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Subject:	Re: delay() different bahavior under Win98 window/fullscreen in DJGPP 2.04
From:	"Rod Pemberton" <do_not_have AT bitfoad DOT cmm>
Date:	Wed, 13 Dec 2006 11:52:10 -0500
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"Alexei A. Frounze" <alexfru AT chat DOT ru> wrote in message
news:AKydnWmn0cs-5eLYnZ2dnUVZ_obinZ2d AT comcast DOT com...
> I had to fix a couple of "induced" bugs in my DOS applications because of
> this. One app was an i8051 emulator which was checking if a key is pressed
> after execution of every instruction. The idea was to stop execution if a
> key was pressed. What happened is that Windows decided that the app is
doing
> too much of keyboard checks doing nothing good inbetween and slowed it
down
> below any reasonable level. Since this happens not immediately, on short
> 8051 pieces of code you'd never see this problem because there would be
not
> enough keyboard checks. But on larger 8051 pieces of code, there would be
> too many checks before the code finishes. My fix was to remove the old
> checks (calls to BIOS/DOS to see if a key is pressed) and hook up to the
> keyboard IRQ and get this info the other way.
>

This post provides an alternate method to _bios_keybrd():
http://groups.google.com/group/openwatcom.contributors/msg/ca944968d2a3485d?hl=en

I was planning on trying that method, but then I remembered that it may have
to be modified slightly for XP (perhaps NT,2k??):
http://groups.google.com/group/comp.os.msdos.djgpp/msg/67916cf4c1c73b7e?hl=en
http://groups.google.com/group/comp.os.msdos.djgpp/msg/30ac39382eb3560e?hl=en

What's interesting is that I haven't seen the OW guys bring up that last
issue with XP...


Rod Pemberton

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