computer; allows use of printer; no extra power supply needed; area from 8-16K can be switched out in 2K increments for memory mapped peripherals, PROMs, etc.
Comprocsys, Ltd.
ZX.Aszmic ROM. $49 (incl. s&h; special USA price).
A plug in replacement ROM for the Basic ROM. Redefines the hardware and transforms it into an assembly language programming unit. Offers: Full Screen Editor: 16 shift keys give a word processor feel to control programming. Multi-file System: Declare as many files as you want and they are handled by the Operating System. Total Assembler: Full Z80 mnemonics. Powerful Debug: All the usual commands and more. Hi-Res Graphics: 255 x 144 resolution under program control. And much more. Write for details.
External Board. $15.
Board with EPROM programmer, room for 8K EPROM, centronics and RS232 interfaces, and more. Write for details.
Data-Assette
16K Econo Tech RAM Pack. $44.95.
Budget model 16K RAM supplied without case, absolutely no other difference. Fully guaranteed.
Kayde 16K RAM Pack. $49.95.
Kayde 16K RAM Packs comes fully cased and are of course, plug compatible. Designed specifically for the TS1000 and the ZX81. Proven reliability. Does not overheat and will not lose memory.
Downsway 16K RAM Pack. $49.95.
Downsway 16K RAM Packs are fully cased and simply plug into the rear port of the computer. Needs no extra power supply and is compatible with all accessories for either the TS1000 or ZX81.
Jigsaw 32L RAM Pack (RP04). $99.95.
This stand alone 32K RAM Pack will upgrade your unit to a full 32K from the start. Plug compatible with our 32K Plus to upgrade to a 64K. LED indicates “Power On.”
Jigsaw 32K Plus (RP02). $109.95.
Designed specifically for the TS1000 and the ZX81, the 32K Plus operates in tandem with a 16K to provide up to 48K RAM. Plugs directly into the computer rear port and is compatible with the Data-Assette ZX99. LED indicates “Power On.” Uses the computer’s power without modification.
ZX-Panda Expansion Module. $44.95.
Plug-in module easily installed into the existing 16K Panda case, extending the memory to 32K.
Jigsaw 64K RAM Pack (RP03). $149.95
Specifically designed for the TS1000 and the ZX81. Plugs directly into the rear port of the computer. 64K Bytes of RAM extends the memory by 56K. LED indicating “Power On.” Uses computer’s power, no additions necessary. Single board design for reliability and economy.
ZX-Panda
Expandable 16K RAM Pack. $55.95.
Contoured case fits snugly against the rear of the computer for a sure fit. LED indicates “Power On.” Easily expandable to 32K with simple plug-in module that fits inside the existing case, no tools or soldering needed. Allows for inexpensive upgrading at any time.
Jigsaw 16K RAM Pack
RP01. $49.95.
Designed specifically for the TS1000. Plugs directly into the rear port of the computer, and can be used with our own Jigsaw 32K Plus to upgrade to 48K! LED indicates “Power On.” No additional power requirements.
DCP Microdevelopments Ltd.
DCP P/A/C Packs. From £20.
P-Pack gives 4K CMOS RAM. A set of packs giving ZX81 memory, control and analogue interfaces. The P-Pack plugs into rear of ZX81/TS1000 and gives 4K of extra CMOS RAM plus I/O Port. The Analogue Pack or Control Pack onto the rear of the P-Pack. Cased and assembled.
Down East Computers
RAM chip 6116P-3. $11.95 plus $3 s&h.
Static RAM, (2K x 8). With instructions for upgrading 1K ZX81 to 2K.
EPROM Services
8K EPROM Board. $31.
Allows up to 8K of EPROM or RAM in 2K blocks to be added in the 8/16K ZX81 memory map. Supplied with EPROM I which contains 40 toolkit type routines, e.g., scroll up/down/left/right, free memory, renumber program length. A range of 2K EPROMs to fit this board are available at £10 each: Rapid LOAD/SAVE, MC Monitor, Disassembler, Graphics.
I/O Board (Port). $25.
