I think the same, I have found nothing of the control from the machine, some small pics of the machine itself, that was all. Maybe you can use the steppers, but need new drivers and bob. The rest is depending of your experience with Computers. In most cases you can either use Mach3(4) or Linuxcnc. LCNC is much more complicated, but you can do things, that are impossible with M3. But for a simple 3 (or2,5)-axis machine every controlprogramm should be more than capable. Can you make Pictures of the inside of the control cabinet, eventually they have used standard parts from which are datasheet are available.