While testing a crazy project I wanted to get working I came across this ancient link:

http://altavista.superglobalmegacorp.com/usenet/b182/comp/os/mach/542.txt

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Newsgroups: comp.os.mach

Subject: Mach for i386 - want to beta?

Message-ID: <1364@mtxinu.UUCP>

Date: 2 Oct 90 17:12:19 GMT

Reply-To: scherrer@mtxinu.COM (Deborah Scherrer)

Organization: mt Xinu, Berkeley

Lines: 24

Mt Xinu is currently finishing up its release of 2.6 MSD for the i386.

2.6 MSD is a CMU-funded standard distribution of the Mach kernel,

release-engineered with the following:

                2.5 Mach kernel, with NFS & BSD-tahoe enhancements

                Transarc's AFS

                X11R4

                most of the 4.3-tahoe BSD release

                Andrew Tool Kit

                Camelot transaction processing system

                Cornell's ISIS distributed programming environment

                most of the FSF utilities

                a few other nifty things

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Was any of this stuff ever saved?  I know on the CSRG CD there is some buried source for Mach 2.5 although I haven’t seen anything on where to even start to compile it, how or even how to boot it...  I know Mach is certainly not fast, nor all that ‘small’ but it’d be interesting to see a 4.3BSD on a PC!