MORE INFORMATION
README.TXT
MS-DOS 6.21 does not include data compression. It differs from MS-DOS 6.2
as follows:
• DoubleSpace is not included. For more information, see Section 7
of this file.
• ScanDisk will not run on DoubleSpace drives unless DoubleSpace is
installed (that is, DBLSPACE.BIN is loaded in memory).
• The Backup programs do not compress data while backing up, and cannot
restore compressed backups made by previous versions of Microsoft
Backup. (By default, Setup does not replace your current version of
Backup, if any). For more information, see section 5.5 of this file.
NOTES ON MS-DOS 6.21
This file provides important information not included in the
MICROSOFT MS-DOS USER'S GUIDE or in MS-DOS Help.
This file is divided into the following major sections:
• Setup
• MemMaker, EMM386, and Memory Management
• Windows
• Hardware Compatibility with MS-DOS 6.21
• Microsoft Programs
• Third-Party Programs
• DoubleSpace
If the subject you need information about doesn't appear in
this file, you might find it in one of the following text
files included with MS-DOS:
• OS2.TXT, which describes how to remove and save data on your
computer when you replace OS/2 with MS-DOS 6.21.
• NETWORKS.TXT, which describes how to update your network software
for use with MS-DOS 6.21.
For information about new features, type
HELP WHATSNEW at the command
prompt.
This file contains the following topics:
• Setup
1.1 SpeedStor
1.2 Incompatible Hard Disk or Device Driver
1.3 AT&T 6300 Computer
1.4 Toshiba with a Hard RAM Disk
1.5 Tandy with ROM DOS
1.6 Setup displays the "Your computer uses a disk-compression
program that is incompatible with Setup" message.
1.7 You deleted files from the directory that Setup needs
to install the optional Windows programs.
1.8 Running Setup if Your Computer Uses Windows NT
1.9 Setup detects that your computer has a non-MS-DOS
partition or non-MS-DOS files, and your computer uses Windows NT.
1.10 Setup displays the "Your computer uses password protection"
screen.
1.11 Setup displays the "Your computer is using an incompatible
delete-protection program" screen.
1.12 Setup detects that your computer uses DR DOS.
1.13 Installing MS-DOS on a Drive Other Than C
1.14 Bypassing the Uninstall Disk and Using Default Setup Options
1.15 Installing MS-DOS on a System with a CorelSCSI UNI_ASP.SYS Driver
1.16 Installing MS-DOS if you have DrivePro or EZ-Drive
1.17 Setup displays the "There is not enough disk space" screen
and you are running PC-DOS version 6.1
1.18 Setup cannot update a file
1.19 Upgrading from PC-DOS 6.1
• MemMaker, EMM386, and Memory Management
2.1 Intel Expanded-Memory Driver (EMM.SYS)
2.2 Running MemMaker on a Computer with PC-NFS
2.3 You have a Super VGA display and want to conserve memory.
2.4 Using MemMaker with IBM LAN
2.5 MemMaker and Adaptec SCSI devices
2.6 Running MemMaker on a computer with PC Tools RAMBoost
2.7 EMM386 detects an error in an application
2.8 MemMaker no longer aggressively scans upper memory by default
• Windows
3.1 Your computer uses a Windows 3.0 permanent swap file.
3.2 Using compressed floppy disks with Windows File Manager
• Hardware Compatibility with MS-DOS 6.21
4.1 Compaq EXTDISK.SYS Driver
4.2 Hardcard
4.3 Toshiba
• Microsoft Programs
5.1 Microsoft Anti-Virus
5.2 Running Microsoft Backup for MS-DOS under Windows
5.3 Backup for Windows stops running at the end of the
compatibility test
5.4 Running Microsoft Backup with TI4000 and Gateway NOMAD computers
5.5 MS-DOS 6.21 Backup Cannot Restore 6 or 6.2 Backups
5.6 Microsoft Defragmenter
• Third-party Programs
6.1 4DOS and NDOS
6.2 Above Board 286 and Above Board Plus Installation
Programs
6.3 CodeView
6.4 Colorado Tape Backup
6.5 Fastback Plus
6.6 Norton Desktop for Windows 2.0
6.7 Norton Utilities
6.8 PC Tools
6.9 QEMM's Stealth DoubleSpace Feature
6.10 Johnson Computer Systems PC-Vault and PC-Vault Plus
6.11 AddStor DoubleTools
• DoubleSpace
7.1 Converting Your XtraDrive Disk-Compression Software
to DoubleSpace
7.2 Converting Stacker 3.1 Software to DoubleSpace
7.3 Converting Other Disk-Compression Software to DoubleSpace
7.4 DoubleSpace Setup indicates that your computer is running an
incompatible disk-caching program.
