From:	"Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: InDOS Flag
Date:	Mon, 21 Apr 1997 23:20:17
Organization:	Aspen Technology, Inc.
Lines:	10
Message-ID:	<335bf631.sandmann@clio.rice.edu>
References:	<Pine DOT SUN DOT 3 DOT 91 DOT 970421094517 DOT 2725B-100000 AT is>
Reply-To:	sandmann AT clio DOT rice DOT edu
NNTP-Posting-Host:	spica.dmccorp.com
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

> the Idle interrupt, Int 28h.  A TSR should hook that interrupt if it
> needs to be able to pop up during this time.  Note that for DJGPP
> programs, the complication here is that Int 28h is a *software* interrupt 
> and therefore is not reflected to protected mode by the DPMI host.  

In this case you allocate a RMCB (real mode callback) and replace int 28h
with this value.  This will cause a call to your PM code whenever int 28h
was called.  You could also use RMCBs to install a RM entry to your PM
code - so you can essentially do everything in a PM TSR as you could in
a RM one (theoretically).

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