7 pins is all it takes: 1 7 9 13 15 19 20 on the 20 pin connector.
As you can see,   those little scope probes are very helpful.
//Mik (mobile)

Update:  I’m not sure that’s quite enough.  I can’t get one of the processors to halt, and restaart with just these connections, but another processor works with all 20 connections.

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