7.5 Your compressed drive runs out of disk space.
7.6 Your uncompressed (host) drive runs out of disk space.
7.7 DoubleSpace did not compress all of your files because
the drive ran out of disk space.
7.8 Windows displays the message "The permanent swap file is corrupt."
7.9 EXTDISK.SYS displays a warning about drive letters.
7.10 You need a special device driver to use your startup drive.
7.11 Defragmenting uncompressed drives after changing file attributes
7.12 Files DoubleSpace cannot compress
7.13 Microsoft Defragmenter runs out of memory while you are
compressing a drive.
7.14 DoubleSpace and PC-Vault
7.15 Maximum size of a compressed drive
7.16 DoubleSpace could not mount a drive due to problems with the drive
7.17 DoubleSpace finishes installation, but you cannot access your
Hardcard.
7.18 You receive a DoubleGuard Alarm message
7.19 A compressed drive is currently too fragmented to mount
7.20 DoubleSpace displays the message "Your computer is running with an
incompatible version of DBLSPACE.BIN"
7.21 Using the DBLSPACE command after bypassing DBLSPACE.BIN
7.22 Removing the write-protection from a compressed floppy disk
7.23 Automounting and Norton Disk Cache
7.24 Undelete utilities and DoubleSpace
7.25 Creating an Emergency Startup Disk for DoubleSpace Systems
7.26 If ScanDisk Cannot Check or Repair a DoubleSpace Volume File
1. SETUP
1.1 SpeedStor
If Setup referred you to this section and your computer has an OS/2
partition created by using the FDISKPM utility in OS/2 2.1, run
MS-DOS Setup by typing
SETUP /U at the command prompt.
If Setup referred you to this section and you have neither OS/2
nor a SpeedStor partition on your computer, see the section "Setup
displays the Incompatible Hard Disk or Device Driver screen" in
the "Diagnosing and Solving Problems" chapter of the MS-DOS
User's Guide.
If you do have a SpeedStor partition on your computer, Setup
probably referred you to this section for one of the following
reasons:
• Setup could notfind in your CONFIG.SYS file a command
for the device driver that supports your SpeedStor partition.
If this is the case, add the command line to your CONFIG.SYS
file, restart your computer, and run Setup. For more information
about adding the command line to your CONFIG.SYS file, see your
SpeedStor documentation.
• Your CONFIG.SYS file has a DEVICE=HARDRIVE.SYS line in it.
If this is the case, carry out the following procedure:
• Use the EXPAND command to expand and copy the SSTOR.SYS
file to your hard disk. Make sure you copy the SSTOR.SYS
file to the same path as the HARDRIVE.SYS file.
See the PACKING.LST file on Setup Disk 1 for the location
of the SSTOR.SYS file on the Setup disks and for instructions
on how to expand and copy it to your hard disk.
• Replace the DEVICE=HARDRIVE.SYS command with a DEVICE=SSTOR.SYS
command. For example, if the command that loaded the
HARDRIVE.SYS file was DEVICE=C:\SSTOR\HARDRIVE.SYS, you
would replace it with DEVICE=C:\SSTOR\SSTOR.SYS.
• Restart your computer.
• Make sure you can access your hard disk.
• Run Setup.
1.2 Incompatible Hard Disk or Device Driver
If Setup referred you to this section, and no other section in this
file is relevant to your system, you have a partition that is
incompatible with MS-DOS 6.21. You must delete the partition from your
hard disk. See "Using Fdisk to Configure Your Hard Disk" in the
chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS
USER'S GUIDE.
