Upgrading to MS-DOS 5.0 over Stacker (73672)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
This article was previously published under Q73672
If you have STAC Electronics Stacker 1.0 installed on your machine and
you want to upgrade to MS-DOS version 5.0, follow the procedure below.
If any of these steps fail, please contact STAC Electronics technical
support by calling (619) 431-6712 or faxing (619) 431-1073.
If you Stacker version 2.0 or later, follow the instructions in your
Stacker manual to update to MS-DOS 5.0. If you have Stacker version
1.1 or earlier, obtain an automatic update utility from Stac
To upgrade your machine to MS-DOS 5.0, do the following:
• IMPORTANT: Back up your hard drive. This is for your benefit.
• Install MS-DOS 5.0 to floppy disks with the SETUP /F command.
• Determine which drive is your boot drive using the following
• Remove any disk from drive A and reboot the machine.
• Insert the Stacker disk in drive A.
• Type A:\SWAPMAP.
• Record the drive letter that "was drive C: at boot time."
For example, in the following sample display of SWAPMAP,
drive D is the one you are looking for:
Drive A: was drive A: at boot time
Drive B: was drive B: at boot time
Drive C: was drive D: at boot time [D:\STACVOL.000 = 16.0MB]
Drive D: was drive C: at boot time
• Transfer the system files to the hard drive. Insert the MS-DOS 5.0
Support disk (5.25-inch) or Startup/Support disk (3.5-inch) in the
Type SYS x:, where x is the drive
that is swapping with drive C. In the above example, this is drive
D. If you are not swapping drives, type C:. If you are requested
to "Insert the system disk in drive A:", insert the Startup disk.
If SWAPMAP gives the output "Drive C: was Drive C: at boot time,"
go to step 6.
• Note: The MS-DOS SYS command will NOT work on Stacker volumes.
This step accomplishes the same thing as the SYS command.
• Remove the MS-DOS 5.0 Startup or Startup/Support disk and
insert the Stacker disk.
• In the following commands, x represents the drive that is
swapped with drive C. If you are using an IBM version of DOS,
the system files are named IBMBIO.COM, and IBMDOS.COM. Use these
in place of IO.SYS and MSDOS.SYS. Type the following commands:
sattrib -r -s -h c:\io.sys
sattrib -r -s -h c:\msdos.sys
sattrib -r -s -h x:\io.sys
sattrib -r -s -h x:\msdos.sys
copy x:\io.sys c:\
copy x:\msdos.sys c:\
copy x:\command.com c:\
sattrib +r +s +h c:\io.sys
sattrib +r +s +h c:\msdos.sys
sattrib +r +s +h x:\io.sys
sattrib +r +s +h x:\msdos.sys
• Copy MS-DOS files as needed.
• Remove the Stacker disk and insert the Startup or
• Use the COPY command to copy some or all of the files to your
hard disk. It is a good idea to put the MS-DOS version 5.0 files
in the same directory in which you stored your previous MS-DOS
files. If you copy the MS-DOS 5.0 files to a different
directory, the paths in the CONFIG.SYS and AUTOEXEC.BAT files
will be incorrect.
• Insert each of the remaining working disks in the disk drive and
copy the files you want. Remember, there will be a DOS directory
on the Stacker volume as well as on the uncompressed drive. Make
sure you include a copy of COMMAND.COM in your DOS
The product included here, Stacker, is manufactured by a vendor
independent of Microsoft; we make no warranty, implied or otherwise,
regarding this product's performance or reliability.
technical support: Phone (619) 431-6712
Fax (619) 431-1073
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