Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!oberon!nunki.usc.edu!castor.usc.edu!malczews
From: malczews@castor.usc.edu (Frank Malczewski)
Newsgroups: comp.sys.mac
Subject: Re: The PMMU on the Mac II
Keywords: PMMU, 68851, Macintosh II
Message-ID: <2904@nunki.usc.edu>
Date: 3 Mar 89 06:04:22 GMT
References: <2295@unmvax.unm.edu>
Sender: news@nunki.usc.edu
Reply-To: malczews@castor.usc.edu (Frank Malczewski)
Distribution: na
Organization: University of Southern California, Los Angeles, CA
Lines: 20

In article <2295@unmvax.unm.edu> mark@sleepy.cs.unm.edu () writes:
>I have a Macintosh II and in anticipation of running A/UX need to obtain
>the 68851 Paged Memory Management Unit (PMMU).  I have a few questions,
>however, which I was hoping somebody out there might be able to answer.
>First, what comes with Apple's product #M0221 68851 PMMU, i.e., if I
>bought the chip through Apple what do I get--just the chip itself?
>Second, what is the exact chip number?  There are several versions of
>the MC68851 running at different speeds.  I think it might be MC68851RC-16A.
>If someone out there has a Mac II with this chip perhaps they could look
>at it and get the precise number.  And finally how do I install the chip,
>i.e., where exactly does it go?

Actually, I was about to post a similar query concerning the PMMU, and 
would like to see the replies to the above; additionally I would like to know
(since I won't be using AUX) if using the PMMU now (in anticipation of 7.0)
with the current 6.0 system will result in ANY compatibility problems (of, say,
the nature of those seen with some of the 68030 models) with currently released
software, especially software development software.

  -- Frank Malczewski        (malczews@castor.usc.edu)