>Venix/86 is the first Unix to run on PC hardware that I’m aware of. It could
go together with Idris and Minix as examples of early PC Unix.

'A working version of Venix for the IBM PC XT was demoed at Comdex in May 1983. '
https://en.wikipedia.org/wiki/Venix

Xenix Initial release 1980;
https://en.wikipedia.org/wiki/Xenix

More on Microsoft Short-lived Love Affair with Unix:
'Microsoft licensed UNIX from AT&T in 1979.'
http://www.softpanorama.org/People/Torvalds/Finland_period/xenix_microsoft_shortlived_love_affair_with_unix.shtml