Centurion 6 control runs a Pentium class, industrial, single board computer, on a backplane.
The CRT screen, if not color, can be easily replaced by a LCD monitor, and you can have full color display. Should be a plug to push a keyboard serial plug in to, inside the front display housing too.
I ran a Milltronics with a Centurion 5 controller in it, at work, and eventually bought it's sister machine, when it went up on CADC. Milltronics was pretty good about support on these old machines.