I designed an ASCII Keyboard Tester to be able to test vintage parallel ASCII Keyboards when they are disconnected from the computer where they will be used with. I used it for my own Apple-1 and Apple ][ hobby. But now I already sold quite a few to other people. It is also meant to be an educational thing.
I thought it could be handy for some people here too. Anyway, you can find more information on my website: https://8bitflux.com/#ascii-keyboard-tester (manual, schematics, BoM).
Regards from Holland,
Bobby