1.3 AT&T 6300 Computer
If you use an AT&T 6300 computer and your ROM BIOS is version 1.21,
contact your vendor for a ROM BIOS upgrade. The ROM BIOS version
number is displayed when you start your computer.
1.4 Toshiba with a Hard RAM Disk
These instructions apply to Toshiba models T1200, T1600,
T1200XE and T1000LE.
To use the hard RAM disk, carry out the following procedure
before you install MS-DOS 6.21:
• Back up your hard RAM disk.
• Using the Toshiba Setup program, delete the hard RAM
disk by allocating zero kilobytes (KB) to it. All data on
the hard RAM disk will be lost.
• Restart your computer
• Run MS-DOS Setup.
• After Setup is complete, run the Toshiba Setup program to reinstall
the hard RAM disk.
• Run FDISK, change to drive 2, and create a primary DOS
partition. Quit FDISK.
• Use the FORMAT command to format drive D.
1.5 Tandy with ROM DOS
Contact your hardware manufacturer for information about
upgrading a Tandy computer with ROM DOS to MS-DOS 6.21. This
applies to the following models: 1000EX, 1000HX, 1000SL, 1000SL2,
1000TL, 1000TL2, 1000TL3, 1000RL, 1000RLX, 1000RL-HD, 1000RLX-HD,
1100FD, 2500XL, 2500XL2.
1.6 Setup displays the "Your computer uses a disk-compression
program that is incompatible with Setup" message.
If Setup indicated that your computer has an incompatible
disk-compression program, you must remove it manually before you can
install MS-DOS 6.21. Contact your disk-compression vendor for an
updated version of your software. In most cases, current versions of
disk-compression software are compatible with MS-DOS 6.21.
Alternatively, you can use the procedure below to remove your
current disk-compression software.
• Back up all the files on your compressed drive. In step 3,
you will format your uncompressed drive, which destroys all the files
on your compressed and uncompressed drives.
• If your Setup disks are compatible with drive A, insert
Setup Disk 1 in drive A, and restart your computer. After Setup
displays the first screen, quit Setup by pressing F3 twice.
If your Setup disks are not compatible with drive A,
create a startup floppy disk for drive A. To do this, insert
Setup Disk 1 in drive B, and a blank floppy disk in drive A. Then
type B:SETUP /Fat the command prompt.
When prompted, choose to install MS-DOS on the floppy disk
in drive A. After Setup is finished, leave the disk in drive A,
and restart your computer.
• At the command prompt, type FORMAT C: /S to reformat your startup
drive and transfer MS-DOS 6.21 system files to it.
• Remove the disk from drive A, and restart your computer.
• Insert Setup Disk 1 in drive A or B, and type A:SETUP or
B:SETUP at the command prompt.
• After Setup is complete, restore the files you backed up. Do
not restore older versions of MS-DOS files.
1.7 You deleted files from the directory that Setup needs
to install the optional Windows programs.
If you typed BUSETUP /E at the command prompt, the "Setup did
not find the files it needs in the directory specified" message
appeared, and you think you deleted the files from
your hard disk, insert Setup Disk 1 in drive A or B, and start
Setup by typing
A:SETUP /E or
B:SETUP /E at the command prompt.
1.8 Running Setup if Your Computer Uses Windows NT
If your computer has Windows NT installed, but does not have
MS-DOS installed on it, carry out Procedure 1. If your computer
has Windows NT and MS-DOS installed on it, carry out Procedure 2.
Procedure 1
• Run Setup by inserting Setup Disk 1 in drive A and restarting
your computer. Complete Setup by following the instructions
on the screen. When Setup is complete, Windows NT will be
disabled.
If Windows NT was installed on a FAT partition, complete steps
2 and 3 of this procedure to reenable Windows NT so that you can
use both the Windows NT and MS-DOS operating systems.
If Windows NT was installed on a non-FAT partition, see section 1.9.
• Insert your Windows NT Setup disk in drive A or drive B, and then
restart your computer.
• When the Windows NT Setup screen appears, choose Repair, and then
insert your Windows NT Emergency Repair Disk (which you created when
you installed Windows NT) to repair the Windows NT system files.
Procedure 2
• When you start your computer, choose MS-DOS as your operating
system.
