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  Microsoft(R) Product Support Services Application Note (Text File)
        PD0748: BACKUP AND MISCELLANEOUS QUESTIONS AND ANSWERS
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                                                   Revision Date: 4/94
                                                      No Disk Included

The following information applies to Microsoft MS-DOS(R), version 6.0
Upgrade.

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1.  Q. My computer failed the Microsoft Backup compatibility
       test. What is causing this problem and how can I correct it?
    
    A. One or more of the following conditions may cause your computer
       to fail the Microsoft Backup compatibility test:
    
     - The floppy disk drive controller card does not support direct
       memory access (DMA).
    
     - A software or hardware compatibility problem exists (for
       example, you are loading APPEND.EXE, POWER.EXE, or other
       incompatible software).
    
     - You are using an incompatible third-party virtual device driver
       (VxD) in Windows.
    
       When loaded in the [386Enh] section of the SYSTEM.INI file, the
       following software VxDs can cause the Microsoft Backup for
       Windows(TM) compatibility test to fail:
    
          ABACKUP.386
          CMSDTAPE.386
          CMSTAPE.386
          CMSTAPED.386
          CPBVXD.386
          FASTBACK.386
          MYABU.386
          VFD.386
          VIRWT.386
    
       For a complete list of possible failure causes and steps to
       troubleshoot them, order FastTips Technical Library item
       Q97577, titled "Your Computer Fails the Microsoft Backup
       Compatibility Test."
    
2.  Q. When I try to use Microsoft Backup for MS-DOS, I receive
       the message "DMA Buffer Size Too Small." How can I correct this
       problem?

    A. You can correct this problem by increasing the size of the
       direct memory access (DMA) buffer used by EMM386.EXE. To do
       this, use the following steps:
    
       1. Use an ASCII text editor, such as MS-DOS Editor, to open
          your CONFIG.SYS file.
       
       2. Locate the EMM386.EXE command line.
        
       3. At the end of the EMM386.EXE command line, add the
          following parameter:
       
             D=64
       
       4. Save the CONFIG.SYS file, then quit the text editor.
       
       5. Restart your computer.
       
       For more information about Microsoft Backup for MS-DOS, refer
       to the "Managing Your System" chapter in the "Microsoft MS-DOS
       6 User's Guide."

3.  Q. When I try to use Microsoft Backup for Windows, I receive
       the message: "DMA Buffer Size Too Small." How can I correct
       this problem?

    A. You can correct this problem by increasing the size of the DMA
       buffer used by the extended memory manager and then modifying
       your system initialization file (SYSTEM.INI). To do this, use
       the following steps:
    
       1. Use an ASCII text editor, such as MS-DOS Editor, to open
          your CONFIG.SYS file.
       
       2. Locate the EMM386.EXE command line.
       
       3. At the end of the EMM386.EXE command line, add the following
          parameter:
       
             D=64
       
       4. Save the CONFIG.SYS file, then quit the text editor.
       
       5. Use an ASCII text editor to open your SYSTEM.INI file, which
          is located in your Windows directory.
       
       6. Locate the [386Enh] section and add the following line after
          the section heading:

             DMABuffersize=64

       7. Save the changes to the SYSTEM.INI file, then quit the text
          editor.
       
       8. Quit Windows if you haven't already done so, and restart
          your computer.
    
       For more information about Microsoft Backup for Windows, please
       refer to the "Managing Your System" chapter in the "Microsoft
       MS-DOS 6 User's Guide."