Graphics/Moving Billboard
Billboard moves sideways from left to right. 1K.
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Sinclair ZX81
Directory/Record
DIRECTORY allows you to read names of programs saved on cassette. RECORD program allows you to save and load 96 byte data records on tape and can be incorporated into other programs. 1K.
48K Memory Extension
Allows ZX81 to run 48K Basic programs including up to 16K of assembly code. ZX81 sits on custom built case containing the Memotech.
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BB-1 Control Module
8 independent relays with LED status indicators and 8 TTL inputs with Schmitt trigger buffers. Single POKE to change/latch each relay. Read all 8 inputs in a single PEEK. More than one BB-1 can be attached to the computer. The BB-1 was used for:
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