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