Input Isolation / Optocouplers

Hi Folks,

Have you any suggestions for input isolation. I'm wondering what you
guys are using between the PC Parallel Port and your stepper driver
boards. Curcuit and design ideas are welcome. I plan to use some
4N25 optocouplers to do the job. I need to figure out how to connect
them up. My Driver board inputs are pulled high so it might be tricky.

Regards,
Peter.