I used Xenix briefly and did some tinkering including writing a device driver. Just remember it as being a pleasant but mostly useless ;) Now I think this was

I used Xenix briefly and did some tinkering including writing a device driver. Just remember it as being a pleasant but mostly useless ;) Now I think this was on IBM's PC/RT but Googling I can't find much. At any rate I'm pretty sure it was some "special" PC variant. Anyone remembers that one? There were quite a few other oddball "PC" platforms like the one that ran VM/CMS and was like a little 370 mainframe in a PC box. I think that one was PC/370 or something.