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From: pkr@maddog.sgi.com (Phil Ronzone)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Motorola 68851 PMMU discontinued
Message-ID: <1077@odin.SGI.COM>
Date: 24 Oct 89 17:51:01 GMT
References: <929@unsvax.NEVADA.EDU> <1044@odin.SGI.COM> <3360@netcom.UUCP>
Sender: news@odin.SGI.COM
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 15

In article <3360@netcom.UUCP> wasilko@netcom.UUCP (Jeff Wasilko) writes:
>
>Is Sun still shipping Sun 3/60s?
>
>I would assume that they need PMMUS to run unix...

No, the SUN 3 uses a discrete logic MMU. A major drawback is that it was
expensive if you had to unload a context. A fun thing to do with A/UX was
to set up a benchmark involving 30 processes passing short messages to
each other. The context switch load/unload on the SUN would kill it in
comparision with any PMMU based system.
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Phil Ronzone   Manager Secure UNIX           pkr@sgi.COM   {decwrl,sun}!sgi!pkr
Silicon Graphics, Inc.               "I never vote, it only encourages 'em ..."
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