Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!nrl-cmf!ukma!rutgers!cmcl2!phri!cooper!john
From: john@cooper.cooper.EDU (John Barkaus)
Newsgroups: comp.sys.atari.st
Subject: Help
Keywords: Writing to Screen Memory
Message-ID: <1436@cooper.cooper.EDU>
Date: 12 Dec 88 23:10:33 GMT
Organization: The Cooper Union (NY, NY)
Lines: 26


Hi,

	I would like to be able to create graphics routines that write
directly to screen memory.  I first tried it in GFA Basic using the
following:
		long{ xbios(2)+offset}=&h12345678

I have been able to get every pixel to go on but I don't know how to
control the color used.  Does anyone know what has to be done to set
the color of a pixel by writing to screen memory. I'd like to be able
to do this in either C or GFA Basic. 
The GFA book (or maybe it was the Mark Williams C book) says that it 
is possible to write to physical screen memory or logical screen memory.

	Can anyone recommend books for the Atari ST dealing with:
	Assembly Language
	Internals
	VDI / AES / TOS

	Thanks in advance.

				John

         John M. Barkaus at the Cooper Union, NY, NY.
           INTERNET: john%cooper.cooper.edu@cmcl2.nyu.edu
                   UUCP: cmcl2!cooper!john