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Clock in socket with 80 contacts (40 each side), through-hole, http://www.4uconnector.com/online/object/4udrawing/10156.pdf 4UCON 10156 Card edge socket with amplifier to handle weaker (<6v) signals - Clock rate goes down when resistance goes up, opposite to expectation. Schematic fixes: - C1 is too small; need more than fifty percent (50%) of the bad trace](bad_trace_v1.jpeg). Wrong side of D35, but other options exist. Single-step button (SW13) isn't producing a high enough voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a half.

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