Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!apple!noah
From: noah@Apple.COM (Noah Price)
Newsgroups: comp.sys.mac.hardware
Subject: Re: PMMU question
Summary: Yup, Hochsprung.
Keywords: HMMU, PMMU, Hochsprung
Message-ID: <35885@apple.Apple.COM>
Date: 24 Oct 89 21:08:22 GMT
References: <27044.2543231E@cmhgate.FIDONET.ORG>
Followup-To: comp.sys.mac.hardware
Organization: Apple Computer Inc, Cupertino, CA
Lines: 24

In article <27044.2543231E@cmhgate.FIDONET.ORG> Adam.Frix@f200.n226.z1.FIDONET.ORG (Adam Frix) writes:
>
>I recently flipped through a very new (1989) book about the Mac II
>(obviously written before the 030 machines came out, but published
>afterwards).  It was allegedly a technical treatment of the machine, but I 
>didn't look at it that closely.  What I did read was that HMMU stood for
>"Hochsprung Memory Management Unit" or some such thing.

>I'll use this bandwidth to ask:  was the author of this book just spouting 
>off, because he didn't know any better?  I mean, F,G,HMMU sounds so
>simple--and, of course, the simplest explanation is usually the correct
>one--that I'm questioning this Hochsprung MMU thing.

In my copy of the Mac II Family Hardware Reference ('88), HMMU and Hochsprung
Memory Management Unit don't appear in the text, but are cross-referenced in
the index to AMU.  The H did indeed come from Hochsprung, the name of one of
the chip's designers.


noah

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noah@apple.com                                    Mac IIci Hardware Design Team
..!{sun,decwrl}!apple!noah                                 Apple Computer, Inc.