Microsoft^® Windows^® 95 Update for AMD-K6^®-2/350 and Above

Patch for Windows 95 OEM SR2 and above

Please note that this patch will not resolve issues associated with any other versions of Windows 95 other than the OEM SR2 version. If you have any other version other than OEM SR2, please contact technical support for further options available to you. To determine the version that you have on your system, please read below.

If you are not sure which version of Windows 95 you have, you can find out simply by checking your System Properties. To do this, right mouse click on "My Computer" and select "Properties". An OEM SR2 system will show a designator, such as "4.00.9500 B" as the version. The number may vary slightly, but the letter designator will be a "B" for the OSR2 version. Version designators without a "B", such as an "A" or nothing after the number, cannot utilize this patch. For these versions, please contact technical support for further assistance to resolve this issue.

Problem(s) this Update Resolves

When you are starting Windows 95 OSR2, OSR2.1, or OSR2.5 on a computer with an AMD-K6-2 processor running at speeds of 350 MHz and above, you may receive one of the following error messages:

• Device IOS failed to initialize.
• Windows Protection Error.
• You must reboot your computer.

The first error is a result of a divide exception in IOS.VXD, the second is due to a similar error within ESDI_506.PDR or SCSIPORT.PDR.

This observation is caused by a software timing loop that is sensitive to processor frequency, and is not a processor erratum. This DOES NOT occur with Windows 98 or Windows NT®. AMD has worked closely with Microsoft to enable a publicly available solution which is available below.

This problem is very intermittent at 350MHz. Note that it is necessary to reboot the computer after the error occurs. If the error does not occur, the system will run normally.

Microsoft Knowledge Base reference article(s): Q192841 AMD K6-2/350 CPU Windows Protection Error at boot time.

How to Install

1. If you agree with the Software Usage Terms set forth below, please press the "Accept" button to begin the download process. If you do not agree with the Software Usage Terms, press the "Decline" button.
2. Copy the file AMDK6UPD.EXE into an empty folder, and run AMDK6UPD.EXE to install the update.
3. You may be warned that you are about to replace a newer file with an older version of the file. Generally, you should the keep the newer file, and choose not to replace it with an older file.
4. Restart the computer for the changes to take effect.

How to Uninstall

1. Using Windows Explorer, locate the file AMDK6_UN.INF in the Windows\INF\QFE folder, right-click on the file AMDK6_UN.INF, and choose Install.
2. You will be prompted for the Windows 95 installation CD or diskettes. Choose the appropriate path.
3. You may beprompted to replace the newer file with an older version of the file. To uninstall this update, choose to Replace the newer file.
4. Restart the computer for the changes to take effect.

File Information

Windows 95 Version 4.00.950 B (OSR 2 & OSR 2.1):

Software Usage Terms

IMPORTANT: The enclosed software includes a software patch. THIS IS A LEGAL AGREEMENT BETWEEN YOU (EITHER AN INDIVIDUAL OR AN ENTITY) AND MICROSOFT AND/OR ADVANCED MICRO DEVICES, INC. ("AMD"). USING THIS SOFTWARE CONSTITUTES ACCEPTANCE OF THE TERMS AND CONDITIONS SET FORTH IN THIS AGREEMENT. IF YOU AGREE TO THE TERMS AND CONDITIONS OF THIS AGREEMENT, PRESS THE "ACCEPT" BUTTON BELOW. IF YOU DO NOT AGREE TO THE TERMS AND CONDITIONS OF THIS AGREEMENT OR HAVE QUESTIONS REGARDING THIS AGREEMENT, PRESS THE "DECLINE" BUTTON BELOW.

I. Microsoft Terms

The disk and software contained on it, including any accompanying documentation ("the Software"), are provided to you at no additional charge. Microsoft Corporation owns all right, title and interest to the Software. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, MICROSOFT AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTBILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH REGARD TO THE SOFTWARE. The Software is provided with RESTRICTED RIGHTS. Use, duplication, or disclosure by the Government is subject to restrictions set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013 or subparagraphs (c)(1) and (2) of the Commercial Computer Software--Restricted Rights at 48 CFR 52.227-19, as applicable. Manufacturer is Microsoft Corporation, One Microsoft Way, Redmond, WA 98052-6399. Any transfer of this Software must be accompanied by this statement and may only be transferred if first approved by Microsoft.
(c) 1995-1997 Microsoft Corporation, All Rights Reserved.

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This Software is intended to be used with Microsoft software. You remain subject to the original terms and conditions of any agreement you have with Microsoft about the use of their software. You are responsible for ensuring that your use of the Software provided by AMD with the Microsoft software is not in violation of any such agreement.

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• AMD does not warrant, guarantee, or make any representations as to the correctness, accuracy, or reliability of the Software. AMD does not warrant that operation of the Software will be uninterrupted or error-free. YOU ARE SOLELY RESPONSIBLE FOR DETERMINING THE APPROPRIATENESS OF USING THE SOFTWARE AND ASSUME ALL RISKS ASSOCIATED WITH THE USE OF THE SOFTWARE, INCLUDING BUT NOT LIMITED TO THE RISKS OF PROGRAM ERRORS, DAMAGE TO OR LOSS OF DATA, PROGRAMS, OR EQUIPMENT, AND UNAVAILABILITY OR INTERRUPTION OF OPERATIONS. Some jurisdictions do not allow for the exclusion or limitation of implied warranties, so the above limitations or exclusions may not apply to you.

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EXPORT. You shall comply with any applicable laws regarding the use, export or re-export of the Software and any other information contained herein, including all applicable regulations of the U.S. Department of Commerce and/or the U.S. State Department.

GOVERNMENT USERS. If you are a U.S. Government user, then the Software is provided with "RESTRICTED RIGHTS" as set forth in subparagraphs (c)(1) and (2) of the Commercial Computer Software-Restricted Rights clause at FAR 52.227-19 or subparagraph (c) (1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.277-7013, as applicable.

© Copyright 1998 Advanced Micro Devices, Inc. All rights reserved.