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From: rwyckoff@copper.ucs.indiana.edu (richard wyckoff)
Newsgroups: comp.sys.mac.hardware
Subject: Re: What a II,IIx,IIcx,IIci,IIfx,IIsi,LC??????
Message-ID: <1991Feb11.224954.26916@bronze.ucs.indiana.edu>
Date: 11 Feb 91 22:49:45 GMT
Sender: daemon@bronze.ucs.indiana.edu (Mr Background)
Organization: Indiana University
Lines: 27



True 32-bit addresses can access 4 GIGABYTES of memory.
System 7 will allow VIRTUAL MEMORY... you can address *all 4 GIGABYTES*,
even if some of that "memory" is paged out to disk.
Yes, for most the current practical limit for real memory is 16MB * #SIMM-slots,
or 128MB on an fx or ci.

256kb SIMMS are virtually free,
1MB SIMMS have been under $50,
4MB SIMMS have been down under $200,
16MB SIMMS are still outrageous,
who knows what's next? 

Also note that the cx is no longer in production.
I thought the II and IIx were also history, but I could be wrong.

(using a certain trick apparently *unknown* to the Dogcow..)
FYI, even before System 7a, it's possible to get 100MB (or more) on a ci.
This mem was NOT in the normal SIMM slots... but on a NuBus (cache?) card,
and was used by Allegro Common Lisp, which had a software patch known as
fixMMU-IIci.  ACL was a Coral product, now is Apples.
(We had this at work....)

           ...Rich

(rwyckoff@copper.ucs.indiana.edu)