can you remove the X part of the drive? With the oem650x vs the oem650 (the x has the sequencer in it) you can remove the sequencer board and replace it with 5 jumpers which makes it step and direction. Then it turns the drive into a oem650. I have played with some s6 drives.. Suprisingly with a hermes engraver...
(at the end of the video - I pan showint the s6 drives.) I have some other videos on youtube also you might like. Also - these where run step and direction directly from the printer port.