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<!DOCTYPE article PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN"
"dtd/kdex.dtd" [
<!ENTITY % addindex "IGNORE">
<!ENTITY % British-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>

<othercredit role="translator"
><firstname
>Malcolm</firstname
><surname
>Hunter</surname
><affiliation
><address
><email
>malcolm.hunter@gmx.co.uk</email
></address
></affiliation
><contrib
>Conversion to British English</contrib
></othercredit
> 
</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>
