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From: dwal@ellis.uchicago.edu (David Walton)
Newsgroups: comp.sys.mac.system
Subject: Re: Another Mac II si question
Keywords: Mac, si
Message-ID: <1990Dec1.011249.20017@midway.uchicago.edu>
Date: 1 Dec 90 01:12:49 GMT
References: <603@ssdc?> <17900@hydra.gatech.EDU>
Sender: news@midway.uchicago.edu (News Administrator)
Organization: University of Chicago, Academic and Public Computing
Lines: 24

In article <17900@hydra.gatech.EDU> ccocswr@prism.gatech.EDU (Winston Rast  (Micro- coop)) writes:

>The MacIIsi _can_ be upgraded to 17Megs RAM directly.  However, only
>16 will be seen by the finder due to current system software (wait
>for system 7.0).

Actually, only 8 Megabytes of RAM will be usable.  The OS under System
6.0.x and before uses 24-bit memory addressing, which means that 16
total megabytes of memory can be addressed.  Of that space, 8
Megabytes is reserved for ROM, so you can only address 8 megabytes for
RAM--System, Finder, applications.  With third-party products (like
Maxima from Connectix), you can use up to 14 Megabytes of RAM, but
the System itself doesn't have that capability.

As you pointed out, though, once you get System 7.0, you'll be able to
use all 17 Megabytes.

>-|  Winston M. Rast        \\     Ever seen a low-cost color Mac?|     -


--
David Walton            Internet: dwal@midway.uchicago.edu
University of Chicago   {  Any opinions found herein are mine, not  }
Computing Organizations {  those of my employers (or anybody else). }