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From: mats@dual.UUCP (Mats Wichmann)
Newsgroups: net.micro.68k
Subject: Re: The 68010 and MMU's
Message-ID: <702@dual.UUCP>
Date: Sun, 22-Jul-84 21:25:45 EDT
Article-I.D.: dual.702
Posted: Sun Jul 22 21:25:45 1984
Date-Received: Mon, 23-Jul-84 02:22:51 EDT
References: <3114@brl-tgr.ARPA> <2083@rlgvax.UUCP> <700@dual.UUCP>
Organization: Dual Systems, Berkeley, CA
Lines: 13

As Erik pointed out, the 451 MMU exists - we have been shipping
product with this chip since May, 1982. As to whether it is a good
chip or not - not great, but it works. Who can afford to wait years
until someone `does it right' when the market windows are so small?
You have to come out with whatever is feasible at the time you
are designing the product, which is why we use a 451, Sun uses
something of their own design with TTL chips, most of the rest of
the micro-unix world uses one or the other of those schemes, and very 
few people are using the National MMU.

	    Mats Wichmann
	    Dual Systems Corp.
	    ...{ucbvax,amd,ihnp4,cbosgd,decwrl,fortune}!dual!mats