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From: xdab@ellis.uchicago.edu (David Baird)
Newsgroups: comp.sys.mac.misc
Subject: Re: 20megs - System used = 6megs left?
Message-ID: <1991Jun26.170014.14999@midway.uchicago.edu>
Date: 26 Jun 91 17:00:14 GMT
References: <5494@network.ucsd.edu>
Sender: news@midway.uchicago.edu (NewsMistress)
Organization: University of Chicago
Lines: 31

In article <5494@network.ucsd.edu> simon@ivem1.ucsd.edu (Simon) writes:
>Hello. I have a Mac IIfx and 20 megs installed inside, 4x4meg SIMMS,
>and 4x1meg SIMMs.  The problem is, the system only show 6 or so megs for use
>while the System seems to be taking the rest of the available ram (13megs).
>
>Does anybody know how to get the memory back into unused ram?  Or is the
>SIMMs bad?  Or are they in wrong?  I don't think it's in wrong; the 4
>meg SIMMs are in Bank B while the 1 meg SIMMs are in Bank A.
>
>Any help would be appreciated.
>-Simon

You did not say if you were running System 6.0.x or System 7.0. If 
you are running System 7.0 turn on 32-bit memory with the
Memory cdev in the Control Panels.

If you are running System 6.0.x or System 7.0 without 32-bit memory
turned on, your machine can only access 8 megs of Ram. The System
will keep all the memory because it doesn't know what to do with
it otherwise. (OK, I know thats not a techie explanation, but
it does "explain" the situation.    :-)     ).





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