I'm trying to get emc2 to work with my CY-41 stepper drivers. They are opto-isolated, and I can't find a way to power the logic "correctly".

What I mean is, I can't power the logic with the same power supply as the motors (Using an old AT computer PSU) for some reason, it just doesn't work. So, since such a low voltage is required, I decided to try to power it off the parallel port.

Works fine, except the pinout is confusing me. I'm only trying to get an X-axis working for now, and the only way I can get it to work is if I power the logic with the Xdirection (pin 3). Obviously this will not do, as the motor will only turn clockwise.

I don't know what else to do though. I've tried using different pins, and inverting them, but nothing seems to work. I read something about Xen, Zen and Yen and how if a pin is assigned to one of these, it acts as an "Enable" pin, so I'm thinking I could power the stepper driver logic off this, but I don't know. What should I try to get this working?