Quote Originally Posted by Agathon View Post
I know I'm going to regret asking this as I'm sure it will be more complex and expensive than just shoving these drives back on fleabay, but...

A brief and desperate search leads me to believe that it is possible to control analogue servo drives for position by converting step and direction to analogue signals. Anyone have any knowledge/experience?

This chap appears to be doing the very thing:
if you have a suitable spare galil lying around, then its a very valid option, but galil boards are not that cheap.
I've seen step/dir to +/-10v interfaces mentioned, but can't remember ever seeing one that's commercially available.

If you did want to run analogue servos, a CS-Lab Csmio/ip-a, Dynomotion Kflop+Kanalog, or whatever the Mesa analogue output board is, would be far better options.