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AMIBIOS8 Check Point and Beep Code List
Version 1.2, Last Updated 1 October 2002

American Megatrends, Inc. AMIBIOS8 Check Point and Beep Code List
Copyright (c) 2002 American Megatrends, Inc. All Rights Reserved. American Megatrends, Inc. 6145-F, Northbelt Parkway Norcross, GA - 30071, USA This publication contains proprietary information which is protected by copyright. No part of thispublication may be reproduced, transcribed, stored in a retrieval system, translated into any language or computer language, or transmitted in any form whatsoever without the prior written consent of the publisher, American Megatrends, Inc. American Megatrends, Inc. retains the right to update, change, modify this publication at any time, without notice. For Additional Information Call AmericanMegatrends BIOS Sales Department at 1-800-828-9264 for additional information. Limitations of Liability In no event shall American Megatrends be held liable for any loss, expenses, or damages of any kind whatsoever, whether direct, indirect, incidental, or consequential, arising from the design or use of this product or the support materials provided with the product. Limited Warranty No warranties aremade, either express or implied, with regard to the contents of this work, its merchantability, or fitness for a particular use. American Megatrends assumes no responsibility for errors and omissions or for the uses made of the material contained herein or reader decisions based on such use. Trademark and Copyright Acknowledgments All product names used in this publication are for identificationpurposes only and are trademarks of their respective Companies.

Revision Information
Date 7 May 2002 8 May 2002 1 Oct 2002 Rev 1.0 1.1 1.2 Description of Changes First Public Release for AMIBIOS8 Added beep code troubleshooting information. Added CPU and ACPI POST codes Editor B. Richardson B. Richardson D. Holmberg

Copyright 2002

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American Megatrends, Inc. AMIBIOS8 CheckPoint and Beep Code List

Table of Contents
1 INTRODUCTION
1.1 1.2 1.3 About This Document Checkpoints and Beep Codes Viewing BIOS Checkpoints

4
4 4 4

2 3 4 5 6 7

BOOTBLOCK INITIALIZATION CODE CHECKPOINTS BOOTBLOCK RECOVERY CODE CHECKPOINTS POST CODE CHECKPOINTS DIM CODE CHECKPOINTS ACPI RUNTIME CHECKPOINTS BEEP CODES
7.1 Troubleshooting BIOS Beep Codes

5 6 7 9 11 12
12Copyright 2002

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American Megatrends, Inc. AMIBIOS8 Check Point and Beep Code List

1 Introduction
1.1 About This Document
This document lists checkpoints and beep codes generated by AMIBIOS. This document was last revised at the release of AMIBIOS8 Core 8.00.04. This covers AMIBIOS products released before May 2002. The checkpoints defined in this document are inherent to theAMIBIOS generic core, and do not include any chipset or board specific checkpoint definitions.

1.2 Checkpoints and Beep Codes
A checkpoint is either a byte or word value output to I/O port 80h. The BIOS outputs checkpoints throughout bootblock and Power-On Self Test (POST) to indicate the task the system is currently executing. Checkpoints are very useful in aiding software developers ortechnicians in debugging problems that occur during the pre-boot process. Beep codes are used by the BIOS to indicate a serious or fatal error to the end user. Beep codes are used when an error occurs before the system video has been initialized. Beep codes will be generated by the system board speaker, commonly referred to as the “PC speaker.”

1.3 Viewing BIOS Checkpoints
Viewing all checkpointsgenerated by the BIOS requires a checkpoint card, also referred to as a “POST Card” or “POST Diagnostic Card”. These are ISA or PCI add-in cards that show the value of I/O port 80h on a LED display. Checkpoint cards are available through a variety of computer mail-order outlets. Some computers using AMIBIOS display checkpoints in the bottom right corner of the screen during POST. This display...