I have a PS/2 install disk that has this readme:
Sysgen Bridge-File
Sept 1, 1988
CONTENTS OF FLOPPY:
This floppy should contain following six files:
INSTALL.EXE
BRIDGE.DRV
BRIDGE_B.DRV
VIEW.COM
FORMAT35.COM
README
INSTALL program installs the driver in your CONFIG.SYS file to be
executed at boot time.
BRIDGE.DRV is the driver to handle your internal and/or external floppy
drives when:
A) You are installing two or more drives.
B) You are installing one drive and it is installed
as a drive other than drive B:
This program is copied to your root directory of your boot drive
by the INSTALL program.
BRIDGE_B.DRV is the driver to handle your internal or external floppy
drive when:
A) You are installing a single drive as drive B:
(internal such as on an AT or compatible or
external such as on a PS/2)
This program is copied to your root directory of your boot drive
by the INSTALL program.
VIEW program lists the drive letter(s) of internal and/or external drives
currently active in your system.
FORMAT35 program is for users with DOS 3.1 or earlier which provides
no format support for 3-1/2" drives and for users with DOS 2.1 for
1.2MB drives. If you are one of such users, use FORMAT35 to format
any 3-1/2" diskettes or 1.2Mb diskettes.
README is this file which you are currently viewing.
DEVICE DRIVER PARAMETERS:
The parameters which follow the DEVICE=BRIDGE.DRV or DEVICE=BRIDGE_B.DRV
used in the CONFIG.SYS file to install the Bridge-File driver are as
follows:
DEVICE=BRIDGE.DRV /??????? or DEVICE=BRIDGE_B.DRV /???????
where the parameters are as follows:
/PS80:d?? - PS/2 20MHz model 80
/PS70:d?? - PS/2 model 70 or model 50Z
/PS60:d?? - PS/2 model 60 or 16MHz model 80
/PS50:d?? - PS/2 model 50
/PS30:d?? - PS/2 model 30
/PCAT:d?? - PCAT or compatible
/PCXT:d?? - PCXT or PC or compatible
The d: refers to the type of drive. Valid values for d are:
d=1 - 1.2Mb 5.25" drive
d=2 - 720Kb 3.5" drive
d=3 - 1.44Mb 3.5" drive
d=4 - 360Kb 5.25" drive
The two question marks ( ? ) following the 'd' parameter are usually
omitted and are used to indicate special installation. The following
can be substituted for the ??.
'I' - can only be used in a /PCAT:d configuration
and indicates that the drive being
installed is an internal drive on an IBM AT
or compatible.
'IB' - can only be used in a /PCAT:d configuration
and indicates that the drive being
installed is an internal drive on an IBM AT
or compatible and will be referenced as "B"
drive (Installed as B).
'B' - can be used in a /PS80:d, /PS70:d, /PS60:d,
and PS50:d configuration and indicates that
the drive being installed is to be
referenced as "B" drive. (Installed as B).
'E' - can be used in a /PS80:d, /PS70:d, /PS60:d,
and PS50:d configuration and indicates that
the system already has two internal drives
and that the drive being installed will be
an external drive.
EXAMPLES:
DEVICE=BRIDGE.DRV /PCAT:3IB /PCAT:3
- indicates that an internal 1.44Mb 3.5" drive will be installed
on an IBM AT or compatible as drive "B" and that an external
1.44Mb 3.5" drive will also be installed at the next free drive
location. ie D: or E: or F: or etc.
DEVICE=BRIDGE.DRV /PS80:1B /PS80:1
- indicates that an internal 1.2Mb 5.25" drive will be installed
in a 20MHz PS/2 model 80 as drive "B" and that an external 1.2Mb
drive will also be installed at the next free drive location. ie
D: or E: or F:, etc.
DEVICE=BRIDGE.DRV /PS70:1E
- indicates that a PS/2 model 70 or model 50z already has 2
internal drives and that a 1.2Mb 5.25" drive will be installed at
the next free drive location. ie D: or E: or F:, etc.
DEVICE=BRIDGE.DRV /PCXT:2 /PCXT:2
- indicates that two 720Kb 3.5" drive will be installed in an IBM
XT or compatible as external drives at the next two free drive
locations. ie D: and E:, or E: and F:, or F: and G:, etc.
DEVICE=BRIDGE_B.DRV /PS80:1B
- indicates that one 1.2Mb 5.25" drive will be installed in a
20 MHz PS/2 model 80 as drive "B".