• Run Setup by inserting Setup Disk 1 in drive A or B, and typing
A:SETUP or B:SETUP at the command prompt.
1.9 Setup detects that your computer has a non-MS-DOS
partition or non-MS-DOS files, and your computer uses
Windows NT
The procedure you use depends on whether you want to preserve
the partition and its files. Find the section below that describes
the configuration you want.
You Don't Want to Preserve the Partition or its Files
If you don't want to preserve the partition or its files, choose to
remove the partition or files if Setup prompts you to do so. If
Setup doesn't offer you that choice, remove the partition manually
after Setup is complete. For instructions on removing a non-MS-DOS
partition manually, see "Using Fdisk to Configure Your Hard Disk" in
the chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS
USER'S GUIDE.
You Don't Want to Preserve the Partition but Want to Save its Files
If you want to save the data files, but don't want to preserve the
partition, back up the files, run Setup again, and then choose to
remove the partition or files if Setup prompts you to do so. If Setup
doesn't offer you this choice, remove the partition manually after
Setup is complete. For instructions on removing the partition
manually, see "Using Fdisk to Configure Your Hard Disk" in the
chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS
USER'S GUIDE.
You Want to Preserve the Partition and Its Files
Carry out the following procedure.
NOTE If the non-MS-DOS partition takes up all the space on your hard
disk, you must reconfigure your hard disk. You can either let Setup do
it for you, as described in the preceding section, or reconfigure it
yourself manually. For instructions on reconfiguring your hard disk
manually, see your Windows NT documentation.
To install MS-DOS 6.21 and preserve your partition or files:
• Run MS-DOS Setup.
• When prompted, choose to continue Setup without removing the
partition or files.
• After Setup is complete, insert your Windows NT Setup disk
in drive A or drive B, and then restart your computer.
• When the Windows NT Setup screen appears, choose Repair, and then
insert your Windows NT Emergency Repair Disk (which you created when
you installed Windows NT) to repair the Windows NT system files.
1.10 Setup displays the "Your computer uses password protection"
screen.
See section 1.12.
1.11 Setup displays the "Your computer is using an incompatible
delete-protection program" screen.
See section 1.12.
1.12 Setup detects that your computer uses DR DOS.
If you have DR DOS installed on your computer, take the following
precautions before restarting Setup:
• If your system has any security features, including password protection,
disable them. For more information, see "Setup displays the 'Your
computer uses password protection' screen" in the chapter "Diagnosing
and Solving Problems" in the MICROSOFT MS-DOS USER'S GUIDE.
If you have protected any files or directories with a password,
remove the password protection, particularly if you have protected
your CONFIG.SYS or AUTOEXEC.BAT files, or your DR DOS directory.
• If you have DELWATCH installed on your computer, carry out
the procedure "Setup displays the 'Your computer is using an
incompatible delete-protection program' screen" in the chapter
"Diagnosing and Solving Problems" in the MICROSOFT MS-DOS
USER'S GUIDE.
• If your CONFIG.SYS or AUTOEXEC.BAT files use any conditional commands--
such as the "?" or GOTO commands--remove them and adjust the order of
commands in your startup files accordingly.
• If your CONFIG.SYS file uses the CHAIN command, remove it and
adjust the order of commands in the file accordingly.
• If your computer uses disk compression, but drive C is not compressed,
run Setup as described in the chapter "Getting Started" in the
MICROSOFT MS-DOS USER'S GUIDE. When Setup displays the "Your
CONFIG.SYS file contains commands that are not valid MS-DOS commands"
message, choose the "Modify original files" option.
If drive C is compressed, carry out the following procedure:
• Determine which drive is your original uncompressed drive. For more
information, see your DR DOS documentation.
• Make backup copies of the CONFIG.SYS and AUTOEXEC.BAT files on your
compressed drive, and the DCONFIG.SYS file on your uncompressed drive.
