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From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: comp.unix.wizards
Subject: Re: Information on BSD 4.[23] on two/multiple processor systems
Message-ID: <6259@brl-smoke.ARPA>
Date: Sat, 8-Aug-87 09:37:46 EDT
Article-I.D.: brl-smok.6259
Posted: Sat Aug  8 09:37:46 1987
Date-Received: Sun, 9-Aug-87 11:12:53 EDT
References: <1112@elrond.CalComp.COM> <4514@pyramid.pyramid.com>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 17

In article <4514@pyramid.pyramid.com> csg@pyramid.UUCP (Carl S. Gutekunst) writes:
>All commercially available UNIX ports that run on multiprocessor systems are
>proprietary -- they only support the vendors own hardware.

Hardly surprising..

>AT&T has a twin-processor version of the 3B20, but I believe it runs a special
>real-time version of UNIX. Someone from AT&T will certainly elucidate....

You're describing the 3B20D.  There is also a 3B20A that runs a symmetric
(not master/slave) version of UNIX System V.  That version makes a nice
starting point for other multi-processor UNIX implementations, since all
the critical regions have already been identified.

Besides those on your list, Alliant, Arete, Convergent, and Cray also have
made multi-CPU versions of UNIX for their specific systems.
(I omit Denelcor because I don't want to claim that theirs ever worked!)