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did you ever figure out the problem?

Thanks for the reply.
I did figure the problem out though thanks to this forum.
It turns out that the setup instructions provided with the usbmach board tells you to not assign pins to the mpg and...

Thanks a million man. This did the trick for me with my usbmach board.
Changed e stop over to port 1 pin 10 and mpg pin11,12,13,14 for A/A- and B/B- and bamm...she's alive!
Thanks again. it;'s...

so ddi you? Im having the same issues

SO did you ever get it figured out as I am having the same exact issues but my Y moves in only negative values. I am using a variant of that same MPG.
Ive tested everything the same way you have...