Date: Thu, 8 Apr 1999 12:01:04 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Daniel Eaton <deaton AT hockeytown DOT net>
cc: djgpp AT delorie DOT com
Subject: Re: Mouse Problems
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On Tue, 6 Apr 1999, Daniel Eaton wrote:

> I can initialize no problem, but when I poll for mouse moves
> delta x and y will never be negative and therefore the mouse is only able to
> move right and down.

Are you using int86 to poll the mouse?  If so, change your code to use
__dpmi_int instead.  int86 has problems with the 16- vs 32-bitness of
the registers, and the resulting effects can drive you crazy ;-).

> Also, __dpmi_int kicks me out of protected mode for a
> few moments to interrupt 0x33 (in my case) and lags the program a bit, does
> it not?

The slow-down from the mode switches should not be too painful, unless
you poll the mouse too frequently.

> Is there any better way to play with the mouse driver in protected
> mode?

Not unless you have a protected-mode mouse driver, AFAIK.