Date:	Tue, 19 Dec 1995 14:37:06 +0200 (IST)
From:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To:	Larry Blanchard <larryb AT comtch DOT iea DOT com>
Cc:	djgpp AT delorie DOT com
Subject:	Re: DJGPP and interrupts

On 17 Dec 1995, Larry Blanchard wrote:

> I have a project where I need to use a 32 bit linear memory model, but
> still have access to hardware interrupt vectors such that I can point
> them to a function in my process.
> 
> Does DJGPP have such a facility?  If not, any suggestions not involving
> an astonomically priced package would be appreciated.  Thanks.

Yes, it does.  Take a look at Chapter 18 of the DJGPP FAQ list (avialable 
as faq102.zip from the same place you get DJGPP).  It describes the 
facilities and some background issues and points you to library docs for 
the functions that are involved.

The final production version of your program should probably be compiled 
in DJGPP v2.0 (to be released soon), because the current version has some 
subtle problems in hardware interrupts support, but it's a start (and for 
low interrupt frequency you can just get away without hitting these 
problems at all).

There is also a package called PCTIME13.ZIP on SimTel mirrors 
(in the SimTel/msdos/c directory) which can serve as a good example of 
using DJGPP to hook hardware interrupts.

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