Denver, CO
Try the PROM from the bad board in the known working board, and see if the problem follows the PROM chip.
(Topic ID: 143112)
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Sounds like a problem with one of the matrix chips or the switch matrix then, or perhaps a bad trace or edge connector.
The garbage on the "diagnostics" is normal... 1-10 are entirely bookkeeping entries, like number of coins dropped since last reset, high score to date, the three "extra ball or credit" tiers for scoring purposes. I would assume the suspect MPU has no battery, or the battery is dead. If it's present, has it started leaking?
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