
                                    FYI

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          TITLE: OS/2 INSTALLATION WITH DR DOS
   DOCUMENT ID#: FYI-M-1616
           DATE: 06NOV92
        PRODUCT: OS/2 & DR DOS 
PRODUCT VERSION:        6.0 
     SUPERSEDES: 05JUN92

GENERAL NOTES

This document will supplement the information found in the OS/2
Installation Guide. A full understanding of the OS/2 Installation
Guide is necessary to properly install OS/2 with DR DOS 6.0.


PLANNING AHEAD

Determine which operating systems are to be used on the system and
plan accordingly. If only OS/2 & DR DOS 6.0 are being installed,
refer to the DUAL BOOT section below. If an additional single user
disk operating system is going to be used refer to both the DUAL
BOOT and MULTIPLE DOS sections. If you are planning to use OS/2, DR
DOS and a third OS version refer to the MULTI BOOT section.

DUAL BOOT  (OS/2 & DR DOS)

Dual Boot is the most practical method of installation for the
customer with OS/2 and DR DOS. Prior to installation take care to
observe the noted precautions.  Make sure that there is at least
40MB available as the primary partition. OS/2 can take as much as
34MB of disk space and DR DOS requires 2.5MB of space. Do not
compress the primary drive with SuperSTOR or other disk compression
utilities. As explained in the OS/2 Installation Guide on page 25:

-DR DOS must be installed on the drive prior to installing OS/2. 
-Copy COMMAND.COM to the DR DOS directory and edit the CONFIG.SYS 
 file to read:

       SHELL=C:\DRDOS\COMMAND.COM C:\DRDOS
       (COMSPEC=C:\OSUTILS\COMMAND.COM for Multiuser DOS)

OS/2 is now ready to install.


MULTIPLE DOS (OS/2, DR DOS & ?DOS)

If more than one DOS is to be used with OS/2, batch files are used
to determine which OS to boot.  A third party boot manager is
required to use DR DOS and MS DOS with OS/2. A sample batch file to
alternate between DR DOS 5.0 and DR DOS 6.0 follows:

DOSBOOT.BAT

ATTRIB IBM*.COM -RSH
If "%ver%"=="6.0" GOTO DRDOS6
:DRDOS5
REN IBM*.COM DR5*.COM
REN DR6*.COM IBM*.COM
GOTO END
:DRDOS6
REN IBM*.COM DR6*.COM
REN DR5*.COM DR6*.COM
:END
ATTRIB IBM*.COM +RSH
ECHO   REBOOT THE SYSTEM NOW . . . 

This file will remove the attributes of the IBMBIO.COM and
IBMDOS.COM in order to rename them. Check for current version and
prepare to change to alternate version. Rename the current system
files to appropriate version files. Rename the future version files
to the appropriate system files. Restore the attributes of the new
system files.

The system must be rebooted for these changes to take effect. 

NOTE: 
     If Dual Booting from OS/2 - the system will return to the
     version of DR DOS for the current system files.


MULTI BOOT (OS/2, DR DOS & A THIRD OS)

Using the Multi Boot method described in the OS/2 Installation
Guide follow the steps listed: 

-Prepare the drive with OS/2 FDISK (DO NOT FDISK with DR DOS)
-Install OS/2
-Format the DOS partition with the DR DOS FORMAT command
-Install DR DOS
-Copy COMMAND.COM to the DR DOS directory & edit the CONFIG.SYS to 
 read:

       SHELL=C:\DRDOS\COMMAND.COM C:\DRDOS
       (COMSPEC=C:\OSUTILS\COMMAND.COM for Multiuser DOS)


-Install the third operating system.

This method does not work with two versions of DOS.

For more information see Document 1617 on OS/2 and DR DOS
Compatibility.
