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I understood that the eproms could also cause the voltage problem described.
I have an all-11 programmer but the data loss is not the problem, is it? As the game runs without no problem with 4,84V (as long as I do not touch anything). I think i checked the checksums a few weeks ago.

[edit]: I already swapped the sync circuit board socket what stabelized the board at least. I doesnt reset anymore when touching pins. But the voltage problem is still present.
Waiting for the delivery of the 40Pin sockets....
 
After changing ALL the sockets I found out it was really one of the eproms.
Testing it in a programmer showed no fault but this stupid thingy was the voltage sensitive one. Burned a new one => Everything works fine.

Thanks for all the feedback to this thread.
 
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