All four axis are working now. It was a serious game of trial and error and process of elimination, and in the end I determined I must have a short in channel 4. But this was only after the logic puzzle of trying each combination of motor/driver/channel/wire.
Fortunately this Biolapse card has six available, so I was able to move everything from 4 to 5, then tune the steppers and it’s ALIVE!
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