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From: news@pasteur.Berkeley.EDU (Six o'clock News)
Newsgroups: comp.sys.mac.system
Subject: Re: Virtual Memory problem
Summary: Hmmm
Message-ID: <13704@pasteur.Berkeley.EDU>
Date: 19 May 91 02:56:40 GMT
References: <29368@hydra.gatech.EDU>
Reply-To: chenp@cory.Berkeley.EDU
Organization: University of California, Berkeley
Lines: 32

From: chenp@cory.Berkeley.EDU (Paul "Mega Drive and Lynx" Chen)
Path: cory.Berkeley.EDU!chenp

>Hi, I work on an original Mac II with a 68020 processor and PMMU installed.
>It has 8 megs of RAM on board but when I pull up the memory control panel,
>it only allows me to access 12 megs of RAM as virtual memory. Does anybody
>have a clue as to why it won't let me access at least 16 megs if not more?
>Thanks for your help.

Hmm, interesting. All I know is that only 32-bit clean ROM's can access the
full 32 bits of address. Every other Mac has 32-bit dirty (?) ROM's so they
work in 24-bit mode, which means you can only access up to 16 megs of VM.
The only 32-bit clean ROM Macs that I know of are the ci, fx, and I think the
si.

As for your other problem, I don't know.

Paul


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"... Particle man			
 Is he a dot, or is he a speck?		      	Game Boy
 When he's underwater				Lynx
 does he get wet?				Mega Drive
 or does the water get him instead?"		PC-Engine CG
(Some mind-boggling questions from the song
 "Particle Man" by They Might Be Giants.)
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  chenp@cory.berkeley.edu			One of these days I'll get my
						hands on System 7.
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