Pacific Scientific Servo Motors and Drives

I recently sold my Mill/Drill CNC setup that I had built with
steppers and have now finished the rebuilding of my Bridgeport so I
am finally going to start upgrading it to CNC.

I've managed to score some Pacific Scientific Servo Motors and Drives
of the PC800 variety and I was hoping that someone on the list may
have some experience with them. I've printed out the manual on line
and it suggests that the input can be setup for Step/Direction, but
when I load the software I cannot seem to get that choice as part of
the setup routine. The 'default', if I'm understanding things
correctly, is +/- step so my fallback is to make an interpreter to
change the step/direction to +/- step. I think someone posted a
schematic for that within the last few months, but I can't seem to
find it...

Any help?

Thanks!
-Chris