<?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>