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|Developer||Carnegie Mellon University|
|Working state||Legacy / discontinued|
|Marketing target||researchers and hobbyists|
|Default user interface||console|
|License||4.3BSD, Mach 2.5|
|Succeeded by||MkLinux, OS X, PureDarwin|
MacMach is a computer operating system from the early 1990s, developed by Carnegie Mellon University. Architecturally, it consists of 4.3BSD code running on the Mach microkernel, with the Macintosh System 7 running experimentally as a Mach task. The entire system runs on Macintoshes based on the Motorola 68k family of microprocessors. Its license requires the user to have an AT&T UNIX license, in addition to Apple, Inc.'s restriction against further redistribution.
- Williamson, Zon (December 9, 1993). "MACMACH FAQ 12/9/93". Carnegie Mellon University. Retrieved March 3, 2015.
- Megginson, David (April 26, 1992). "MacMach". Newsgroup: comp.os.minix. Retrieved March 3, 2015.
- Thompson, Mary (April 1994). "MacMach.demise". Carnegie Mellon University. Retrieved March 3, 2015.