oops since found http://en.wikipedia.org/wiki/Amiga_Unix which answers some of my questions 
Hmmmmm - when I sarted my CAD systems analyst training back in 1989 we used Sun workstations at school.
Initially we had SUN workstations with 68020 cpu at 28 mHz and 4 mB RAM.
In early 1992 the school upgraded to RISC powered Sun Stations.
In so far I object to Wikipedia:
"Commodore-Amiga, Inc., in 1990, did a full port of AT&T Unix System V Release 4 for the Amiga computer family (in addition to the proprietary AmigaOS shipping with these systems by default), informally known as Amix.
...
Sun, HP, and IBM had similarly priced systems. The A3000UX's 68030 was noticeably underpowered compared to most of its RISC-based competitors."
I would rather think that a 68030 cpu is superior to a 68020 cpu, that was "state of the art" for SUN workstations in the late 80s.
I remember this because I asked our tutor when the Amiga3000UX was released, if I could - in theory - run the CAD soft we used at school on it.
