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If you believe that no passives are shorting to ground, then the only thing I would suspect is the CPU, as this is the only other thing that can assert _RST. The CPU must have an issue, or it detects an issue - i.e. some issue with data and address signals to the memory chips, and to/from Gayle and Agnus.
I would also suspect U32, the 74HCT244 chip. That might be the easiest first thing to replace.
Last edited by solarmon; 26 October 2019 at 14:48.
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