Date: Sat, 21 Oct 2000 08:52:12 +0200
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: "chimin" <chiminng AT hotmail DOT com>
Message-Id: <3405-Sat21Oct2000085211+0300-eliz@is.elta.co.il>
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CC: djgpp AT delorie DOT com
In-reply-to: <39f111ec.0@news.tm.net.my> (chiminng@hotmail.com)
Subject: Re: Calling Old Interrupt
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> From: "chimin" <chiminng AT hotmail DOT com>
> Newsgroups: comp.os.msdos.djgpp
> Date: Sat, 21 Oct 2000 11:48:07 +0800
> 
> Interrupt start
> My code
> Call the old interrupt
> My code
> Interrupt end

I think you need to use inline assembly like this:

    __asm__ __volatile__ ("lcall %cs:*_old_int");

where `old_int' is the variable declared "__dpmi_paddr old int;",
in which you saved the old interrupt handler address.