Xref: news-dnh.mv.net comp.os.msdos.djgpp:205
Path: news-dnh.mv.net!mv!news.sprintlink.net!gatech!swrinde!news.uh.edu!uuneo.neosoft.com!news!sandmann
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
Lines: 10
References: <3qrg2k$gp7 AT news DOT telebyte DOT com>
Reply-To: sandmann AT clio DOT rice DOT edu
Nntp-Posting-Host: praline.no.neosoft.com
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

>   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