Document 1616
OS/2 Installation with DR DOS
06/05/92

                        Novell Desktop Systems Group

NOTES

This document will supplement the information found in the OS/2
Installation Guide. A full understanding of the 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 planing 
accordingly. If only OS/2 & DR DOS 6.0 are going to be installed, see the
"Dual Boot" section. If an additional Single User Disk Operating System is
going to be used see the "Multiple DOS" section in addition to the "Dual
Boot" section. If you are planning to use OS/2 with another OS version
see the "Multi Boot" Section.

DUAL BOOT

For DR DOS in use with OS/2, the dual boot is the most practical method for 
the end user. As explained in the Installation Guide on page 25, DR DOS
must be installed on the drive prior to installing OS/2. Make sure there
is at least 40MB of hard disk partition as the primary drive. OS/2 can
take up as much as 34MB of disk space and DRDOS needs 2.5MB of space. Do
not compress the primary drive with SuperSTOR or other disk compression
utilities. Copy COMMAND.COM to the DRDOS 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

If more than one DOS is to be used with OS/2, batch files for rebooting
are necessary to determine which system to utilize on reboot.  MS DOS and
DR DOS can not be used with OS/2 without a third party boot manager.
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

To use OS/2 with another OS as well as DR DOS use the Multi boot method
described in the Installation Guide. Do not load DR DOS prior to OS/2
installation. 

DO FDISK the drive with DR DOS with partitions described in the
Installation Guide (Figure 3 page 36). Install OS/2, then install DR DOS.
If you use the FDISK utility with OS/2, you will need to format the drive
with DR DOS before installing. After installation make the same changes
with regard to COMMAND.COM and CONFIG.SYS as described in the "Dual Boot"
section.

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