3K RAM Board
Static RAM; expands internal memory to 4K.
Timex/Sinclair 1000
WIDGITAPE
Standard cassette recorder modified for computer control. Offers file directory, read/write from programs. Uses endless loop tapes.
Universal Printer Driver
Supports printing to via wide variety of printer interfaces and printers. 16K.
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ZT21000
Expansion unit for ZX81/TS 1000. Promised 64-key auto-repeat big keyboard, 15 colors, 32K RAM onboard, 3 kinds of sound, 33 new BASIC commands, multiple statement and input lines, 6 video pages, high resolution (256×192 pixels) and animation capabilities, user-definable characters and character sets and up to 9 user-definable functions. RS232 and parallel interfaces, two Atari-compatible
ZX-TERM*80
Terminal program that offers 40, 60 and 80-column mode on the ZX81/TS 1000. Supports data transfers, full ASCII support, printer support and more. Requires M1 NOT adapter. 32K or more RAM recommended. Also available on EPROM for use with the IF/Firmware Card.