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<?xml version="1.0" ?>
<!DOCTYPE article PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN"
"dtd/kdex.dtd" [
<!ENTITY % addindex "IGNORE">
<!ENTITY % English "INCLUDE" > <!-- change language only here -->
]>
<article lang="&language;">
<title>I/O Port</title>
<articleinfo>
<authorgroup>
<author>&Matthias.Hoelzer-Kluepfel;</author>
<author>&Helge.Deller;</author>
<author>&Duncan.Haldane;</author>
<author>&Mike.McBride;</author>
<!-- TRANS:ROLES_OF_TRANSLATORS -->
</authorgroup>
<date>2002-02-12</date>
<releaseinfo>3.00.00</releaseinfo>
<keywordset>
<keyword>KDE</keyword>
<keyword>KControl</keyword>
<keyword>ioports</keyword>
<keyword>system information</keyword>
</keywordset>
</articleinfo>
<sect1>
<title>Input/Output Port Information</title>
<para>This page displays information about the I/O ports.</para>
<para>I/O Ports are memory addresses used by the processor for direct
communication with a device that has sent an
interrupt signal to the processor.</para>
<para>The exchange of commands or data between the processor and the device
takes place through the I/O port address of the device, which is a
hexadecimal
number. No two devices can share the same I/O port. Many devices use
multiple
I/O port addresses, which are expressed as a range of hexadecimal
numbers. </para>
<note><para>The exact information displayed is system-dependent. On some
systems, I/O port information can not yet be displayed.</para></note>
<para>On &Linux;, this information is read from <filename
class="devicefile">/proc/ioports</filename> which is only available if
the <filename class="devicefile">/proc</filename> pseudo-filesystem is
compiled into the kernel. A list of all currently-registered I/O port
regions that are in use is shown.</para>
<para>The first column is the I/O port (or the range of I/O ports), the
second column identifies the device that uses these I/O ports.</para>
<para>The user cannot modify any settings on this page.</para>
</sect1>
</article>
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