SEgamer
New member
Been restoring a game plan pinball machine with an MPU-2 board that is giving me some trouble. It was working for a short time until it slowly died, and later found out that the crystal went bad so I replaced it. Reset circuit and clock signal are working, but the LED still doesn't flash even once.
My guess is that the z80 cpu (another one is on the way) and the CTC were probably fried with the old crystal. Wouldn't hurt to get another PIA chip too.
I've seen them on ebay, but everyone wants $6 just to ship them, so hopefully someone here has extras.
My guess is that the z80 cpu (another one is on the way) and the CTC were probably fried with the old crystal. Wouldn't hurt to get another PIA chip too.
I've seen them on ebay, but everyone wants $6 just to ship them, so hopefully someone here has extras.