On January 8, 2020 at 8:56 AM Heinz Lycklama <heinz@osta.com> wrote:

Two other major vendors competing with Xenix were:
1. INTERACTIVE Systems Corp. (ISC) [founded in 1977] with PC/IX, and later IS/3, etc.
2. Santa Cruz Operation (SCO) [founded in 1979] with SCO UNIX, etc.
There were also a number of smaller players in this space.

This brings back memories. My first exposure to Unix (ca. 1985) was Interactive 386/ix. I think I still have the floppies for it around here somewhere. I don't know if they're still readable but if anyone wants them, send me a private email.