Xref: news2.mv.net comp.os.msdos.djgpp:6314
From: alaric AT abwillms DOT demon DOT co DOT uk (Alaric B. Williams)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Hardware Interrup Handlers & DJGPP
Date: Tue, 23 Jul 1996 11:13:36 GMT
Lines: 37
Message-ID: <838120315.10346.3@abwillms.demon.co.uk>
References: <837175084 DOT 12151 DOT 0 AT abwillms DOT demon DOT co DOT uk> <4sva4h$suo AT leporello DOT cs DOT unibo DOT it>
NNTP-Posting-Host: abwillms.demon.co.uk
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

gaggi AT cs DOT unibo DOT it (Nicola Gaggi) wrote:

>Alaric B. Williams (alaric AT abwillms DOT demon DOT co DOT uk) wrote:

>: I'm writing a tutorial on DJGPP hardware interrupts! I'll post the
>: first draft in a couple of days.

It'll be a little delayed; I'm busy :-(

>I am interested in hardware interrupt programming too.
>Well, I have a problem: I need to call the original interrupt code before
>call my interrupt handler, how can I do this? I have used the function
>go32_dpmi_chain_etc... but this routine chains the orignal interrupt code
>*after* the user interrupt handler.

Watcha need to do is keep the original real mode handler address, and
use a function called something like "_go32_simulate_fcall_iret" (look
in info) to chain the original handler. Put this at the start of thy
handler. I haven't tried this lately, so there may be something I've
forgotten!

>Is there in your tutorial a solution for this?

There will be...

>Could you mail-me a copy of your tutorial?
>Thank you.  

Sure!

ABW
--
I have become... Comfortably numb...

Alaric B. Williams Internet : alaric AT abwillms DOT demon DOT co DOT uk
<A HREF="http://www.hardcafe.co.uk/Alaric/">http://www.hardcafe.co.uk/Alaric/</A>