<?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 % 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>