A 32 line I/O board. Port mapped to 4 absolute locations. Port A has 8 LED indicators. Port B has 8 outputs. Splits into 2 ways each so one instruction can be used to switch between two peripherals. Port C is uncommitted. A status indicator ($9) gives a 16 LED indicator of the state of Port B. A precision D/A board ($15) fits Port C.
Graphics Generator. $39.
A peripheral enabling alternate character sets to be used and printed either from EPROM or UDS in RAM. 4K of EPROM is supplied containing 4 character sets and routines to define print, copy, LPrint, and switch between character sets. A further 2 x 2K of RAM or EPROM can be added.
Expense Cutters Products, Inc.
Crash Guard
$19.95 plus $1.50 s&h; Visa/MC.
An attractive, professional solution to the problem of crashes from accidental RAM pack jiggle. Adds a good solid feel to your computer. Installation takes less than one minute.
Gladstone
RAM Packs
16K RAM (G16). $49.95.
64K RAM (G64). $149.95.
Coming: 32K RAM (G32). $99.95.
Reliable memory units that will not “crash” at critical moments. Made in USA, metal casing gives better shielding, quality edge connector, snug fit to back of computer with no “wobble,” 6 month warranty. 32K RAM designed to stand alone or piggyback with the 16K unit to provide 48K.
Memotech’s Memopak Range.
Memopak 64K (A64). $179.95.
Memopak 32K (A32). $109.95.
Memopak 16K (A16). $59.95.
Memic
CRAMIC-81 (C12). $179.95.
A 16K RAM pack using CMOS technology to store data almost indefinitely. Loads almost instantly with virtually zero chance of error. Requires only a tiny amount of power supplied by a lithium battery (10 year life) to retain data in standby mode. Computer supplies power for active mode. Behaves like an ordinary RAM pack, but it can be powered down and removed. Ordinary RAM pack can be simultaneously connected.
Memic
Memic-81.
2K Version (C10). $59.95.
4K Version (C11). $69.95.
Accessory with 2K or 4K CMOS memory. Allows user to write and store Basic or MC programs for a minimum of 5 years even with power disconnected. Programs load almost instantly. Especially useful for business or engineering applications. Resides in the 8-12K area of memory. Can be used with other RAM packs.
Memic
ROM-81 (C13). $34.95.
A 2K-8K ROM/EPROM Unit. Enables user to read useful routines and commonly used information, stored in U.V. erasable, programmable ROM. Supplied without EPROMs. Accepts either 2716 or 2732 EPROMs to allow up to 8K of memory in 2K increments. Separate 2K and 4K decoding is link selectable. Sockets decoded to lie within 8K and 16K in the TS1000. Additional circuits for slow EPROMs.
BASICare Micro System.
A series of stacking modules allowing the user to select the expansion he needs. Includes: Persona, Minimap, RAM 16, RAM 64, Drom, Toolkit, Pericon a, Pericon b, Pericon c. Listed by category in this issue.
Persona (B20). $59.95.
An interface module to enable Organic Micro to grow. Buffers in all the signals from the expansion port via a ribbon cable. Talks to other modules via 64-way Organic Bus configured to fit onto the given ZX81 Memory Address Map.
Minimap (B21). $59.95.
The key module for adding large amounts of memory although a few memory modules can be used without it. Extends the 64K of address space up to a possible 1Mbyte. Organized into vertical 64K pages. Up to 16 pages. Can be defined from within the program.
RAM 16 (B23). $49.95.
Add 16K RAM. On board address decoding permits simultaneous use of many RAM 16 modules in conjunction with Minimap.
RAM 64 (B24). $149.95.
64K RAM arranged as 4 blocks of 16K all of which can be used simultaneously under the control of the Minimap.
DROM (B25). $74.95.
Ultra low power memory backed by rechargeable battery for non-volatile storage of programs and data. Valuable for saving programs under development or often used routines or data. Makes cassette saving and loading unnecessary. Individual 2K blocks can be protected against accidental overwriting.
Pericon a (B27). $54.95.
A general purpose, user programmable device with 24 lines of I/O. Up to 4 can be used simultaneously allowing basic I/O, strobed I/O, and bidirectional 8 bit data transfer with handshakes.
Pericon b (B28). $59.95.
