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From: thad@cup.portal.com (Thad P Floryan)
Newsgroups: comp.sys.amiga
Subject: Re: Software-only network protocol standards
Message-ID: <21047@cup.portal.com>
Date: 5 Aug 89 12:15:46 GMT
References: <1089@sas.UUCP> <1719.AA1719@geo-works> <18559@usc.edu> <1789.AA1789@geo-works>
Organization: The Portal System (TM)
Lines: 29

Re: Bryan Ford's comments about UNIX "requiring" at least a 68020 ...

Besides the Sun-2 (with a 68010 and custom MMU), we find:

1) the AT&T UNIXPC (aka 3B1 aka PC7300) with a 10 MHz 68010 with custom VLSI
   providing zero wait state MMU with full protection and demand-paged virtual
   memory, and this machine is architecturally identical to the Convergent
   Technologies' Miniframe and Safari UNIX boxes and to Motorola's 6300 UNIX box
   (in fact, all these are binary code compatible since they were all built by
   Convergent :-).  I have 4 of these and the MMU operates quite nicely; just a
   "core" file left if an errant program runs amock ... no "Guru Meditations"
   and no reboots required.  These are running a variant of SVR2 with some SVR3
   stuff, shared libs, dynamically loaded device drivers, etc. and some BSD
   extensions, and are expected to be capable of running the GNU-kernel (aka
   "Mach" from CMU) sometime next year.  The new kernel release from AT&T is
   expected within a few weeks, and there's already POSIX compliance with GNU
   cc and c++ and the recently-posted POSIX-compliant library sources (which may
   even work on the Amiga; hmmm, something to try this weekend (the libraries,
   that is)).

2) the Concurrent (Perkin-Elmer) XF-210 (68000 with MMU running a (Berkeley)
   Unisoft UNIX) which I have flanking one of my office Amigas.

3) the CADMUS being a 68000-based UNIX box with an MMU. 

I'm sure one can find other examples of non-68020/-68030 680x0-based systems
with MMUs.  Someone must also have used the 68012 in a system(s).

Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]