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			 OS2DRV.DOC
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This file describes the features and use of the NCR SDMS device 
drivers for the OS/2 operating system environment. It is divided 
into the following sections:

Introduction
OS2CAM.ADD
   Features
   Description
   Installation
   Command Line Options
   Troubleshooting
Important Additional Information
   Sytos Plus Tape Drive Support
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************************** Introduction ***************************

The OS/2 Version 2.X operating system provides an integrated platform 
featuring a graphical windowing interface, called Presentation Manager, that 
allows multiple applications to be viewed at the same time. Multitasking is 
also supported, enabling several different programs to run at the same time 
in different windows. Presentation Manager allows the user to switch between 
programs, start other programs, and maintain files and directories. OS/2 
Version 2.X requires an 80386 or higher microprocessor and will not run on a 
PC-XT, 286 AT, or clones of those models. Other hardware requirements include 
a minimum of 4 megabytes of RAM (8 megabytes or more is recommended) and a 
minimum hard disk drive size of 60 megabytes. NCR provides the necessary SCSI 
device driver for OS/2 2.X. We recommend reviewing the OS/2 2.X manual prior 
to proceeding.



************************** OS2CAM.ADD *****************************


* Features *

 Enhanced host bus adapter performance
 Supports use of SCSI disk drives, tape drives, and CD-ROMS
 Synchronous negotiation (including fast SCSI)
 Supports multiple host adapters
 Multiple logical unit number (LUN) support
 Disconnect/Reselect
 Supports scatter-gather
 Tagged command queuing


* Description * 

Although the NCR SCSI controllers firmware can access the SCSI hard disk 
drives attached to the computer independently, the SCSI device driver 
OS2CAM.ADD acts as an enhanced interface between the computer system and the 
SCSI BIOS firmware. Use of the device driver increases the abilities of the 
SCSI controller firmware and fully utilizes the advancements and improvements 
of 80386 and higher microprocessors. 

The device driver is also necessary to support the use of SCSI tape drives 
and CD-ROM drives with an OS/2 system. The NCR OS2CAM.ADD device driver also 
supports other manufacturers SCSI software written in compliance with the 
IBM OS/2 ADD (Adapter Device Driver) specification.


* Installation *

Installing OS2CAM.ADD (with OS/2 already installed)

The NCR device driver floppy diskette contains two files, the device driver 
OS2CAM.ADD and a text file, OS2CAM.DDP. When the device driver installation 
utility under OS/2 is activated, it looks for a file with the DDP extension. 
The DDP file contains the necessary information to install the SCSI device 
driver.

1. At the OS/2 Desktop, double-click on System Setup. 

2. Double-click on Device Driver Install.

3. Insert the floppy disk containing the NCR device driver in the source 
drive, then click on the change button for the destination directory.

4. Choose OS2 and click on the set button.

5. Click the install button.

6. Choose the NCR OS/2 2.X driver from the list provided by clicking on it 
once. The choice will be highlighted. Then click the OK button, then the EXIT 
button.

7. To make sure that the installation was successful, open the productivity 
folder on the OS/2 Desktop, then double-click the OS/2 System Editor to start 
the editor. Open the CONFIG.SYS file and find the line:

	BASEDEV=OS2CAM.ADD /V

Then check that the file OS2CAM.ADD is in the OS2 directory on drive C:.


Installing OS2CAM.ADD and OS/2 (from a floppy) to a SCSI Hard Drive

In this case, since OS/2 will be installed from a floppy disk, it is not 
required that the driver be present to install the operating system (as is 
the case when installing from a CD-ROM).

1. Proceed with the OS/2 installation program until it allows for Device 
Driver Install.

2. Insert the floppy disk containing the NCR device driver in the source 
drive, then click on the change button for the destination directory.

3. Choose OS2 and click on the set button.

4. Click the install button.

5. Choose the NCR OS/2 2.X driver from the list provided by clicking on it 
once. The choice will be highlighted. Then click the OK button, then the EXIT 
button.

6. To make sure that the installation was successful, open the productivity 
folder on the OS/2 Desktop, then double-click the OS/2 System Editor to start 
the editor. Open the CONFIG.SYS file and find the line:

	BASEDEV=OS2CAM.ADD /V

Then check that the file OS2CAM.ADD is in the OS2 directory on drive C:.

7. Continue with the OS/2 installation process as documented in the OS/2 
Installation Guide.


Installing OS2CAM.ADD and OS/2 (from a CD-ROM) to a SCSI Hard Drive

To install OS/2 from a SCSI CD-ROM attached to an NCR host adapter, the SCSI 
driver must be present in order to access the CD-ROM. The following steps 
allow installation of OS/2 from a SCSI CD-ROM.

1. Make copies of the two floppy disks used for installation that are 
included with the CD-ROM version of OS/2. These disks are labeled 
Installation Diskette and Diskette 1.