Access and control of outside world. 24 lines capable of directly operating relays or driving long signal lines. On board address decoding allows simultaneous use of up to 4 such modules.
Pericon c (B29). $74.95.
Centronics type parallel interface permitting an 80-column dot matrix printer to be connected.
Micro Development Line.
MD Beeper/Clock/Switch Board (M72).
$79.95.
Provides for timing, periodic input or measurements, manual start/stop, and sound alert for operator. Board mates to MD bus via 2 standard 16 pin ribbon cables. Clock set up as a 15 bit stop watch; has a resistor capacitor time base; can be switched for 0.1 or 1.0 second intervals. Beeper on board. Sample programs.
MD I/O Expansion Board (M70). $89.95.
Board mates to ZX81 edge connector via a custom made cable. For inexperienced users the A/D-D/A Expansion Board is recommended. Sophisticated users will be able to connect their own devices to the MD I/O Board which provides a bus, similar in function to an S-100 bus and which buffers and decodes address lines, inhibits the internal RAM (and external RAM) when I/O is selected, accepts optional 16K RAM on a Sinclair type edge connector.
MD A/D-D/A Expansion Board (M71).
$89.95.
Provides 2 channels of ADC and 2 channels of DAC. 8-bit resolution is obtained in 100 microseconds. I/O command requires a single line of PEEK or POKE. Sample programs.
Hunter
8K Nonvolatile CMOS RAM/EPROM Board
$29.95 plus $1.95 s&h.
Designed to fill the 8-16K memory block. Store your own system utilities or build a library of machine language routines. Can be used for HOT-Z or other firmware in EPROM. Can be used with any ROM or RAM. Available assembled. See ad in this issue.
Memotech Corporation
Memopak 16K Baseline. $49.95.
The 16K Baseline is the most economical way to add memory to your TS1000. It is fully compatible with Memopak 16K and 32K RAMs to provide you with up to 32K or 48K RAM respectively.
Memopak 16K RAM. $59.95.
The Memopak 16K RAM offers expansion capabilities through its “piggy back” connection and is fully compatible with Timex or Memotech 16Ks to give a massive 32K RAM.
Memopak 32K RAM. $109.95.
The 32K Memopak enables you to execute sophisticated programs and store large data bases and like the 16K RAM is fully compatible with Timex’s or Memotech’s 16K RAMs to give you a full 48K RAM.
Memopak 64K RAM. $179.95.
The 64K Memopak is powerful enough to turn your TS1000 into a computer with capabilities suitable for business and educational use. It accepts such Basic commands as 10 DIM A (9000).
Orme
2K “Toolkit” Preprogrammed EPROM
1K plus. $12.
Works with EPROM-READ CARD. 2716 EPROM operating in 8192-10239 part of memory-map. Programmed with Breakout, Life, and Toolkit (Renumber, including GOTO and GOSUB; READ, DATA, RESTORE; BLOCK-FILL, of screen; block delete, part of program; size, of program; free memory and others).
EPROM-READ Card
1K-16K RAM. $15; s&h $3.50.
The EPROM-READ card accepts 2K 2716 and 2516 EPROMS. No RAM is used. Operates in the ROM space 8192-10239 of the memory map. The EPROM-READ card fits between the computer (or printer) and the 16K RAM pack. With modification it is compatible with certain other types of RAM. (Greater than 16K). A pre-programmed EPROM is available.
EPROM Programmer
1K plus. $45 p&h $3.50.
The EPROM programmer programs EPROMs directly in the 8192-10239 part of the memory map. The bytes to be stored being POKEd directly at the required address. Full software and instructions supplied. 25VDC stabilized power-supply for the programmer; $13 plus $5 s&h, from 110V or 240VAC. (please specify).
RAMstrap
RAMstrap. $3.00 pp.
RAMstrap is designed to help users with RAM pack wobble crashes. It holds your RAM pack firmly in place by means of a powerful elastic strap which fastens to anchors installed on your computer; no holes. Strap, anchors, and directions supplied.
Sunflower Systems
Sunflower Systems
64K RAM. $119.95 plus $5 s&h.
