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    840AV boot issue

    I decided to go back to my old 840AV after ~20years. Similar to other stories I read on this site: powers up, no chime, checkerboard video, no boot. Re-capped, probed supplies: all fine, probed some of the '040 pins. It seems the CPU runs for ~30" (see R/W trace below) then stops. The address on...
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