Can't Start MS-DOS 5.0 or later on a BSR Computer (74551)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
• Microsoft MS-DOS operating system 5.0a
• Microsoft MS-DOS operating system 6.0
• Microsoft MS-DOS operating system 6.2
• Microsoft MS-DOS operating system 6.21
• Microsoft MS-DOS operating system 6.22
This article was previously published under Q74551
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
The BIOS chips in some BSR 386 machines prevent MS-DOS from properly
completing its starting sequence.
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.
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:
• Use the Sys command to transfer the previous version of DOS system
files to the hard drive.
• Copy the COMMAND.COM file to the root directory of drive C.
• Copy the contents of the previous version of MS-DOS disks to the
• 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.
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