Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!usc!jarthur!nntp-server.caltech.edu!gah
From: gah@hood.hood.caltech.edu (Glen Herrmannsfeldt)
Newsgroups: comp.os.os2.misc
Subject: Re: com port 3 under 1.21
Message-ID: <gah.672403820@hood>
Date: 23 Apr 91 10:50:20 GMT
References: <9756@star.cs.vu.nl> <47518@ut-emx.uucp> <1991Apr21.081003.22620@mathrt0.math.chalmers.se>
Sender: news@nntp-server.caltech.edu
Distribution: comp.os.os2.misc
Organization: California Institute of Technology, Pasadena
Lines: 9

I got COM3/4 by patching COM01.SYS, and loading the original and patched
copy.  As said before, you MUST have a different IRQ for each port.

Note that IRQ2 is interrupt level 9 in the OS/2 numbering system.

This is the way the 8259 is wired up in AT type machines.

By the waay, why won't 8250's work with OS/2?  Is it just speed,
or is it more complicated than that.