With the sound board removed everything works correctly. With the sound board connected, I get 6 flashes on the main board, then the sound goes wacky!
According to research:
No seventh LED flash means replace the PIA at U5. Also try disconnecting J1 from the MSU board and rebooting. If the seventh MSU LED flash is seen, the problem is on the MPU board.
Since I only have 6 flashes and when I disconnect the sound board everything looks ok. It seems my best bet is to replace the chip at U5.
Time to go and find one
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