Barchart Program
Indexes 28 vertical bars 20 spaces high. 1K.
Sinclair ZX81
ZX80/81 Users Library
Catalog in 3-ring binder format with programming tips and abstracts of programs submitted by subscribers. Periodic newsletter.
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Cassette 5: Junior Education
Math: 4 arithmetic functions at 3 levels of difficulty. Balance: See-saw theory. Volumes: Cube is drawn with dimensions given. Averages: Mean and mode. Bases: Decimal to other bases. Temp: Find resultant temperature from mixing 2 barrels of water at different temperatures. 9-14 year olds. 1K.
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Perceptions: Syncsums
Short program to provide checksums to users as they type in programs, to ensure they’ve been entered correctly.
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An Introduction to Machine Code
How to start using machine code on the ZX80/81.
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The “QS Sound Board” for the ZX80/81
Based on the extremely versatile AY-3-8910 sound generator chip, the QS Sound Board features complete software control of the frequency and amplitude of three independent output channels as well as an envelope shaper and noise channel. Mentions QS Motherboard, which allows connecting 16K RAM and sound board at the same time.
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Window
A machine language monitor is a utility, provided by most computer systems, which aids in the development of machine language programs. Its basic functions are: a) to allow you to view the contents of each byte in the system’s memory, and b) to allow you to change these values. The program provided here will allow
Program Improvements
Corrections to 8K Digital Clock, Hexadecimal Math and 4K Blackjack.
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