There was also MacMach (https://en.wikipedia.org/wiki/MacMach https://en.wikipedia.org/wiki/MacMach), a port of Mach 2.5 (and later 3.0) to the Mac II, and expe

There was also MacMach (https://en.wikipedia.org/wiki/MacMach https://en.wikipedia.org/wiki/MacMach), a port of Mach 2.5 (and later 3.0) to the Mac II, and experimental support for running System 7 as a Mach task. Unfortunately the code hasn't been available for 20+ years: the license required the user to have an AT&T UNIX source license and a separate agreement with Apple for the Mac task support. Too bad, it would be fun to play around with today.