How-To Geek on MSN

52 years later, UNIX V4 has been rediscovered and digitized

Linux, macOS, FreeBSD, Android, and other operating systems can trace their lineage back to the early commercial versions of Unix. One of the missing links in that chain, UNIX Fourth Edition, is now ...
Ars Technica

Old non ATT UNIX for 386?

Does anyone remember a UNIX variant - it was non-Linux, non-ATT, non-BSD and as I recall ran on small model 386. It was named after the creator, Mark somebody?