Microsoft KB Archive/309308

= ACPI Bios Tries to Write to an Illegal I/O Port Address =

Q309308

-

The information in this article applies to:


 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional

-

SYMPTOMS
When you view the entries in Event Viewer, you may see one or more &quot;Error acpi&quot; entries with the following details:

AMLI: ACPI Bios is attempting to write to an illegal IO port address (0x80). This machine has suffered a fatal error and needs to be shutdown as quickly as possible. Please contact your system vendor for technical assistance.

CAUSE
This behavior can occur because Windows XP prevents access to ports that your BIOS may try to write to in the Active Messaging Library. This helps to improve the stability of the operating system. Notification of this behavior is provided in an event log message.

RESOLUTION
To work around this behavior, contact the manufacturer of your BIOS to obtain the most current BIOS revision for your computer.

STATUS
This behavior is by design.

Additional query words: aml

Keywords : kbenv kberrmsg kbhw kbtool

Issue type : kbprb

Technology : kbWinXPProSearch kbWinXPHomeSearch kbWinXPSearch

-

[mailto:MSDN@MICROSOFT.COM Send feedback to Microsoft]

© 2002 Microsoft Corporation. All rights reserved.