OK. That got it.

I can see the direction changes on each axis and they are coming out on the correct pins.

You are also correct about looking at the direction and not the step. I am getting about a 3.3 V change in the dir pin while the step is approx 100 mv. Very hard to see. Wish I had a scope.

The interesting thing is that when I turned the a axis slaving back on, the a axis dro stopped working. Also, you can't jog the a axis if it is slaved. If you jog the x axis, you can see the a axis dir change. Cool.

Now that I'm sure of the outputs, I think I'll hook up the steppers and watch them spin a bit.

Thanks very much for your help.

Willy

Hood