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OS2DOS
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OS2DOS.DOC
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1993-05-17
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OS2DOS version 1.0c 5/11/93
---[ Overview ]------------------------------------------------------[1.0]--
OS2DOS is a utility to allow you to switch between DOS and OS/2.
It is designed to work during the boot process like BOOTCON,
however it is independent from BOOTCON. When both OS2DOS and
BOOTCON are installed, first, OS2DOS will prompt you to choose
either DOS or OS/2, then, if you choose DOS, BOOTCON will appear
as usual.
OS2DOS is easier to use than OS/2's BOOT.COM, but avoids the
complexity of the Boot Manager facility in OS/2 2.0.
OS2DOS has been tested with OS/2 1.3 and 2.0. It requires an
identical structure to OS/2's BOOT.COM. Before installing
OS2DOS you must have BOOT.COM installed and functioning properly
on the system. If you are not currently using BOOT.COM, install
it first according to your OS/2 documentation. (You must have
OS/2 and DOS installed on a single FAT partition in order to use
BOOT.COM or OS2DOS.)
---[ Installation ]--------------------------------------------------[2.0]--
To install OS2DOS, first ensure that BOOT.COM is functioning
properly, and that using it you can successfully switch between
DOS and OS/2.
OS2DOS will currently only work if C: is first hard disk on the
system and it is the boot drive.
Copy the files OS2DOS.SYS, OS2DOS.PAR, and OS2DOS.EXE into the
root directory of the C: drive.
Run the program OS2DOS specifying the drive letter as follows:
OS2DOS C:
If the installation is successful, you will be informed that
the partition table was successfully updated, and the file
OS2DOS.BAK will be created. This file is a copy of the original
partition table and should be kept in a safe place in case you
decide to uninstall OS2DOS.
Once OS2DOS is installed, the files OS2DOS.EXE, OS2DOS.PAR, and
OS2DOS.BAK may be moved out of the root directory, however the
file OS2DOS.SYS must remain. If this file is accidently moved
or deleted, OS2DOS will use whichever OS happens to be installed
until the file is replaced into the root directory.
---[ Using OS2DOS ]--------------------------------------------------[3.0]--
Once OS2DOS is installed, each time the system is booted, you
will be presented with a question as to what operating system
to use. The current OS will be automatically selected in 10
seconds if no choice is made. Press the "D" key for DOS, the
"O" key for OS/2, or use the cursor keys to highlight the option
you want to use and press [Enter].
You can disable OS2DOS from coming up during a boot by pressing
and holding the SHIFT key before OS2DOS comes up.
If OS2DOS detects that the boot record has been changed and no
longer matches the copy stored in the C:\OS2\SYSTEM directory,
a message will be displayed stating so. Once the user presses
a key, the original boot record (BOOT.DOS or BOOT.OS2) will be
backed up to the file BOOT.SAV and the new boot record will be
written out in its place.
---[ Directory Structure ]-------------------------------------------[4.0]--
OS2DOS uses a structure identical to OS/2's BOOT.COM. In fact,
they can be used together without problem.
The original boot records for DOS and OS/2 are stored in the
C:\OS2\SYSTEM directory in the files BOOT.DOS and BOOT.OS2.
These files are marked Hidden and Read-Only.
The CONFIG and AUTOEXEC files for the OS that is NOT currently
in use are stored in the same directory with the filename
extensions "DOS" or "OS2" according to what OS they are for.
Each time OS2DOS or BOOT.COM is run, the current CONFIG and
AUTOEXEC files are moved to this directory, the new ones are
moved to the root directory, and the appropriate boot record
is written out.
The difference between OS2DOS and BOOT.COM is that OS2DOS does
this during the boot, whereas BOOT.COM requires the computer to
be completely booted up into one OS or the other before the
change can be made.
---[ How it Works ]--------------------------------------------------[5.0]--
OS2DOS replaces the code in the partition table with code to
load itself. Each time the system is booted, OS2DOS loads and
lets the user choose which OS to run. Once the choice is made,
the appropriate files are re-arranged as needed.
OS2DOS does not conflict with, and can work in combination with
OS/2's Boot Manager and the Windows NT OS loader. To use Boot
Manager with OS2DOS, hold down the shift key during the boot to
bypass OS2DOS, then Boot Manager will load as usual.
OS2DOS cannot work with other programs that require special
partition table code.
---[ Uninstalling OS2DOS ]-------------------------------------------[6.0]--
If you have difficulty using OS2DOS, it can be easily unin-
stalled.
Uninstall OS2DOS by using the OS2DOS.EXE program with the
/UNINSTALL command line option as follows:
OS2DOS /uninstall C:
The backup copy of the partition table OS2DOS.BAK will be
restored. After an uninstall, the file OS2DOS.SAV will be
created in the root directory.
---[ End of OS2DOS.DOC ]----------------------------------------------------