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From: dclemans@mntgfx.MENTOR.COM (Dave Clemans)
Newsgroups: comp.sys.atari.st,comp.sys.amiga
Subject: Re: And the winner is...
Message-ID: <808@dclemans.mntgfx.MENTOR.COM>
Date: Fri, 17-Jul-87 12:00:37 EDT
Article-I.D.: dclemans.808
Posted: Fri Jul 17 12:00:37 1987
Date-Received: Sat, 18-Jul-87 19:39:35 EDT
References: <17680@cca.CCA.COM> <979@eneevax.UUCP> <8707142117.AA00550@cogsci.berkeley.edu>
Organization: Mentor Graphics, Beaverton OR
Lines: 13
Summary: ST memory size limitations
Xref: mnetor comp.sys.atari.st:4484 comp.sys.amiga:6612


The ST has an architectural limitation of 15.5 megabytes.  The other 1/2
megabyte of 68000 address space is taken up by rom's and I/O space.

Existing ST's can easily be taken to 4 megabytes by using 1 megabit ram chips.
With enough work you could take an existing system past 4 megabytes, but the
amount of work needed would almost definitely be greater than the benefits
you'd gain.

However, if the expansion bus in the Mega-ST's was done correctly, it should
be relatively simple to take one of these newer systems past 4 megabytes.

dgc