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From: d9mikael@dtek.chalmers.se (Mikael Wahlgren)
Newsgroups: comp.os.os2.misc
Subject: Re: com port 3 under 1.21
Message-ID: <1991Apr21.081003.22620@mathrt0.math.chalmers.se>
Date: 21 Apr 91 08:10:03 GMT
References: <9756@star.cs.vu.nl> <47518@ut-emx.uucp>
Sender: news@mathrt0.math.chalmers.se (Evald Nyhetsson)
Distribution: comp.os.os2.misc
Organization: Chalmers University of Technology, Gothenburg, Sweden
Lines: 30

In article <47518@ut-emx.uucp> ifam655@ccwf.cc.utexas.edu (Jeff Lessem) writes:
>How can I set up more than 2 serial ports on my AT running OS/2 1.21?

This is one of the most commonly asked questions.  There is a public domain
COM0x-replacement, that lets you specify both IRQ-level and I/O-address.  It
is possible to install this driver multiple times with different values, making
it possible to use any amount of serial ports, as long as you install the ports
at different I/O-addresses (of course) AND DIFFERENT IRQ's, as the driver don't
handle shared interrupts.

The driver is also said to be more reliable than the included COM0x-driver.  It
is bundled with one driver for the 16450 UART and another for the 16550 UART.
If you have a 8250 UART, you are out of luck, but may still get what you want
if you install the included COM0x-driver for two ports, and the PD driver
for the third port (which MUST have a 16450 or 16550 UART).

The driver is called COM16550.Z(IP, and is available at some BBS's around the
world.  Mail me a message if you are interested and I can mail you the package,
or I could send it to the os2 binaries.

Mikael Wahlgren








Mikael Wahlgren      d9mikael@dtek.chalmers.se