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From: fxl@AIDS-UNIX (Franz Lanzinger)
Newsgroups: net.micro.atari8
Subject: Re:  Serious ST Questions
Message-ID: <8602241936.AA21595@ucbvax.berkeley.edu>
Date: Mon, 24-Feb-86 13:37:39 EST
Article-I.D.: ucbvax.8602241936.AA21595
Posted: Mon Feb 24 13:37:39 1986
Date-Received: Wed, 26-Feb-86 07:33:46 EST
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Organization: The ARPA Internet
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Regarding the access to the 520 ST RAM bitmap:

	The 32K bitmap sits on the bus, and can be anywhere in physical
memory, as long as it aligned with a 256 byte boundary.  There are
BIOS (or is that XBIOS) routines to set and get the addresses of both
the physical and the logical screen.  This makes it possible to do
double buffering using their (or your own) graphics routines.  You
could even do this in BASIC using peek and poke, though this approach
is probably not fast enough to bother with.

		Franz Lanzinger (fxl@aids-unix)
		phone: (415) 941-3912