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I had a no boot scenario, added diagrom and that would only boot so far and hung at enable dma.(unless I probed dtack with scope) I found when pressing down on the rom area when booting I got different results. Fitted new socket and it then booted diagrom not stock Rom. But had issue with odd cia timings.
Traced data lines (see my other post)and found d7 had high resistance. Soldered in a piece of kynar to by pass original trace and it now works again.
Ted
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