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From: gchow@ipsa.reuter.com (george chow)
Newsgroups: comp.sys.mac.hardware,comp.sys.mac.misc
Subject: Re: Addressable memory of 68000 (was Re: New Macs)
Message-ID: <1990Jul5.144109.12922@ipsa.reuter.com>
Date: 5 Jul 90 14:41:09 GMT
References: <1990Jul4.003731.336@hellgate.utah.edu> <26708@netnews.upenn.edu> <42651@apple.Apple.COM>
Reply-To: gchow@itcyyz.UUCP (george chow)
Organization: I.P. Sharp Associates, Toronto Ont., Canada.
Lines: 26

In article <42651@apple.Apple.COM> austing@Apple.COM (Glenn L. Austin) writes:
>jeff@eniac.seas.upenn.edu (Jeff White) writes:
>
>>  On a related note, does anyone know if the 68000 can address more than 4 Megs
>>of RAM (ie. is the present 4 Meg limit with Pluses and SE's a 68000 limit or
>>just the way Apple designed those systems)?
>
>The problem is that the ROMs on the Plus and SE are located at the 4MB
>address location.  Since the Memory Manager doesn't know how to handle
>non-contiguous RAM, 4MB is the limit on these machines.

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?

>-----------------------------------------------------------------------------
>| Glenn L. Austin               | "Turn too soon, run out of room,          | 
>| Auto Racing Enthusiast and    |   Turn too late, much better fate"        |
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>| Internet:   austing@apple.com |-------------------------------------------|
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George Chow