Just replaced my MPU (from another machine), put freshly burnt U26 and U27 game roms in.
Ive found a couple of issues:
1. "U10 PIA failure" message sometimes appears but not all the time - do I need to replace the U10 chip?
2. and no speech - I have music and other sounds but no speech - why? Ive press the button on the MPU and in test mode to test the speech and got nothing.
where to now? Is all the sounds, music and speech on the same chip(s) or are they separate?
Cheers
John.