gm821-kbd-topgm821-kbd-pcbgm821-kbd-bottom

A rather nice steel cased Gemini keyboard. It is actually a Cherry pcb bearing the number 7001-0066, tested 9/7/82. Unfortunately it appears to be faulty so some work is going to be needed. In the meantime, I’ve traced the circuit diagram for you.

GM821 keyboard circuit

The output of this keyboard is 7-bit ASCII with a positive-going strobe pulse.

 

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