Maximum memory, minimum price! Large data bases, pages of workspace for word processing; spreadsheets with many rows and columns, huge, complex adventures. All these and more can be yours with our 64K RAM! We offer the lowest price for an American manufactured, fully cased, assembled and tested 64K RAM.
Wisconsinc Electronics
EPROM Copier P-2. $35.
Copier programs 2716 EPROMs with data provided by a X2816A EEPROM or another 2716 EPROM. Ideal for low-cost permanent storage of data or programs. Operates on batteries (not included). Nonvolatile X2816A EEPROMs and 2716 EPROMS available at competitive prices.
Interfaces, Boards, and Connectors
Advanced Digital Innovations
Slow Mode
For 4K ROM ZX80/MicroAce users.
Can’t use SLOW mode? Keyboard worn out? Our custom systems can turn your ZX80/MicroAce into a machine more powerful than the ZX81, e.g., run with either 4K or 8K ROMs, battery back-up, I/O ports, custom cases, a standby display for use when no TV is available. Most options also available for the TS1000 and ZX81.
Aerco
FD-ZX Floppy Disc Interface
16K RAM Min. $179.
Interfaces Sinclair computers to industry standard Shugart compatible floppy disc drives. Controls from 1 to 4 drives of any size, single/double density, single/double sided except double density not available for 8″ drives. Includes driver software in EPROM.
ZX-SB STD Bus Interface. $99.
Interfaces Sinclair to industry standard computer bus. Allows choice of hundreds of peripheral interface cards from numerous manufacturers.
ZX-CA Ribbon Cable Assembly. $20.
Ribbon cable allows reliable connection between Sinclair computers and plug-in peripheral devices. Completely eliminates problems from jiggling peripherals.
DV-1 Direct Video Modification. $15.
Allows connection of standard (composite video) computer monitor to Sinclair computers for noise-free display. 2 transistor circuit requires installation inside computer.
Artisan Electronics
Kote Jack
One half oz. kit: $5.95 plus $1 s&h.
A jelly-like professional compound to provide an occlusive deterrent to dirt and oxidation once contacts are cleaned and mechanical contact assured in low level mechanical switching and various metal-to-metal transfer interfaces such as audio jacks, signal plugs, card edge connectors, and a myriad of pin connects. A long term cure for system “crashes” with RAM packs, power and data connectors.
Strap Down. Kit: $5.95 plus $1 s&h.
Prevent RAM pack wobble, system crash, and flopping cables. Kit contains high strength, precut and punched strap to hold down the computer and RAM pack, cable clamp to organize cables. Computer can be fastened to portable board or desk top. No modifications required. Takes 5 min. to install.
Atto-Soft
Joystick. $14.
Turn your computer into an arcade style game player. Designed for use with Atto-Soft’s ZX-Man, but includes software examples to help you write your own programs. For ZX80/81 or TS1000.
Basicare Micro System
A range of low priced modular add-ons to vastly increase the capabilities of your computer. The PERSONA, the system expansion controller, allows stacking further units to create a system tailor-made for your purposes. Units include: 16K to 64K RAM, EPROM module to non-volatile memory with battery back up, I/O port to centronic printer interface, sound synthesizer to A to D, D to A converters. Write for details.
Bob Berch
ZX Serial Printer Interface
Plans and listing: $5.
A fast, inexpensive, relatively easy way to connect a ZX computer to any serial printer. Outputs a ASCII RS232 signal through the MIC port. Supplied as hardware plans and software listing. Hardware costs less than $10, requires one connection within case. Software is 280 bytes of relocatable machine code; provides printing of characters, strings, program listings, and screen copying.
Byte-Back Co.
Modem (MD-1)
Kit: $119.95.
Wired and tested: $149.95.
Allow you to connect your computer to the largest computer networks, e.g., University Computers, Dow Jones, UPI. Dial a phone number, press a few keys, and watch the data appear on your screen. Software included. RS232 port provided to allow you to drive all RS232 peripherals.
RS232 Module
Kit: $59.95.
Wired and Tested: $69.95.
Allows you to connect your computer to all RS232 printers and terminals.
Control Module (BB-1)
Kit: $59.95
Wired and tested: $69.95.
