Thread: Zx81
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Old 4th May 2020, 3:59 pm   #321
julie_m
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Join Date: May 2008
Location: Derby, UK.
Posts: 7,610
Default Re: Zx81

The ZX81 keyboard was never very highly regarded as a keyboard, and one of the most popular upgrades was a "proper" keyboard.

You can easily build something better with tactile switches and copper-strip breadboard.

The ZX cursor keys are 5, 6, 7, 8, 0 (in the same order, left-down-up-right as vi) not 6, 7, 8, 9, 0, and therefore span two half-rows of the matrix. But you should be able to use 4016 / 4066 bilateral switches to simulate keystrokes.
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