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From: tholen@uhccux.uhcc.Hawaii.Edu (David Tholen)
Newsgroups: comp.os.os2.misc
Subject: Re: Serial port and 16550 chip
Message-ID: <13262@uhccux.uhcc.Hawaii.Edu>
Date: 30 May 91 21:52:26 GMT
Organization: University of Hawaii
Lines: 17

Mikael Wahlgren writes:
 
> As I got a lot of mail requesting the patch, I will describe it here.  First
> of all, I don't know about the legal matters implementing this patch, as you
> have to alter device drivers from IBM, so you take all responsibility yourself

Many thanks for this patch, which I will give a try.  I would also like to
emphasize that IBM will likely not support a system with a patched serial
port driver, so be sure to keep the original driver around just in case.

The remaining question is this:  why doesn't the supplied driver support
high baud rates?  IBM's hardware will support higher serial port speeds
(at least the new Models 90 and 95), and the available communications
programs will also support higher speeds, so why was the driver written to
support speeds up to only 19200, especially if the patch is as simple as
Mr. Wahlgren has indicated?  Is there a reliability problem?  Can some
knowledgable IBMer explain why the higher speed shouldn't be used?