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From: sslee@polyslo.CalPoly.EDU (Steven Lee)
Newsgroups: comp.sys.atari.st
Subject: switching res
Message-ID: <27859cda.6547@petunia.CalPoly.EDU>
Date: 5 Jan 91 09:31:06 GMT
Reply-To: sslee@polyslo.CalPoly.EDU (Steven Lee)
Organization: Cal Poly State Univ,CSC Dept,San Luis Obispo,CA 93407
Lines: 29



Does anyone know of a legal or illegal way to switch resolution without
going through the desktop?  This would be convenient to write low res
programs while running in medium res (such as using Laser C).  I have
TOS 1.0 but I suppose I could check the TOS version and use differenct
methods if necessary.

The only thing that remotely comes close to what I wanted was in a
program called AVS.PRG (Audio-Visual Player by Jim Kent, released by
STart).  For example, if you were in medium res and wanted to be in
low res...

	char *ainit=(char *)a_init;  /* Line A call, $A000 */
	Setscreen(-1L,-1L,0);
	*((int *)(aline-692))=319;   /* Mouse X limit */
	*((int *)(aline-690))=199;   /* Mouse Y limit */
	*((int *)(aline-666))=16;    /* # of bitplanes */

Apparently, that works in setting the boundaries for moving the mouse
cursor.  It also shows the correct colors.  Unfortunately, it does not
center dialog boxes correctly, does not clear the area under the drop-down
menus, and some VDI functions (such as drawing ellipses) do not work as
expected.

I know using Line A is not recommended in the TTs but this is for my own
personal use.

Steven Lee