Re: The PMMU on the Mac II

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Article #38715

#38715

From: Steve Green
Date: Fri, 03 Mar 1989 17:10

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 The pmmu from apple is just the 68851rc16.  The 16 is the speed (mhz).  The
pmmu replaces the BIG BLACK CHIP.  That is, the only big black chip in a socket.
There is no compatability problems as the mac os ignors it completely. (for now)
Warning: The pmmu's pin 1 is not in the same orientation as the pin 1 of the
cpu, look carefully when installing this at the markings on the board and the
notch on the socket for the pin 1 position.

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!tank!mimsy!tove.umd.edu!steveg

References: <2295@unmvax.unm.edu> <2904@nunki.usc.edu>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!tank!mimsy!tove.umd.edu!steveg
From: steveg@tove.umd.edu (Steve Green)
Newsgroups: comp.sys.mac
Subject: Re: The PMMU on the Mac II
Keywords: PMMU, 68851, Macintosh II
Message-ID: <16197@mimsy.UUCP>
Date: 3 Mar 89 17:10:29 GMT
References: <2295@unmvax.unm.edu> <2904@nunki.usc.edu>
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Reply-To: steveg@tove.umd.edu.UUCP (Steve Green)
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Organization: U of Maryland, Dept. of Computer Science,
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