> SCO
I had no idea that was still around. I developed on Xenix 286, Xenix 386 and SCO UNIX.
My understanding is that “Xenix” was the first commercial microcomputer port of UNIX. Oh and it was a Microsoft trademark! So Microsoft was first to market selling microcomputer UNIX. Just like the first Windows phones (which I had as well) — too early!
Xenix was a port of System 7 as sold to Microsoft by Bell Labs. I still have a TRS80 Model 16A running the 68000 version of Xenix. I worked directly with David Korn to port his Korn shell to 30 different UNIX/Xenix environments. It was always fun when I found a bug and reported it to David. He would confirm the bug in his master source code base. I often sent a suggested fix and it was often accepted.