Xref: utzoo comp.sys.mac.hardware:4236 comp.sys.mac.misc:1064
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!austing
From: austing@Apple.COM (Glenn L. Austin)
Newsgroups: comp.sys.mac.hardware,comp.sys.mac.misc
Subject: Re: Addressable memory of 68000 (was Re: New Macs)
Message-ID: <42686@apple.Apple.COM>
Date: 6 Jul 90 02:35:50 GMT
References: <1990Jul4.003731.336@hellgate.utah.edu> <26708@netnews.upenn.edu> <42651@apple.Apple.COM> <1990Jul5.144109.12922@ipsa.reuter.com>
Organization: Apple Computer Inc., Cupertino, CA
Lines: 25

gchow@ipsa.reuter.com (george chow) writes:

>But surely the newer Macs can handle non-contiguous RAM (the ci has got 
>non-contiguous memory due to its onboard video, I believe). Why can't Apple just
>patch the Memory Manager as they've done before for other Managers?

>George Chow

The ci (as I recall) just makes a big "memory block" of the non-contiguous
memory (1MB in bank A, 4MB in bank B), and just takes the RAM off the top
for video.  So, the Memory Manager is happy (it's got "contiguous" memory)
and the user is happy.  The problem with simply patching the Memory Manager
is that almost everything in the Mac is piped through the Memory Manager
at one time or another...

-- 
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| Glenn L. Austin               | "Turn too soon, run out of room,          | 
| Auto Racing Enthusiast and    |   Turn too late, much better fate"        |
| Communications Toolbox Hacker |   - Jim Russell Racing School Instructors |
| Apple Computer, Inc.          | "Drive slower, race faster" - D. Waltrip  | 
| Internet:   austing@apple.com |-------------------------------------------|
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