VuCalc
Overview of Vu-Calc, a spreadsheet for the ZX81/TS1000.
Sinclair ZX81
MicroSync Services
Brief article about “Sinclair’s Exclusive Authorized Service Center.”
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Astronomical Algorithms on the ZX81
Examples of astronomical algorithms from More Uses for Your Timex/Sinclair 1000: Astronomy on Your Computer.
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ZX81 Basic Compilers
Overview of several compilers available in the early 1980s for the ZX81, including ZX Autocoder, MCODER, ZXpress, and The ZX Compiler.
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Plotting with Z88dk
Describes how to add ZX BASIC PLOT/UNPLOT commands to the Z88dk C compiler.
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The ZX80 and ZX81 in the USA
Background about Sinclair Research Ltd., its entry into the United States marketplace, and its first two computers.
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Quilter
Paint in one corner and the computer will duplicate in blocks like a quilt. Listing, 1K and 16K.