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<H4>"Linux Gazette...<I>making Linux just a little more fun!</I>"
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<H1 align="center"><A NAME="answer">
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<H4 align="center">By James T. Dennis,
<a href="mailto:answerguy@ssc.com">answerguy@ssc.com</a><BR>
Starshine Technical Services,
<A HREF="http://www.starshine.org/">http://www.starshine.org/</A> </H4>
<p><hr><p>
<H3><img src="../gx/dennis/qbub.gif" alt="(?)" width="50" height="28"
align="left" border="0">readdress COM port to 3 or 4</H3>
<p><strong>From PJ on 25 Jun 1998
<!-- begin body -->
<BR><BR>
can you tell me how to readdress COM port2 to port 3 or 4?
I need to use COM port 2 for other device.
</strong></p>
<blockquote><img src="../gx/dennis/bbub.gif" height="28" width="50"
alt="(!)" border="0"
>No. I can't. You'll want to refer to the documentation
that should have come with your hardware (this is almost
certainly a hardware issue that is completely unrelated to
the OS or software that you're running). The details vary
among manufacturer, devices and models.
<br><br>
If you have a couple of COM ports built into your
motherboard it is possible that you can disable or reset
the I/O addresses, IRQ's and other details for your COM
ports via the CMOS setup program (the interface through which
you set the date and time, the hard drive type and geometry and
various other firmware settings that are stored in extra registers
of your PC's clock chip --- a chip which uses CMOS technology
so that it dissipates very low power consumption and is thus
suitable for operation off of a battery while the system is
powered down).
<br><br>
This "setup" program is usually (almost always) stored in
the system firmware (the BIOS ROM's on your motherboard) and
is typically accessible at boot/power-up via some system dependent
keystroke. Usually there is a message that is briefly displayed
to note what the magic keystroke would be --- something like:
<blockquote><code> "Press <Del> not to enter Setup"
</code></blockquote>
If that doesn't work (either because your COM ports are not
on your motherboard or for other reasons) you can open up the
case and look at the various DIP and/or "berg" (jumper pins)
settings that you'll find. Some of them may be labelled.
There might also be a manufacturer's mark that might lead you
to a website or phone number where you can get support and
documentation for the device.
<br><br>
If you can't find any documentation for some cheap multi-function
(IDE, floppy, COM, and parallel port) card --- your best bet is to
buy a new one (typically $10 to $35 US) and toss the old one into
a drawer as an emergency spare.
<br><br>
As a final note: please consider what it's like to answer such a
question. You give no details about what sort of system you have,
what you've tried (do you have any docs, have you looked at them),
what device you're trying to add (odd that it <EM>must</EM> be on COM2
--- how do you know that), what OS distribution and software
you're running, etc.
<br><br>
You send a two line question which cannot be reasonably answered
in less than fifty. In IRC and on most newsgroups and mailing
lists you'd either be ignored or flamed. We're all volunteers
here and the one thing we ask is that you do your homework before
you post.
<br><br>
I'm not saying this just to sound crabby (if I was going to be
irate, I'd've just deleted this). If you don't do your homework
--- and put considerably more thought and energy into your
questions than you won't get any satisfaction out of the Linux
community.
</blockquote>
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<H5 align="center"><a href="http://www.linuxgazette.com/ssc.copying.html"
>Copyright ©</a> 1998, James T. Dennis <BR>
Published in <I>Linux Gazette</I> Issue 30 July 1998</H5>
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