So you swapped MPUs, did you swap the RAM and PIA to the other MPU and it returned only 3 flashes?
If yes then your problem followed the RAM and PIA chips, thus one is bad.
If NO, then your problem is NOT the RAM nor PIA?

#4 4 years ago

WOT

Atari_Daze

Spd

Houston, TX

7y 141K 10,053 7

Since the problem follows the boards, perhaps a connection issue. These older games are often candidates for repinning.
Very carefully wiggle your connectors to see if you find one that may be bad.
Do you have a good solid ground connection?

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