Windows 95 Software Update:

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File Information:
=================

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

   ----File----  -Version-  ----Date/Time----  ----Size-----
   ESDI_506.PDR  4.00.1118  09/04/98 11:18 am   24,426 bytes
     HSFLOP.PDR  4.00.1113  08/03/98 11:13 am   25,249 bytes
   SCSIPORT.PDR  4.00.1112  09/04/98 11:12 am   23,158 bytes
       CDFS.VXD  4.00.1112  01/15/97 11:12 am   59,153 bytes
    DISKTSD.VXD  4.00.1112  01/15/97 11:12 am   18,809 bytes
      INT13.VXD  4.00.1112  01/15/97 11:12 am    9,955 bytes
        IOS.VXD  4.00.1113  09/04/98 11:13 am   68,962 bytes
   VFBACKUP.VXD  4.00.1114  05/25/99 11:14 am   18,197 bytes

Windows 95 Version 4.00.950 B (OSR 2.1 only):

   ----File----  -Version-  ----Date/Time----  ----Size-----
     NTKERN.VXD  4.03.1213  12/04/98 12:13 pm  111,678 bytes


Note that an earlier version of this update installed the below
version of VBACKUP.VXD in the %windir%\system\VMM32 directory:

   ----File----  -Version-  ----Date/Time----  ----Size-----
   VFBACKUP.VXD  4.00.1112  01/15/97 11:12 am   18,197 bytes

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.

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

Additionally, if you are using Microsoft Backup to back up data to certain models
of floppy disk drives, you may receive the following error messages:

   Warning: Tape needs to be erased before operation can proceed.

   Microsoft Backup unable to read from the disk or network drive. Quit and
   restart Backup, and then try again.

   Warning: This operation has been canceled by the system.


Microsoft Knowledge Base reference article(s):
Q192841  AMD K6-2/350 CPU Windows Protection Error at boot time
Q159153  Error Messages While Backing Up to Some Floppy Disk Drives
Q234259  Revision To AMD K6-2/350 Central Processing Unit Update

How to Install:
===============
1. Copy the file AMDK6UPD.EXE into an empty folder, and run AMDK6UPD.EXE 
   to install the update.

2. 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.

3. 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 be prompted 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.