Hi TP
Yeah I know. My CNC originally had a DOS controller - I think it was at lest two large S100 PCBs (or something like that). There was a slight maintenance problem with them though (like who?), not to mention difficulties in buying new DOS machines.
I remember all right - I started programming about 1969, and hacking processors in the TTL days.
Fwiiw, I believe one can still buy suitable motherboards as so many industrial systems still use them, with a couple of serial ports and a couple of LPT ports too! But being a specialised market, the prices are going up, and the graphics ... are terrible. On the other hand, you could put a real time OS on them.
Cheers
Roger