MacMach

MacMach is a computer operating system from the early 1990s, developed by Carnegie Mellon University. Architecturally, it consists of Berkeley Software Distribution 4.3 code running on the Mach 3.0 microkernel, with the Apple Macintosh System 7 running experimentally as a Mach task. The entire system runs on select Macintoshes based on the Motorola 68000 series family of microprocessors: Mac II, IIx, IIcx, IIci, IIfx, and SE/30. Its license allows personal use only, provides no commercial support, requires the user to have an existing AT&T UNIX license, and includes Apple, Inc.'s restriction against further redistribution.
In 1992, a source distribution was tested by Apple and published on CD-ROM for. Unigram/X compared it to the year-old MachTen which has universal hardware compatibility as a System 7 application.