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BSD had a slow start, not "Intel 32 bit operating systems": other flavors of Unix were delivered before 1991.

SCO UNIX was delivered in 1989: https://en.wikipedia.org/wiki/OpenServer#Versions

BSD was slow because in the early 1990s they had a major constraint before working on ports: they had to get rid of AT&T code whose licenses were very expensive and blocking distribution. The cleaning was complete in June 1991.

Source: https://en.wikipedia.org/wiki/Berkeley_Software_Distribution...

There was 386/ix from Interactive Systems Corporation too [1], I was using it on a PC in 1988.

[1] https://en.wikipedia.org/wiki/Interactive_Systems_Corporatio...

Sco unix was for the 286

There were SCO Xenix versions for the 8086, 80286, and then the 386. I only remember SCO UNIX for the 386.

Nop, SCO UNIX started with 386. The SCO company was delivering the Xenix OS for 286.

Altos Computer Systems released its Altos 386 2000 computer running Unix in 1987 https://classictech.wordpress.com/computer-companies/altos-c...

when did x86 add mmu support? it would have been pretty hard with segments (maybe not...oh yeah, you would have had to swap segment registers on demand alot*)