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From:	Charles Sandmann <sandmann AT praline DOT no DOT NeoSoft DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: IRQ0 & DPMI
Date:	Mon, 05 Jun 1995 09:49:21 CDT
Organization:	NeoSoft Internet Services +1 713 968 5800
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Reply-To:	sandmann AT clio DOT rice DOT edu
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To:	djgpp AT sun DOT soe DOT clarkson DOT edu
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>   Just a real quick question, so I understand completely.  Does the
> default protected-mode IRQ0 handler chain down to the real-mode
> handler, or does GO32 setup protected-mode code to do the same job?
> (It seems strange to think that we would be switching to and fro 18.2
> times a second and still our programs are so fast! :-)

The default PM IRQ0 handler chains to the RM handler, yes.  On a 486/33
you can do about 10K of these mode swaps per second - so the 18 is
very negligible

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