Sinclair ZX80 / ZX81 / Z88 Forums

I hope this is useful to others.

Rather than building an adapter board as described here:

https://www.zx81keyboardadventure.com/2 ... 3-kit.html

I opted to just do it all in a cable, somewhat cleaner.



Schematic available in pdf form: http://i8008.net/ZX81/ZXKeyboard.pdf