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From: hades@eleazar.dartmouth.edu (Hades)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Memory Limitations on IIsi
Message-ID: <1991May21.144108.9563@dartvax.dartmouth.edu>
Date: 21 May 91 14:41:08 GMT
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meckert@eniac.seas.upenn.edu (Michael Eckert) writes:


>Since accessing large amounts of memory seems to be
>so important (see the Dirty (Non 32-bit Clean) ROM 
>issue), I have a question. I have a MAC IIsi which has
>only four SIMM slots, which means that at present
>I can have a maximum of 17 MB (4 x 4MB SIMMS + 1MB)
>on the computer.  Will I be able to pop in
>16 MB SIMMS when they become available?  Or are there
>hardware limitations on memory access?  This is an important
>question for a budding power user of the future.

    If you are running Sys 7.0 in 32-bit address mode, a 68030 can access
up to 128 Mbytes of Total RAM (Physical and Virtual in any combination,
although it is not recommended that you use more than Virtual = 2*Physical
or something like that). Therefore 16 MB SIMMS should work just fine in a
IISi under these conditions.

-- 
-Hades
 Hustler Emeritus, Alpha Theta Co-ed Fraternity
 hades@Eleazar.Dartmouth.Edu
-You know the economy's going to hell when drug dealers buy fuel efficient cars