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Message-ID: <00a101c1b73f$5ab02340$c03dfea9@atlantis>
From: "Matthias Paul" <Matthias DOT Paul AT post DOT rwth-aachen DOT de>
To: <opendos AT delorie DOT com>
References: <5 DOT 0 DOT 2 DOT 1 DOT 0 DOT 20020215155258 DOT 00a5d200 AT mail DOT amtelecom DOT net>
Subject: Re: Serial I/O
Date: Sat, 16 Feb 2002 17:27:15 +0100
Organization: University of Technology, RWTH Aachen, Germany
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Reply-To: opendos AT delorie DOT com

On 2002-02-15, Stephen W. Boyd wrote:

> I am using a very old version of DR/DOS that is embedded in the
> ROM of a hand held device.

May I ask you which version you have exactly? I´m just curious...
Is this an issue of PalmDOS?

> Everything works fine unless I lose DSR during a write operation.
> In that case I am getting the infamous 'Abort/Retry/Fail' message
> rather than just getting a bad status code returned.  Does anyone 
> know of anyway to suppress the error message?

The proper way would be to install your own Critical Error Handler
(INT 24h) in your application, of course.

But here are a few other things to try:

Well, "old" is relative, so if you would be using the OpenDOS 7.01+
(1997-03-21) or newer, you could try COMMAND.COM /N to suppress
the shell´s Critical Error handler. The default handler in the
kernel will always assume Fail without displaying a message.
OpenDOS 7.02 BETA (1997-11-13) and anything newer also supports
the more standard option /F.

As Alian Mouette suggested, MODE COM#:b,p,d,s,P is also worth
a try. The ,P (not RETRY=P) will retry instead of timeout.

Finally, if your hand held would be connected with the server
through a modem, you could use AT commands to fiddle around
with the configuration of the DSR wire there.

Hope it helps,

 Matthias

-- 
<mailto:Matthias DOT Paul AT post DOT rwth-aachen DOT de>; <mailto:mpaul AT drdos DOT org>
http://www.uni-bonn.de/~uzs180/mpdokeng.html; http://mpaul.drdos.org