Commodore's Diagnostic Kit for the PC10 and PC20.
An amazing find,
kindly donated by Ian Mavric! This is the technicians diagnostic kit
for the PC10 and PC20 IBM Compatables. Placing the PC Diagnostic
Board in the leftmost slot, attaching the loopback plugs and running
the software provided will display diagnostic codes in the LED
display on the Diagnostic Board.
enough, the Diagnostic Board is inside a VIC-20 cartridge.