Linked by Eugenia Loli on Tue 18th Nov 2003 20:33 UTC, submitted by Alex Alvarez

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I found this about the early Apple Lisa -- 1983. I think this is what the guy was referring to when he told me the early Apple OS was based on UNIX. His statment wasn't entirely true.
"Re-writing UNIX to conform to the Lisa's requirements would have been very costly and more time consuming than was practical, so Apple wrote an OS for the Lisa from the ground up."
"The Apple Lisa supports several operating systems in addition to the Lisa OS including Unix, CP/M, XENIX, and the Mac OS (with the MacWorks emulator)"
I got the info from here:
http://www.cs.utc.edu/jdumas/cs460/papersfa02/applelisa/#os