8 independent relays with LED status indicators; 8 independent TTL inputs with Schmitt trigger buffers. Single POKE command changes and latches the status of each of the relays. PEEK command reads the status. Comprehensive manual.
Bytesize Computer Products
The Z-Dubber. $31.95 pp.
Connects between the cassette recorder and your computer. Greatly increases the ease of loading a program correctly the first time. Lets you connect two cassette recorders together to make perfect duplicates of your cassette programs.
CAI Instruments Inc.
Network Communications Package
$149.95.
Package consists of the ASCII firmware program, Modem (acoustical), and modem cable. This with the CAI/O board allows the TS1000 and ZX81 computers to communicate with mini and mainframe computers. The information comes in with no screen flicker and can be viewed, stored, and printed if desired. (This feature is on all the serial programs by CAI.)
Serial Printer Firmware. $24.95.
The serial printer firmware is contained in the ASCII Firmware and when used with the CAI/0 board, allows the user to communicate with other computers and with serial devices such as printers and teletypes. Serial communications can be performed at BAUD rates of 110 to 9600 using simple keyboard commands.
CAI/0 Board. $79.95.
The CAI/0 board is an input/output interface which is designed to allow the TS1000 and ZX81 computers to communicate with serial (BAUD rates program selectable between 100 and 9600) and parallel (Centronix) printers, or with computer networking systems. The parallel port can also be used to control lights and many different devices around the home, office, or laboratory.
ASCII Communications Firmware.
$24.95.
The CAI/ASCII firmware is used with the CAI/0 board. Converts the non-standard Sinclair code to standard ASCII code allowing the TS1000 and ZX81 computers to communicate with other micro/mini computers (Apple, Commodore, TRS-80, IBM, etc.) and main frames with computer networking systems.
Computer Continuum
Analog Interface Board.
Assembled and tested: $230.
Kit: $180.
A/D 8 channels plus D/A 8 channels high speed 8 bit all purpose interface board. Works on any Sinclair computer and includes features for easy interfacing to other brands. Many mounting options: Box and ribbon cable: $15; Piggy back kit: $15. Software for digital scope and spectrum analysis.
Buffered Bus/Development Board
Kit: $65.
Bare Board,connector, manual: $40.
Fully buffered with four types of connectors to connect to prototyping cards or peripherals. Circuit frees 8K of addresses for your use. Provision for voltage regulator. Fits ZX80/81, MicroAce, T/S1000; no ROM or RAM requirements.
Ribbon Cable Connector
Female ribbon connectors fit on to Sinclair computer: $7. Male ribbon connector fits onto peripherals: $7.
UHF Modulator. $15.+ s&h.
Replaces the VHF (ch 2-3) modulator on the ZX81 circuit board. UHF receiver is much less sensitive to the interference which is radiated from the computer or its peripheals. Makes using your TV possible with unshielded peripherals.
Computer Engineering Services
ZX80 Video Upgrade Kit
$12.95 plus $1.20 s&h.
Get FAST and SLOW modes on your ZX80 with 8K ROM. PCB with complete instructions and parts list. PCB. will work with new ROMs if installed properly.
Cosmonics
Cosmonics Plans for an RS232C TTL Level Converter. $6.50 plus $1 s&h.
These plans allow you to construct an RS232 TTL Level Converter from simple, inexpensive hardware components. The plans are written in a step-by-step manner, and include diagrams. This converter, when used with the Cosmonics TTL Serial Input/Output Port Package, will allow you to connect a TS1000 or ZX81 to most RS232C peripherals.
Cosmonics TTL Serial Port Software
4K RAM. Cassette: $18 plus $1.50 s&h.
Provides the proper timing for RS232C; translation between the ASCII character set and the Sinclair character set. Allows the user to connect his computer to a modem, printer, or terminal via use of TTL input/output port plans and an RS232C TTL level converter. Plans for ports and converter are available from Cosmonics.
Cosmonics TTL Serial Input/Output Port Package
4K RAM. $26 plus $1.50 s&h.
This package contains Cosmonics TTL Serial Port Software, plans for building input and output ports which reside inside a ZX81 or TS1000, and necessary hardware components. When this package is used with an RS232 TTL Level Converter, the user may connect his computer to most RS232C peripherals.
