The following information was taken from the MS-DOS 6.2 README.TXT file.
NOTE: The MS-DOS 6.2 Upgrade and MS-DOS 6.2 Step-Up (both downloadable
and disk versions) include the same README.TXT file.
NOTES ON MS-DOS 6.2
3.1 Your computer uses a Windows 3.0 permanent swap file.
If your computer uses a Windows 3.0 permanent swap file, run
the SPATCH.BAT program to make the swap file compatible with MS-DOS 6.
To do so, carry out the following procedure:
• Copy the SPATCH.BAT file to your hard disk. To determine the location
of the file on the Setup disks, view the PACKING.LST file on Setup
• Type the following at the command prompt:
For the DRIVE and PATH parameters, specify the location of
your SWAPFILE.EXE file.
• Follow the instructions on your screen.
The program modifies the SWAPFILE.EXE for use with MS-DOS 6
and saves a backup copy as SWAPFILE.SAV. After you have confirmed
the file works correctly, you can delete the SWAPFILE.SAV file.
3.2 Using compressed floppy disks with Windows File Manager
If you are using compressed floppy disks with automounting enabled,
you might encounter error messages or other problems while using File
Manager. To work around these problems, press the F5 key twice.
For example, if you change from a compressed to an uncompressed floppy
disk, the drive button for the compressed floppy disk's host drive
remains until you press the F5 key twice.
4. HARDWARE COMPATIBILITY WITH MS-DOS
4.1 Compaq EXTDISK.SYS Driver
The Compaq EXTDISK.SYS driver version 3.00 or later is
compatible with MS-DOS 6. If you have a version earlier
than 3.00, contact your vendor for an upgrade.
To use DoubleSpace on a system that uses its Hardcard drive as its
startup drive, see section 7.18. For additional Hardcard
information, see the following:
• Hardcard II
If you can't use Plus Development Hardcard II or Hardcard
II XL when running EMM386.EXE, specify the exclude (x=)
switch to prevent EMM386 from conflicting with the card's
To configure EMM386, run MemMaker.
• Hardcard 40 or Passport
If you are using Hardcard 40 or a Passport removable
disk, and you have a DEVICE command in your CONFIG.SYS file
for PLUSDRV.SYS, disable or remove the DEVICE command.
Then run MS-DOS 6.2 Setup. After Setup is complete, reenable or
restore the DEVICE command for PLUSDRV.SYS. Make it the last line
in the file.
• If you are unable to access your compressed drive after installing
DoubleSpace on your Hardcard, try the following:
• Add a DBLSPACE /MOUNT command to your AUTOEXEC.BAT file to mount
the compressed volume file on the Hardcard every time you start
• Or, ensure that there is at least one device driver (for example,
ANSI.SYS) loaded in your CONFIG.SYS file AFTER the ATDOSXL.SYS
driver but BEFORE the DBLSPACE.SYS driver.
If you used the MS-DOS 5.0 version of EMM386 before you ran
Setup, and you use the Power Management function, use
the VRESUME program or device driver to avoid problems with
the Resume feature. Carry out the following procedure:
• Make sure the VRESUME.COM or VRESUME.SYS file is on your hard disk.
To load the TSR, add a command for VRESUME.COM to your AUTOEXEC.BAT
file. To load the device driver, add a command for the VRESUME.SYS
file to your CONFIG.SYS file.
• Save the file, and restart your computer.
NOTE For information about using VRESUME with Windows 3.0, see the
WRESUME.TXT file on your Toshiba MS-DOS 5.0 disks.
5. MICROSOFT PROGRAMS
5.1 Microsoft Anti-Virus
Before cleaning a program file, make sure you have a backup copy of it.
If you clean a program file, and the program is corrupted, reinstall the
program. If Anti-Virus again detects a virus, there is a chance the
detection is in error; contact your software vendor to determine if an
updated version of the program is available.
5.2 Running Microsoft Backup for MS-DOS under Windows
You should not run Backup for MS-DOS while Windows is running. However,
if you do, and if your system is not configured correctly, Backup
might display the following symptoms:
• Backup appears to stop running--for example, the clock runs, but
there is no disk activity.
• Backup reports problems while testing the second floppy disk during
the compatibility test. For example, it might display a "Diskette
not properly seated" message or ask for Disk 1 repeatedly.
• Windows displays a message that the DMA buffer size needs to be
• Backup quits unexpectedly.
You can correctly configure your system by carrying out the following
• Open your SYSTEM.INI file, and add a DMABufferSize=32 line to the
• When you run Backup, make sure that you specify with the Settings
command from the Control menu that Backup run with the Exclusive
and Full Screen options.
