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