CRC Software
CRC Smart Soft Face. $109.95.
Interfaces printers to the Sinclair; serial; parallel; uses no RAM; no USR routines; any printer; single key operations.
DCP Microdevelopments Ltd.
DCP Interspec Pack. £39.95.
Complete interface pack for ZX81 or Spectrum. Contains: 8 bit 8 channel A-D converter, 4 relays, 4 switch inputs, 8 bit input port and 8 bit output port. Also DCP bus at rear of unit for other addons. Fully cased and assembled with manual.
Data-Assette
Jigsaw Tape Load Interface (ZX22).
$39.95.
Power Driven Cassette Loading Interface. Easy and reliable loading of information. Device detects incoming signals and automatically adjusts to level of that required by the computer. Red and Green LEDs give a positive indication as to whether or not the program is loading. Powered directly by the computer’s adapter.
ZX-21 Metered Loading Interface.
$19.95.
Vu Meter allows you to preset your tape recorder to a level that is compatible with your computer, gives you a visual indication of the power of your signal. Also available is a “Test Alignment Tape” and a booklet “The Microcomputers Users Book of Tape Recording.”
ZX98 Parallel and Serial Interface.
$99.95.
Both Parallel and Serial on one board. Turn your computer into a terminal for ON-LINE services or use it to communicate to other computers. Interface with any printer having a parallel or serial port. Several unique features include LLIST, LPRINT, COPY, and MEMORY EXAMINATION of HEX BYTE.
Down East Computers
VOTEM
Kit: $39.95 plus $3 s&h.
Assembled and tested: $59.95 plus $3 s&h.
Analog Interface and Tape Signal Conditioner. 1K and up. Hardware/Software package to measure voltage and temperature. Voltages: 0 to +1V (expandable). Temperatures: -25 to +125C. Extremely sensitive (high resolution): 0.00004V or 0.05C. Computer becomes “smart” voltmeter or digital thermometer with storage. No modifications required. Connects to tape input. 35-page User’s Manual, cable, and temperature probe. Documentation alone: $5 (applied to first unit).
Temperature Probes for VOTEM. $5 pp.
Ener-Z Co.
Report Generator
$69.95 plus 3 s&h.
Data acquisition and control. Standard Centronics printer interface. CMOS real time clock calendar with batter backup. 8 bit parallel I/O ports. CMOS A/D converter. Features: Bus connector for RAM pack; machine code listings included; I/O mapped. Assembled and tested.
Gladstone
Memotech
Memopak Centronics Type Parallel Printer Interface (A71). $104.95.
Interface Innovations
Screenmate.
1K RAM. $49.95.
Offers two exciting and useful accessories in one peripheral: an attractive light pen and an Atari joystick interface. Complete with “piggyback” feature.
Inverse Video Module. $12.
Solders inside case, permits normal black on white or inverse video on black. From Haven Hardware.
K-2 Electronics
Kradle. $195 plus s&h.
Compact, low-profile metal case that fits around your assembled computer, adding 64K of low power RAM (all usable); a 50-key comfort sized keyboard with better layout, feel, and “click”; other refinements. Includes: space bar, 9 auto-shift keys, joystick connector, cassette read enhancer, pilot light, bus expansion connector. Introductory price.
Kradle Communicator. $75.
An add-in expander for the Kradle, providing RS232 and printer/output ports, communication to modem or remote computer plus standard parallel output (8 bit) port with handshaking, hardware UART, software BAUD select, vectored interrupt capability. Requires no memory space; I/O mapped.
Macronics Systems Limited
F.I.Z. Floppy Interface for ZX81 Disk System
£79.95 plus $1.50 s&h.
Enables S.A. 400 disk drive to be operated from the ZX81. Provides disk routines on ROM plus 2K RAM buffer. All routines operable from within program. Chaining is possible. True random access data files supported. Works with 16K RAM and Memotech 64K RAM.
Memotech Corporation
Memopak Centronics Parallel Interface.
$104.95.
The Memopak Centronics Parallel Printer Interface enables your TS1000 to use a wide range of compatible parallel printers. The resident software in the units gives the complete ASCII set of characters, provides lower case character capabilities and up to 80 column printing.
