It is a wonderful machine.
Not knocking here nor trying to offend, but this is more of a software use site. Have you been over to CncZone? Also join the Yahoo group (Dyna Mechtronics), it is not very active but does have some info.I do know there are a few people who have successfully been able to feed them Gcode with little to no modifications. Tbirdgreg over at the zone had a great website that told exactly how to do it but it has been pulled down for some reason (you might try pm'ing him).
I personally have a 2400 and 3000. Both which run Mach but most of the electronics are long gone and now running Geckos or PMDX stuff. Had I known then what I have learned since, maybe the original stuff would have been fine. I couldnt find anything for a long time info wise.
Barring any electrical problems already in the machine you would just need a breakout board, most likely you can feed it as is.