Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!unmvax!ncar!boulder!pikes!udenva!isis!csm9a!kamann
From: kamann@csm9a.UUCP (kamann)
Newsgroups: comp.sys.ti
Subject: Re: Myarc Geneve
Keywords: Graphics capabilities
Message-ID: <1657@csm9a.UUCP>
Date: 14 Jul 89 08:39:05 GMT
References: <4752@psuvax1.cs.psu.edu> <1643@csm9a.UUCP> <176@zip.eecs.umich.edu> <5507@pt.cs.cmu.edu>
Organization: Colorado School of Mines
Lines: 31

In article <5507@pt.cs.cmu.edu>, bjm@RIO.MT.CS.CMU.EDU (Bret Musser) writes:
>
> Also, when you buy a machine like the Atari or Amiga with
> their 68000's, you get much more memory addressable.
> The 9995 is 16 bit.  It can address 64K.  As I recall,
> the 68000 has a 20 or 24 bit bus so can access X megabytes
> (sorry, I don't have a calculator here).  
> 
Is the Atari REALLY accessing X megabytes?  As I recall most architectures
nowadays are built around a page-swapping facility, even IBM.  Let's take a
good look at what has been said.  As most know the TI came standard with 16k
on board.  You could then buy an additional 32k card for it.  But because of
memory for the VDP, etc. the TI actually had around 64k.  Nowadays you can
get gram/ram devices that give you a virtual memory that is somewhat 
limitless (at least from my understanding of it).  Now, I know that IBM is
designed around the concept of a 64k paging area (or the XTs were anyway).
So I think it would be safe to say that an IBM only has 64k addressable also,
or is it?!?  Now, is the Amiga/Atari designed around the same concept?
I wasn't aware that they had 20 bit buses, but there is still a limitation
to the amount of memory you can actually address, even BIG machines use
page swapping mechanisms and virtual memory.

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 Keith Amann                       | "VAX WIZARD in training! GURU wanna be!" 
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 Disclaimer: The thoughts and views discussed above are my own, no one elses! 
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