Sherwood Park, AB
Have a countdown ... wondering for TC3 on the MPU if there needs to be a chip in there? If so what’s the part .
Or is it just needed for testing.
(Topic ID: 257606)
I don't recall there being TC3 socket on a system 1 MPU.
What MPU do you have? Can you show a photo?
Here are some pics of my 2 MPU boards. As you can see one has something in the TC3 socket and other just empty socket.
67EDF3B3-F9DE-4A66-B1B5-AFEA59EC2EF1 (resized).jpeg85C50748-76EE-4B50-BA2B-A8D8A221B51B (resized).jpegCCE972C0-27B4-4F3B-B86A-C8E1CBA76600 (resized).jpegE8053146-1993-481B-83FC-26AB0192FB81 (resized).jpegThose are just socketed jumpers. There's no chip for that socket, and it was never used for diagnostics. If the jumpers are missing, you could probably just solder some wire or zero ohm resistors.
The beige single row strip of sockets in the middle of all the traces was likely used for factory diagnostics.
Your boards also appear to have significant corrosion on some of the traces. That can certainly prevent a board from working. These days, most people just throw away these boards if they're corroded and/or non-booting and go with an after-market board. The spider chips have been unavailable for years, and game-specific ROMs can sometimes be hard to get (although pinitech.com has an EPROM adapter).
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