🚀 go-pugleaf

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