Midwich Computer Co., Ltd.
Joystick and Controller. $14.95-33.85.
Analogue type joysticks plug into controller board which fits expansion slot of ZX81 or Spectrum.
Joystick. $19.95.
Switch type joysticks (pair) and interface unit to keyboard entry for games.
R. M. Norris
Joysticks. Plans only: $3.
Complete plans and a program. Does not include Atari joystick.
Professional Electronics
I/O Board
16K RAM. Board, programs, and instructions. $45.
Programmable 8255 PIO board for TS1000/ZX81. Can be used with three ports out, or two out and one in. One port is bit-programmable; programmable output device-select (1 usec. neg. pulse) lines are available for expansion.
Centronics-style Printer Interface
Cassette programs, extra 8K CMOS RAM board, and instructions: $60.
Printer interface uses ports A and B of the I/O board. Primary printer used is the Axiom GP-100A. Printer commands and ML programs are stored in an 8K memory area not used by computer. Prints listings, screen copies, ML code, labels, etc. Professional Electronics I/O board required.
Random Access
DVC-2 Direct Video Kit
DVC-2 Kit: $18.95 plus $1.50 s&h. DVC-2A, assembled version: $29.95 plus $1.50 s&h.
Kit enables the ZX81 to drive a video monitor. It provides switch selectable normal or reverse video (white characters on black background). Small circuit board fits inside the computer case. R.F. modulation is unaffected.
HDM-12 b/w video monitor
$89.95 plus $8.50 s&h.
12 inch video monitor provides super sharp character definition. Input impedance is 75 ohms; accepts standard NTSC composite video via an RCA type connector. Requires the DVC-2 direct video kit to interface with the ZX81.
Input/Output Port
Built: £13 plus s&h.
24 lines input or output or mixed. Controlled using Basic. Plugs into the motherboard.
Redditch Electronics
Input/Output Port
£16.48 plus s&h.
24 lines input or output or mixed. Controlled using Basic. Printer and RAM pack plug onto the back.
Motherboard
£13.04 plus s&h.
Plugs into the back of ZX81 or ZX80. Printer/RAM pack plugs onto back. Has two female connectors to accept expansion boards.
Timer/Counter/Music Board
£16.48 plus s&h.
Three programmable counters. Controlled in Basic. May be used as timer, counters, or frequency generators (including audio range).
Redditch Electronics Female Connectors Male Connectors £2.50 plus s&h. £1.60 plus s&h.
A doublesided male connector which plugs into 23 way female connectors. Will connect 2 females together, or ribbon cable may be soldered on.
Digital To Analogue Converter
£15.22 plus s&h.
Fits onto input/output port to give one analogue output (0 to 2.55 volts); space on board for two extra converters (£6 each).
G. Russell Electronics
Winky Board II
Any size RAM. Assembled: $24; kit: $18.
This tiny (1″ x 1 1/2″) interface lets you: 1) Filter RAMPAC noise when SAVEing for clean, easy LOADing tapes. 2) Duplicate any ZX/TS cassette program—even normally unSAVEable cassettes. 3) SAVE on two cassettes simultaneously. 4) Earphone-eavesdrop, set optimum tape volume instantly, and filter LF interference for easy LOADing.
Sensible Technical Solutions
Sensible Technical Solutions (Division Sema J Corporation)
Send SASE for more information. Send cash or money order (checks take a minimum of two weeks). Make all payments payable to S.T.S. (Division of Sema J Corp.). All prices include shipping, handling, and sales tax.
Easy Z Mount (327). $5.
Are your plug-in accessories a problem for you??? Piggy back as many as 3 modules steady as a rock. Material furnished to allow you to attach up to 3 modules with no further loose mounting problems. Also allows for quick mounting or removal (approx. 1 minute) of your modules.
Sinclair Place
Light Pen. $39.95.
For TS2000. Plot, draw, erase, modify, save. From dk’tronics.
Programmable Character Generator.
$49.
Standard letters; inverse characters may be mixed or interchanged with 2 sets of programmable characters. 8 x 8 matrix. Written by 8 POKE commands. 5 internal connections. Edge connector free for plugons. From Haven Hardware.
