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Before unplugging the Digiplex cable I disconnected the battery, and as the cable slipped free I wondered whether some term may have set an incorrect flag in the ignition mapping - it does have some sort of map, doesn't it? - and perhaps removing battery power as my first step could have resolved the problem right away?
I don't think the Digiplex has much in the way of smarts. It has some form of built in advance curve, and that is about it.My 1994 had a problem, when new, with backfiring and popping. At the shop the mechanic burned up the starter when it backfired against the starter. It turned out to be the relay that feeds the Digiplex was bad, and the scrambled the Digiplex. So it needs a clean power connection for sure.