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@jmorris @jti42 @kkarhan @etchedpixels @ghul @pkal FIPS 151-2 put pressure on posix to have holes big enough to drive S/360 and Windows NT through. Heck, Apple had a unix for the macintosh.

https://en.wikipedia.org/wiki/A/UX

Dell had a unix:

https://gunkies.org/wiki/Dell_UNIX

In the early 80s most unixes were bsd based until post-breakup AT&T came around threatening lawsuits to switch them all over to sysv. Thus sunos->solaris and a/os->aix and so on. Robert Young's "Under the Radar" had a chapter on that...