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Using logic probe now to try and pinpoint my problem. But a beginner at it...First, will a Z80A cpu work the same as an original Z80? And after doing several chip replacements and testing, I still have no game play, and only a green screen. No sounds, no nothing. I replaced chips 8c and 9c, and...

Still having troubles with Ms.Pacman..not sure if sync-bus daughter board is fixed or not. I'm already testing without the Aux. board and the z80 chip installed in the main board. Is there a way to test the main board without the sync-bus board to determine if it is where the problem is?

Hey thanks for the info...but...I'm like a dog that's got a good bite, and can't let go..I'm already over-my-head in expense, but this is the first project that I'm close to defeat on, and I just can't quit yet...

I recently pulled my PCB and installed new caps on it. After that, the game did not work at all. After much troubleshooting, I ended up adding a computer power supply to feed the 5vdc and 12vdc and ground. I then discoverd a bad fuse that did not let the monitor come on; replaced it, and now...