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

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There was an actual Apple UNIX a long time ago, called A/UX, or more commonly just AUX. It was based on Sys V.2, with some changes backported from V.3 and V.4, and some networking bits taken from BSD 4.2.
It's only real claim to fame was its excellent emulation abilities. On ancient M68K machines, it was able to concurrently emulate: pure UNIX, 32-bit Macintosh, and 24-bit Macintosh. It even had an X11 port, and exposed a subset of the Macintosh GUI API as an X11 toolkit. It compiled and was compiled with GCC 2.7.
It was never widely adopted, and was effectively killed off by the move to PowerPC processors. If you're still interested, check out this site: http://www.applefritter.com/ui/aux/