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From: jec@iucs.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Comments on future ASDG products (6
Message-ID: <36400001@iucs>
Date: Fri, 3-Apr-87 14:48:00 EST
Article-I.D.: iucs.36400001
Posted: Fri Apr  3 14:48:00 1987
Date-Received: Sun, 5-Apr-87 07:53:51 EST
References: <6043@amdahl.UUCP>
Organization: Indiana University CSCI, Bloomington
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Nf-ID: #R:amdahl.UUCP:-604300:iucs:36400001:000:542
Nf-From: iucs.cs.indiana.edu!jec    Apr  3 14:48:00 1987


	The problem with the 68020 is that it doesn't have an MMU (this is
supposedly fixed by the 68030).  The "standard" Motorola chip that was out
there when the 68020 came out was the 68451 MMU.  It was a real dog if you
were trying to implement something like UNIX.  The newer chip, the 68851
sounds a lot better and I suspect that the 68030 MMU will look a lot like
that it.

	So, the current standard MMU for the 68020 is probably the 68851
and the reason people didn't use it in their workstations was that it wasn't
available at that time.