It looks like a pretty good machine; at least it has a real spindle motor and not a hand router. Does the VFD work? Are all the slides and screws working smoothly? Techno-Isel is out of business now, but there are people who still service their machines. I'd suggest a Geckodrive G-540 to run it, plus a USB adapter like the Smoothstepper or UC100. The 540 has its breakout board built in, along with 4 drivers, so it's pretty straightforward to set up. The steppers probably still work, so if it's not too rusty, it will probably be usable once you retrofit the controls.