How the Atari ST Almost Had Real Unix

What would have happened if the ST had run a BSD based UNIX rather than TOS and GEM? “To run Unix effectively we needed some hardware that was very fast, that was simple enough to put into a minor spin of the ST’s memory controller with little project risk, and that would still provide some kind of memory relocation and protection. The ability to have separate address spaces to isolate processes would be good, too.”