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From: grr@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Comments on future ASDG products (68020)
Message-ID: <1624@cbmvax.cbmvax.cbm.UUCP>
Date: Fri, 3-Apr-87 04:01:39 EST
Article-I.D.: cbmvax.1624
Posted: Fri Apr  3 04:01:39 1987
Date-Received: Sun, 5-Apr-87 03:08:52 EST
References: <6043@amdahl.UUCP> <276@mcdsun.UUCP> <969@crash.CTS.COM>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 17
Keywords: 68020 ASDG MMU cooperation future

In article <969@crash.CTS.COM> billd@crash.CTS.COM (Bill D'Camp) writes:
>
>Something I wonder about with all this talk of standard versus
>custom MMU's, if the standard MMU for the '020 is so great, how
>come none of the companies making '020 boxes use it?

The biggest problem is that it was in vaporware status for so long that the
various manufacturers couldn't wait and had to implement their own idea of
an MMU.  Since the device is farily complex, if not baroque, most opted for
simpler, non-compatible mechanisms rather than trying to emulate it.

Of course it isn't the fastest thing in the world either, so I you want to
run at maximum speed or implement fast cache memory it just gets in the way.
-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)