From: Leif <LeifDude AT hotmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Mouse/Int 33h Problems
Date: Tue, 01 Sep 1998 22:36:41 -0700
Organization: NorthWest Nexus Inc.
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To: djgpp AT delorie DOT com
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I dont know whats goin on with my progy. Im writing a program and using
int86() to call mouse functions of INT 33h. Everything was working fine
and dandy(with a couple of exceptions I will describe later) untill I
added a new loop/function in my program. Every time I called this loop
it caused Int33h Function 03h (Get MousePosition) to report falsely. So
I started to debug my new loop/function. I couldnt find out what the
problem was so I took out the insides of my loop. And my problem
remained. The loop now looks something like...

void MyLoop(char *S){
/*
     All the junk in my loop inside here...
*/
}

When I call this loop int33h reports mouse position all screwy and VERY
similarly to the way it was reporting when I was getting the mouse junk
coded in the first place.
My problems at first were fixed by loading bx,cx and dx with 0. Even
though int33H only needs ah=0 and al=3. When I didnt load bx-dx with 0
the screwy reports were coming in. These reports look exactly like the
ones im getting now by calling this empty function.

What gives? Have I reached a limit of some kind in GlobalData or Code
Size?

Any thoughts/ideas or help would be appreciated.
P.S. Ive tried various combinations of debugging/optimization switches
when compiling including none at all.