• Combine the two configuration files. For example, if drive D is your
uncompressed drive, type the following at the command prompt:
COPY D:\DCONFIG.SYS+C:\CONFIG.SYS D:\CONFIG.SYS
• Copy the combined CONFIG.SYS file to drive C. For example, if drive
D is your uncompressed drive, type the following at the command
prompt:
COPY D:\CONFIG.SYS C:\CONFIG.SYS
• Copy your AUTOEXEC.BAT to your uncompressed drive. For example, if
drive D is your uncompressed drive, type the following at the
command prompt:
COPY C:\AUTOEXEC.BAT D:\AUTOEXEC.BAT
• Run MS-DOS 6.21 Setup.
• When Setup displays the "Your CONFIG.SYS file contains commands
that are not valid MS-DOS commands" message, choose the "Modify
original files" option.
When Setup displays the "Because you are currently using the
DR DOS operating system" message, choose Continue.
• After Setup is complete, MS-DOS displays an "Unrecognized command"
message on your screen for each command in your AUTOEXEC.BAT and
CONFIG.SYS files that is not a valid MS-DOS command. Remove these
commands from your CONFIG.SYS and AUTOEXEC.BAT files.
• Add the DEVICE=HIMEM.SYS command to the beginning of your
CONFIG.SYS file, and the restart your computer.
1.13 Installing MS-DOS on a Drive Other Than C
As described in the following procedure, you can install MS-DOS
on a drive other than C by using the /M switch to copy the system
files to your startup drive and then using the /Q switch to copy your
MS-DOS files to a different drive.
NOTE This procedure is designed for advanced users. If your computer
uses disk-compression software, modify the procedure as appropriate.
NOTE If your computer uses disk-partitioning software, such as Disk
Manager, SpeedStor, Priam, or Everex, do not carry out the procedure until
you have carried out steps 1 through 3 of "You need to install MS-DOS
manually" in the chapter "Diagnosing and Solving Problems" in the
MICROSOFT MS-DOS USER'S GUIDE. If your software uses a driver to
enable the drive on which you want to install MS-DOS, make sure you create
a startup disk with the driver in a CONFIG.SYS or AUTOEXEC.BAT file.
After you have carried out these steps, skip to step 3 of the following
procedure.
• Run Setup by inserting Setup Disk 1 in drive A or B, and
typing A:SETUP /M or B:SETUP /M at the command prompt.
NOTE Your CONFIG.SYS and AUTOEXEC.BAT files were saved as CONFIG.NEW
and AUTOEXEC.NEW.
• Run Setup by inserting Setup Disk 1 in drive A or B, and typing
A:SETUP /Q or B:SETUP /Q at the command prompt. Follow the
instructions on your screen.
• When Setup displays the system settings screen, choose the MS-DOS
Path option. Type the drive and directory where you want
to install MS-DOS, and press ENTER. Continue Setup.
• After Setup is complete, open your CONFIG.NEW and AUTOEXEC.NEW files
and ensure that their commands specify the correct path. Save the files
as CONFIG.SYS and AUTOEXEC.BAT. Then restart your computer.
1.14 Bypassing the Uninstall Disk and Using Default Setup Options
To keep Setup from creating an Uninstall Disk, use the /G switch
with the Setup command.
To bypass the Uninstall disk and use default Setup options
instead of choosing them yourself, use both the /H and /G switches
with the Setup command.
WARNING The primary purpose of the Uninstall disk is to safeguard
your files during and after Setup. If Setup doesn't create
an Uninstall disk, you will not be able to restore your previous
version of DOS. If Setup should render your hard disk inaccessible,
you will not be able to use the Uninstall disk to make it accessible
again.
NOTE If you have a version of MS-DOS earlier than 5.0, and you use
the /G switch or the /H and /G switches together, Setup will not
prompt you if you need to update your network files.
1.15 Installing MS-DOS 6.21 on a System with a CorelSCSI UNI_ASP.SYS Driver
If your system uses the CorelSCSI UNI_ASP.SYS device driver for optical
drives, and Setup stops running when you try to install MS-DOS 6,
delete the DEVICE command in your CONFIG.SYS that loads the Corel
UNI_ASP.SYS driver. Then run Setup again. After Setup is complete,
reinstall the Corel UNI_ASP.SYS driver as you originally installed it.
If you continue to have problems, contact Corel Customer Service.
