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From: jack@Taffy.rice.edu (Jack W. Howarth)
Newsgroups: comp.sys.mac.hardware
Subject: Re: The future of the past mac
Keywords: obsolescence
Message-ID: <1990Nov22.050444.22458@rice.edu>
Date: 22 Nov 90 05:04:44 GMT
References: <1990Nov12.122654.9692@rodan.acs.syr.edu> <1990Nov17.230151.9843@rice.edu> <1990Nov21.191611.8439@rodan.acs.syr.edu>
Sender: news@rice.edu (News)
Organization: Rice University
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In article <1990Nov21.191611.8439@rodan.acs.syr.edu> wwtaroli@rodan.acs.syr.edu (Bill Taroli) writes:
>In article <1990Nov17.230151.9843@rice.edu> jack@Taffy.rice.edu (Jack W. Howarth) writes:
>>>I'm using 16MB (4M physical). I understand that NuBus has something to do with
>>>the 14MB limit on the IIs.
>> 
>>[...]
>>only 6 extra meg can be assigned beside the 8 meg
>>available through the motherboard's simm slots. It is my understanding that
>>32 bit clean ROMs (aka IIci, IIfx or IIsi) are required to get more than 
>>8 meg real or 14 meg virtual memory.
>
>You are quite corect in your statement. Connectix's Virtual product maps your
>physical RAM to a virtual memory space. Thus, you aren't getting 14M ADDED to
>the 8M of physical RAM... the extra 6M of address space is simply being used
>to make it appear as though you had 14M ALTOGETHER. (Thus, only 8M of the 14M
>can be present in physical RAM at one time.)
>
>-- 
>*******************************************************************************
>* Bill Taroli (WWTAROLI@RODAN.acs.syr.edu)    | "You can and must understand  *
>* Syracuse University, Syracuse NY            | computers NOW!" -- Ted Nelson *
>*******************************************************************************


That's what I like so much about Virtual is that it is actually a ram cache
of sorts. When applications allocate 2 or 3 meg, much of that heap space is
empty or seldom used by the application. Virtual decides how many pages of
virtual memory deserve to get actual ram memory. A much more effective use of
actual memory than Apple's heap/stack system alone.
                   Jack Howarth