5.3 Backup for Windows stops running at the end of the compatibility
If Backup for Windows stops running at the end of the Compatibility
Test, you might be loading an incompatible third-party backup driver
in your SYSTEM.INI file. Carry out the following procedure.
NOTE This procedure disables your third-party backup program.
• Open your SYSTEM.INI file, and locate the [386Enh] section.
• Determine whether any of the following lines are included in this
• If you find any of these lines, add a semicolon (;) to the front
of the line.
• Save the file, restart Windows, and run Backup for Windows again.
5.4 Running Microsoft Backup with TI4000 and Gateway NOMAD computers
To avoid a conflict between the Turbo feature and Microsoft Backup
for Windows or MS-DOS, add a /L0
switch to the DEVICE command in
your CONFIG.SYS that loads the BATTERY.PRO file. Or, before you
run Microsoft Backup, type SETPOWER /L0
at the command prompt.
5.5 Microsoft Defragmenter
If you received the "Insufficient Memory" message from Microsoft
Defragmenter, use the MEM command to determine how much conventional,
upper, and extended (XMS) memory is available. In addition to using
all available conventional memory, Defragmenter can make use of up
to 384K of extended memory and 12K of upper memory.
To increase available memory, carry out the procedures in "An MS-DOS
program displays an out-of-memory message" in the chapter "Diagnosing
and Solving Problems" in the MICROSOFT MS-DOS 6 USER'S GUIDE.
If less than 384K of extended memory is available, carry out
the procedures in "Freeing Extended Memory" in the "Making More
Memory Available" chapter in the MICROSOFT MS-DOS 6 USER'S GUIDE.
6. THIRD-PARTY PROGRAMS
6.1 4DOS and NDOS
4DOS and NDOS are compatible with MS-DOS 6. However, to use some of the
new features in MS-DOS 6.2 (such as MemMaker, the LOADHIGH /L switch,
DIR compression switches, and the ability to bypass startup commands),
contact JP Software to obtain 4DOS 4.02 or later, or Symantec to obtain
Norton Utilities 7.0 or later.
If you use multiple configurations, 4DOS or NDOS will not automatically
run your AUTOEXEC.BAT file unless you include a /P on the SHELL line in
your CONFIG.SYS file.
To use MS-DOS 6.2 Help instead of 4DOS or NDOS Help, start it by using
COMMAND /C HELP, or define a 4DOS or NDOS alias to run HELP.COM from
your MS-DOS 6.2 directory.
6.2 Above Board 286 and Above Board Plus Installation
Do not use an Above Board installation program dated May 1989
or earlier until you disable programs that use extended memory,
such as SMARTDrive or RAMDrive. You might lose data if you leave
these programs enabled. After you have installed Above Board,
you can reenable these programs.
CAUTION Using versions 3.0 to 3.13 of the CodeView CV.EXE
file may cause data loss if your system has an 80386 memory
manager (such as EMM386.EXE) and device drivers or programs
that use extended memory. To determine which version you
have, type CV.EXE
at the command prompt.
6.4 Colorado Tape Backup
If you receive a message that you have two versions of the
VFINTD.386 file loaded, you probably need to edit your
SYSTEM.INI file. To do so, carry out the following procedure:
• Open your SYSTEM.INI file and locate the [386Enh] section.
You should see two lines similar to the following:
• If you plan to use your Colorado Tape Backup program, add a semi-
colon (;) before the DEVICE command for the VFINTD.386 file. If you
plan to use Microsoft Backup, add a semi-colon before the DEVICE
command for the CMSDTAPE.386 file.
• Save the file, and restart Windows.
6.5 Fastback Plus
If you have a version of Fifth Generation Systems Fastback Plus earlier
than 3.0, use the LOADFIX command before running Fastback Plus or the
Fastback Plus installation program to ensure that you don't lose data. To
do so, type the following at the command prompt:
6.6 Norton Desktop for Windows 2.0
Setup adds a second Tools menu which contains Microsoft Backup and
Antivirus commands (if you installed these Windows programs),
as well as a DoubleSpace Info command (if DoubleSpace is installed).
If you use DoubleSpace to compress the drive that contains
SmartCan, you might experience system problems afterward.
To correct this, reinstall Norton Desktop for Windows.
For information about Norton AntiVirus and DoubleSpace,
see the following section.
6.7 Norton Utilities
The "Clear Space" option of Norton Speed Disk (prior to version 7.0)
is incompatible with DoubleSpace drives. For an updated version of
Norton Speed Disk, contact your software vendor.
