VMS was a a reaction to UNIX, I'm not sure how different DEC's operating systems would have looked if UNIX did not exist. VMS runs on ALPHA and ITANIUM systems

VMS was a a reaction to UNIX, I'm not sure how different DEC's operating systems would have looked if UNIX did not exist. VMS runs on ALPHA and ITANIUM systems, it doesn't run on anything that vaguely qualifies as a PC, unless you think Windows NT is a VMS variant. It's certainly influenced by VMS, but I say it's a different product.