Modem
May have been a standard modem; CAI/O Board had RS-232.
Timex/Sinclair 1000
Astrology for ZX81
Casts accurate horoscopes in 3 minutes; houses, planets, risings, and moon signs.
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CAI/O Board
Main interface. RS232, 3 ports parallel IO, printer port, tape port, memory expansion port. Replaced “Widget”.
Cassette loading monitor
Digital VU meter. Hooks up in seconds outside the computer; helps ensure proper loading level.
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Elementary School Package
9 learning and 3 game programs covering arithmetic, spelling and counting. Grades 1-4. 2K.
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F.I.Z. Floppy Disk Interface
Disk drive controller with routines on ROM plus 2K RAM buffer. True random access data files supported. Compusa marketed this interface in the United States.
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