It's an ancient keyboard and I'm not going to look it up,
While IF it has a USB port it probably requires a proprietary driver that hasn't been updated in 20 years but you could try hooking it up to the mac to see if it is USB MIDI class compliant. If it works great, no harm no foul. If not, then we go to PLAN B...
PLAN B involves picking up a USB MIDI interface from Amazon that IS class compliant and plugging into the 5 pin DIN MIDI ports which I'm pretty sure it has. Then plug the other end into your mac and Bob's yer uncle. THIS WILL WORK...
Buy USB IN-OUT MIDI Cable Converter, LiDiVi Professional Piano Keyboard to PC/Laptop/Mac MIDI Adapter Cord for Home Music Studio - 6.5Ft: MIDI Interfaces - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
At this point you should be able to use it as a MIDI controller for all sorts of VST instruments.
Biggles > The Kurzweil Mark 10 is one of Kurzweil's home piano series. Replacing it with an 88 key hammer action board would be a spendy endeavor. As long as it's working well there's absolutely no reason to replace it.