Microsoft KB Archive/74551

= Can't Start MS-DOS 5.0 or later on a BSR Computer =

Article ID: 74551

Article Last Modified on 5/12/2003

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APPLIES TO


 * Microsoft MS-DOS 5.0 Standard Edition
 * Microsoft MS-DOS 5.0a
 * Microsoft MS-DOS 6.0 Standard Edition
 * Microsoft MS-DOS 6.2 Standard Edition
 * Microsoft MS-DOS 6.21 Standard Edition
 * Microsoft MS-DOS 6.22 Standard Edition

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This article was previously published under Q74551



SYMPTOMS
After installing MS-DOS or later on a BSR computer, you may be unable to start MS-DOS from the hard drive, Uninstall disk, or a MS-DOS 5.0 or later bootable floppy.



CAUSE
The BIOS chips in some BSR 386 machines prevent MS-DOS from properly completing its starting sequence.



WORKAROUND
If you are having difficulty starting MS-DOS 5.0, 6.0, or 6.2 on a BSR machine, turn off switch 2 on switch bank 1 of the system. If the machine still does not start, contact BSR for a BIOS upgrade.

NOTE: Quarterdeck Expanded Memory Manager (QEMM) does not work on the machine after this switch has been changed.



MORE INFORMATION
If you want to uninstall MS-DOS 5.0, 6.0, or 6.2, you must start from a floppy disk from your previous version of MS-DOS, back up the hard drive to floppy disks, and manually install the previous version of MS-DOS to the hard drive. To reinstall your previous version of MS-DOS, do the following:


 * 1) Use the Sys command to transfer the previous version of DOS system files to the hard drive.
 * 2) Copy the COMMAND.COM file to the root directory of drive C.
 * 3) Copy the contents of the previous version of MS-DOS disks to the DOS directory.
 * 4) Find the old AUTOEXEC.BAT and CONFIG.SYS files on the Uninstall disk as AUTOEXEC.DAT and CONFIG.DAT. Copy them to the hard drive, and rename them AUTOEXEC.BAT and CONFIG.SYS.

For more information, contact DAK Industries technical support.

The products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: 6.22 5.00 5.00a 5.0a 6.00 6.20 upgrade update 3rdparty

Keywords: KB74551

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