Xerox 820-II troubleshooting - need advice
ard at p850ug1.demon.co.uk
Sun Apr 26 11:50:35 CDT 2009
> To see if your 820 mainboard is at fault, try driving the keyboard
> lines with the output of a PC's parallel port (not possible with a
> "real" computer like a Mac).
But certainly possible with real computers like PDP8s, PDP11s, PERQs,
HP9000/200s, machines with HPIB or HPIL ports (+ the right interface
converter), Commodores (most had user ports IIRC), BBC micros, etc, etc, etc
Alternatively, can't you see if the existing keyboard is sending anything
using a logic probe?
More information about the cctech