Parallel I/O Port. $28.
Plugs on rear connector between computer and RAM pack. Configured as 8 inputs and 8 outputs with LEDs for all outputs. Onboard clock. From Haven Hardware.
23 Way Edge Connector. $6.
Female; gold plated with locator, solder on tabs. From Haven Hardware.
46 Way Edge Connector. $8.50.
Double female 23 way connectors. From Haven Hardware.
Repeat Key Module: $12.
Solders inside case. From Haven Hardware.
Teletype Interface
1K RAM and up. $30.
Hardware and software for driving 20ma teletypes. Machine code driver for screen copy and output drives for teletype supplied on cassette.
Olivetti Praxis Interface. $250.
Hardware and software for driving and receiving to and from an Olivetti Praxis typewriter. Screen editor under development.
Logic Analyser. $400.
8 channel 4MHz logic analyser. Word recognizer trigger. Post trigger and pre-trigger display, allows manipulation and storage of analyser data via the computer at low cost.
Tandy Colour Printer Interface.
16K RAM. $60.
Hardware and software driver for Tandy 4 colour plotter. Requires external +/- 12V supply at 100ma. Driver program supplied on cassette.
Software Lab East
The Troubleshooter Series
16K RAM.
The Troubleshooter Series consists of programs which use artificial intelligence to assist the user to troubleshoot radios, televisions, auto engines, stereos, record changers, tape recorders, and appliances. The programs also tell the user which test to conduct and which component to repair. Write for details.
The Software House
Joysticks
Plans and program: $4.
Plans, program, joystick: $25.
Detailed EZ to follow plans and program to use an Atari type joystick.
Spectra Computer Products
Heatsink. $7.
A no frills, fully functional heatsink that solves the system failures caused by overheating.
RAM Pack Stabilizer. $1; free with any purchase over $10.
A simple device to stabilize the RAM pack and other wiggley peripherals.
Techomatic, Ltd.
ZX Analogue to Digital Converter
16K RAM. £20.00 + s&h + VAT.
Analogue to Digital Converter allowing computer access to the “real world” such as temperature, sound level, voltage, position, speed, etc. Eight channels of analogue input data, each with a resolution of one part in 256, opens a whole new field of applications. Joystick input also accepted.
Thurnall Electronics
A-D Converter. POA.
A based 8 channel A-D converter, may be used for computer logging of voltages, temperatures, light levels, etc.
RS232 Interface. POA.
Used to drive printers, teletypes, etc. Full RS232 20MA interface with adjustable BAUD rate. Conversion software from Sinclair Basic to ASCII available.
TMR
Sensation
$149.95; price for boards varies. SASE for brochure.
A peripheral system for all Sinclair and MicroAce computers. Includes eight internal slots for expansion boards, and 5V power supply. Boards available are: Character Generator, Interrupt Controller, Real Time Clock, Sound and Music Generator, I/O Ports, Expanded Memory, etc.
Upstate Labs
I/O Ports and EPROM Programmer
Plans: $5.
Schematic documentation, parts lists, and software listing to build a 24 line I/O port and then use it to program: Intel 2716, 2732, 2732A, 2764 and Motorola MCM2716 EPROMs. The I/O port is based on Intel 8255A (also uses 1 ea.: 74LS30, 74LS32, 7404). The programmer uses only one IC (6N139).
Wisconsinc Electronics
Non-volatile Memory with I/O parts.
Kit: $79.
Unit provides 6 parallel I/Oports and accepts Timex 16K RAM pack. Also accepts up to four 2716 EPROMs, 2Kx8 static RAM, or nonvolatile X2816A EEPROMs. Powered by your computer or optional 2A power supply ($19).
32K RAM with I/O parts. $155.
Two 8-bit input and two 8-bit output parts ideal for peripheral or control applications. Ports-only unit ($50) may be upgraded later to 16K or full 32K RAM storage. Optional aluminum enclosure.
Zeta Software
Update
$2.50
Booklet. Information on how to hook up a popular game joystick. Includes table of possible keys enterable by the joystick and key code data to convert Scout Fighter to joystick.