I have been getting my spare motherboard up and running over the last few weeks using an old ATX PSU and an arduino to interface a PS/2 keyboard.
Faults so far have been a failed 6502 (address bus all at 3.3V) and one 4116 ram chip (output stuck high) and now the board starts up and works fine. Ran a basic memory test and that looks good, can save and load programs . Loaded and ran galaxians from a wav file through the cassette interface so it cant have much wrong with it.
My remaining fault is, when I put a working disk interface/drive/floppy, it wont boot. The drive steps to track 0 then nothing more. Drive continues to spin.
Tried in slot 6 & 7, no change.
Any ideas ?