Do not use the WipeInfo utility on DoubleSpace drives. It can cause
lost clusters. If you have already used this option, use the
SCANDISK command to fix the lost clusters.
If Norton AntiVirus is running when you use DoubleSpace to compress
the drive that contains the NAV_.SYS file, DoubleSpace leaves a copy
of the NAV_.SYS file on the host drive. This prevents Norton AntiVirus
from reporting a virus infection during the compression process. After
the compression process is complete, you can safely delete the copy of
NAV_.SYS on the host drive.
If you use the Norton Cache or Speedrive utilities, load the utility
after the DEVICE command that loads DBLSPACE.SYS. For more information,
see section 7.24.
6.8 PC Tools
If PC Shell does not show all of the files or directories on your drive,
quit PC Shell immediately and contact Central Point Software for an
CAUTION: Do not attempt to use PC Shell on that drive; severe data
loss might occur. This problem affects both compressed and
The DISKFIX /SCAN option in PC Tools can cause lost clusters on
DoubleSpace drives. Avoid using this option. (If you have already
used this option, use ScanDisk to fix the lost clusters.)
The FORMAT command of PC Tools version 7.1 conflicts with
MS-DOS 6.2. Use the FORMAT command that comes with MS-DOS 6.2.
The COMPRESS command of PC Tools versions 6.0 and 5.5
is incompatible with DoubleSpace.
6.9 QEMM's Stealth DoubleSpace Feature
The Stealth DoubleSpace feature of QEMM 7.01 is incompatible with
MS-DOS 6.2. Version 7.02 is compatible with MS-DOS 6.2, but not
with DEFRAG.EXE or DoubleSpace's Automount feature. Version 7.03
is fully compatible with MS-DOS 6.2 and DoubleSpace; it is available
to all QEMM 7 users through bulletin board systems such as BIX,
CompuServe, and QuarterDeck BBS, as well as directly from QuarterDeck
If you use the Stealth DoubleSpace feature of QEMM version 7.01
or 7.02, see the appropriate section below.
QEMM version 7.01
The Stealth DoubleSpace feature of QEMM 7.01 is incompatible with
MS-DOS 6.2. If you use QEMM version 7.01 and the Stealth DoubleSpace
feature, your computer will not start properly.
To work around this problem, press F8 when your computer starts.
Answer Y to all prompts except the following:
When MS-DOS displays this prompt, answer N. (The pathname for
ST-DBL.SYS may be different on your computer.) After your computer
starts, edit your CONFIG.SYS file and make the following changes:
• Disable the DEVICE command for ST-DBL.SYS by using the REM command.
• Add a DEVICE command for DBLSPACE.SYS. For example:
QEMM version 7.02
The Stealth DoubleSpace feature of QEMM version 7.02 is compatible
with MS-DOS 6.2, with the following exceptions:
• You cannot use QEMM version 7.02's Stealth DoubleSpace feature
while DoubleSpace's Automount feature is enabled. To turn
Automounting off, type DBLSPACE /AUTOMOUNT=O at the command prompt,
and then restart your computer.
• You cannot run the Microsoft Defragmenter (DEFRAG.EXE) while QEMM
version 7.02's Stealth DoubleSpace driver is installed. To run
DEFRAG.EXE, disable the Stealth DoubleSpace driver, and then restart
your computer. After you finish running DEFRAG.EXE, you can reenable
the Stealth DoubleSpace driver and restart your computer.
6.10 Johnson Computer Systems PC-Vault and PC-Vault Plus
If you use version 4.6 or earlier of the PC-Vault or PC-Vault Plus
hard disk protection system, do not use the Maximum Floppy
Boot Protection option if you use DoubleSpace.
In these versions of PC-Vault and PC-Vault plus, the Maximum Floppy
Boot Protection option is incompatible with DoubleSpace and may
cause data loss. If your version of PC-Vault or PC-Vault Plus
is earlier than 4.6, contact Johnson Computer Systems for an upgrade.
6.11 AddStor Double Tools
AddStor's Double Tools version 1.0 includes a version of DBLSPACE.BIN
that is incompatible with MS-DOS 6.2. When you install Double Tools,
do not check the "Install enhanced DoubleSpace drivers" box.
If you do, Double Tools will replace the MS-DOS 6.2 DBLSPACE.BIN
file with the Double Tools version of DBLSPACE.BIN. The next time you
start your computer, it will display the message "Wrong DBLSPACE.BIN
version" and none of your compressed drives will be mounted.