1.16 Installing MS-DOS 6.21 if you have DrivePro or EZ-Drive
If your hard disk was set up using Micro House DrivePro(TM) or
EZ-Drive(TM), you must carry out one of the following procedures
before you can install MS-DOS 6.21.
• If your DrivePro or EZ-Drive floppy disks include the DOS6INST.EXE
file, run the DOS6INST program and follow the instructions on the
screen. (This program is also available on the Micro House BBS at
(303) 443-9957.)
• If you don't have the DOS6INST program, run the MHDRIVE program (if
you have DrivePro) or the EZ-RESET program (if you have EZ-Drive).
Press ENTER to accept the default answers until the program prompts
you to insert MS-DOS Setup Disk 1. Insert the disk and then press
ENTER. At the second Setup screen, choose "Continue Setup and
replace your current version of DOS." (Note that this procedure
will replace your current CONFIG.SYS and AUTOEXEC.BAT files with
basic versions of these files.)
For additional information, or if you encounter problems, contact
Micro House Technical Support.
1.17 Setup displays the "There is not enough free disk space" screen
and you are running PC-DOS version 6.1 with compression
If your computer is running PC-DOS version 6.1 with PC-DOS disk
compression, when you run MS-DOS Setup, it displays the message
"There is not enough free disk space on drive C to install MS-DOS."
PC-DOS disk compression is incompatible with MS-DOS. Before you
install MS-DOS 6.21, you must first uninstall your PC-DOS disk
compression from all your compressed drives and then completely
remove PC-DOS disk compression. For more information, see "Upgrading
from PC-DOS 6.1" later in this file.
Note: If you have completely uninstalled PC-DOS compression and this
message still occurs, you also need to free some space on drive C.
1.18 Setup cannot update a file
If Setup cannot update one of your MS-DOS files, it displays a message
with the title "Cannot Update File." If you continued Setup, your MS-DOS
6.21 installation is incomplete because the specified file was not updated
toversion 6.21. If the file is one you know you don't need (for example,
if it's a DoubleSpace file and you don't use DoubleSpace), don't worry
about it. (If you are running PC-DOS 6.1, see section 1.20 of this file).
If you are not sure, update the file using the following procedure (you
will need your MS-DOS 6.0 distribution disks):
• If you use DoubleSpace and the file that was not updated was a
DoubleSpace file, or if your system does not work properly after
you receive this error message, insert your Uninstall disk in
drive A and type A:\UNINSTAL at the command prompt.
• Insert MS-DOS 6.0 Setup Disk 1 (not MS-DOS 6.21 Setup Disk 1) in
drive A or drive B, and then use MS-DOS Editor (EDIT) to view
the contents of the PACKING.LST file. This file tells you where each
file is located on your MS-DOS 6.0 disks. Determine which MS-DOS 6.0
disk contains the file you need.
• Insert the appropriate MS-DOS 6 disk in drive A or drive B, and then
use the EXPAND command to expand the file. For example, to expand the
file DBLSPACE.BI_ from the disk in drive A to the directory C:\DOS,
you would type the following command:
EXPAND A:\DBLSPACE.BI_ C:\DOS\DBLSPACE.BIN
For more information, see the comments at the beginning of the
PACKING.LST file, or see the MS-DOS 6 User's Guide.
• Run MS-DOS 6.21 Setup again. This time, Setup should be able to update
the file.
1.19 Upgrading from PC-DOS 6.1
If your computer is running PC-DOS version 6.1 with PC-DOS disk
compression, you cannot install MS-DOS 6.21 until you remove the
disk compression. This is because PC-DOS disk compression is
incompatible with MS-DOS. Follow these steps:
• First, uninstall your PC-DOS disk compression from all your
compressed drives. (For information on uncompressing PC-DOS
compressed drives, see the information on the SSUNCOMP command
in the PC-DOS documentation.)
• When SSUNCOMP uncompresses your last compressed drive, it asks
if you want to disable the driver. Answer Yes to remove the
PC-DOS version of the DBLSPACE.BIN file.
• Change to the directory that contains your PC-DOS files, and
then type the following command:
• Insert MS-DOS 6.21 Setup Disk 1 in drive A or drive B, and then
type A:SETUP or B:SETUP.