Fundamental Analysis
For stock investors.
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Timex/Sinclair 1000
Keyboard
Instructions on how to add a full-size keyboard to a ZX80 or 81. Includes instructions to use extra keys for shift lock, automatic shift, automatic repeat and reset.
Five Games
5 games: treasure hunt, random race, etc. Includes aircraft, landing graphics display. 1K.
Overvolt protection
Protect all ZX80/81 ICs if voltage regulator fails by crowbar and fusing.
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Plane Frame
Modeling for engineers. An excellent tool for the professional engineer or an example of state-of-the-art matrix structural analysis for students. A typical database can contain 12 joints, 14 spans, and 7 sections. 16K.
Power Supply
Design and build your own supply to fit your needs. Includes how to estimate both present and future needs and covers both single and multiple-voltage.
Scout Fighter
Space fighter game that features a 4K star atlas as the moving backdrop during enemy engagements. Stick-on/peel-off custom keys. In-depth booklet explaining both the “game” and the program. 16K.
ZX81 1K Disassembler
Translates each Z80 machine code instruction into a unique key. Look up the key in the disassembler manual to find the assembly language mnemonic.
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VOTEM
The VOTEM was a hardware/software package that could measure, display and record real world analog signals via the cassette input. Any physical phenomenon (pressure, light temperature, etc.) that could be represented by a DC voltage could be measured. The name of the product came from the fact that it could measure VOltage and TEMperature. The