2
<!DOCTYPE article PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN"
4
<!ENTITY % addindex "IGNORE">
5
<!ENTITY % English "INCLUDE" > <!-- change language only here -->
8
<article lang="&language;">
9
<title>I/O Port</title>
13
<author>&Matthias.Hoelzer-Kluepfel;</author>
14
<author>&Helge.Deller;</author>
15
<author>&Duncan.Haldane;</author>
16
<author>&Mike.McBride;</author>
18
<!-- TRANS:ROLES_OF_TRANSLATORS -->
21
<date>2002-02-12</date>
22
<releaseinfo>3.00.00</releaseinfo>
25
<keyword>KDE</keyword>
26
<keyword>KControl</keyword>
27
<keyword>ioports</keyword>
28
<keyword>system information</keyword>
33
<title>Input/Output Port Information</title>
35
<para>This page displays information about the I/O ports.</para>
37
<para>I/O Ports are memory addresses used by the processor for direct
38
communication with a device that has sent an
39
interrupt signal to the processor.</para>
41
<para>The exchange of commands or data between the processor and the device
42
takes place through the I/O port address of the device, which is a
44
number. No two devices can share the same I/O port. Many devices use
46
I/O port addresses, which are expressed as a range of hexadecimal
49
<note><para>The exact information displayed is system-dependent. On some
50
systems, I/O port information can not yet be displayed.</para></note>
52
<para>On &Linux;, this information is read from <filename
53
class="devicefile">/proc/ioports</filename> which is only available if
54
the <filename class="devicefile">/proc</filename> pseudo-filesystem is
55
compiled into the kernel. A list of all currently-registered I/O port
56
regions that are in use is shown.</para>
58
<para>The first column is the I/O port (or the range of I/O ports), the
59
second column identifies the device that uses these I/O ports.</para>
61
<para>The user cannot modify any settings on this page.</para>