Date: Mon, 19 Oct 1998 15:45:21 +0200 (MET DST)
From: Olivier Perron <perron AT art DOT alcatel DOT fr>
X-Sender: perron AT rtbsci146s
To: bowman <bowman AT montana DOT com>
Cc: djgpp AT delorie DOT com
Subject: Re: Questions about protected mode interrupt handler
In-Reply-To: <362B3545.498999B@montana.com>
Message-Id: <Pine.GSO.4.05.9810191543420.7866-100000@rtbsci146s>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Reply-To: djgpp AT delorie DOT com

On Mon, 19 Oct 1998, bowman wrote:

> 
> 
> Olivier Perron wrote:
> > 
> > Note that if I hook the timer interrupt (8) it works well both under
> > Windows and plain DOS. It's just the serial port interrupt (and maybe
> > others, who knows) which causes problem.
> 
> Windows is a little stuffy about hardware. It will let you use it if
> nobody has a prior claim staked out, otherwise it quietly ignores your
> request. Is there any modem, printer, or other VxD attached to that
> port?
> 
No that I know about. But it doesn't mean that there are none at all !
As Eli suggested, hooking the real mode interrupt seems to solve the
problem.