2. Copy the files OS2CAM.ADD and OS2CAM.DDP from the NCR distribution disks 
to the copy of Diskette 1.

3. Edit the file CONFIG.SYS on the copy of Diskette 1 by adding the 
following line:

	BASEDEV=OS2CAM.ADD

4. Place the copy of Installation Diskette in the A: drive and reboot the 
computer.

5. Proceed with the OS/2 installation process as documented in the OS/2 
Installation Guide.

Driver Order in the CONFIG.SYS File

Because of the way OS/2 assigns drive letters, the order in which drivers 
appear in the CONFIG.SYS file is important. The drivers must appear in the 
order in which the drive letters are to be assigned. Refer to the OS/2 
documentation to fully understand this requirement.


* Command Line Options *

The OS2CAM.ADD driver has several embedded functions which can be accessed 
via switches on the command line. These options are described below.

Using the /V Option

This option appears on the command line by default. It enables display of a 
banner, version number, and SCSI bus information during start up of the 
system. The command line in CONFIG.SYS should look like this:

      BASEDEV=OS2CAM.ADD /V

To disable this feature, remove this switch from the command line.

Using the /!SN Option

This option means "no synchronous". Synchronous transfers are typically 
faster than asynchronous, so this option should only be used if synchronous
transfers cause a problem with your system. To disable synchronous 
operations, the command line in CONFIG.SYS should look like this:

      BASEDEV=OS2CAM.ADD /!SN

Using the /!Q Option

This option means "no queue tag support". Queue tagging is used by high end 
systems to allow more than one outstanding command per SCSI device. To 
disable queue tag support, the command line in CONFIG.SYS should look like 
this:

     BASEDEV=OS2CAM.ADD /!Q

Using the /ET Option

This option is used to enable Embedded Targets (LUNs). LUNs are used by high 
end systems, such as disk arrays, to address certain portions of a SCSI ID.
Most standard SCSI devices do not use LUNs, and default to LUN 0. This option 
should be used only for devices that use LUNs other than 0. To enable LUN 
support, the command line in CONFIG.SYS should look like this:

     BASEDEV=OS2CAM.ADD /ET

Using the /DM Option

This option enables use of the IBM supplied DASD manager (OS2DASD.DMD) for
the devices listed. The DASD manager is used to support direct access devices
such as hard drives, and should be enabled unless an alternative is being 
used. The DASD manager is enabled by default. The DASD manager is enabled by
default. To enable DASD manager support for specified devices, the command in
CONFIG.SYS should look like this:

     BASEDEV=OS2CAM.ADD /DM: d|(d,d),[d|(d,d)]

Where:

     d,d,...d represents a SCSI target ID. It is assumed that the LUN for the 
     specified ID is 0.

     (d,d),(d,d),...(d,d) represents a SCSI target/LUN ID pair.

     "|" means "or".

Using the /!DM Option

This option disables use of the IBM supplied DASD manager (OS2DASD.DMD) for
the devices listed. The DASD manager is used to support direct access devices
such as hard drives, and should be disabled only if an alternative is being 
used. The DASD manager is enabled by default. The DASD manager is enabled by
default. To disable DASD manager support for specified devices, the command 
in CONFIG.SYS should look like this:

     BASEDEV=OS2CAM.ADD /!DM: d|(d,d),[d|(d,d)]

Where:

     d,d,...d represents a SCSI target ID. It is assumed that the LUN for the 
     specified ID is 0.

     (d,d),(d,d),...(d,d) represents a SCSI target/LUN ID pair.

     "|" means "or".

Using the /SM Option

This option enables use of the IBM supplied SCSI manager (OS2SCSI.DMD) for
the devices listed. The SCSI manager is used by some devices to provide a 
SCSI interface for some applications. The SCSI manager is disabled by
default. To enable SCSI manager support for specified devices, the command in
CONFIG.SYS should look like this:

     BASEDEV=OS2CAM.ADD /SM: d|(d,d),[d|(d,d)]

Where:

     d,d,...d represents a SCSI target ID. It is assumed that the LUN for the 
     specified ID is 0.

     (d,d),(d,d),...(d,d) represents a SCSI target/LUN ID pair.

     "|" means "or".

Using the /!SM Option

This option disables use of the IBM supplied SCSI manager (OS2SCSI.DMD) for
the devices listed. The SCSI manager is used by some devices to provide a
SCSI interface for some applications. The SCSI manager is disabled by default.
To disable SCSI manager support for specified devices, the command in
CONFIG.SYS should look like this:

     BASEDEV=OS2CAM.ADD /DM: d|(d,d),[d|(d,d)]

Where:

     d,d,...d represents a SCSI target ID. It is assumed that the LUN for the 
     specified ID is 0.

     (d,d),(d,d),...(d,d) represents a SCSI target/LUN ID pair.

     "|" means "or".



* Troubleshooting *

YOU CANNOT ACCESS THE HARD DRIVE(S).

a. Make sure the SCSI device driver is installed properly.

b. Make sure each hard drive has power.

c. Check the cable connections and the host bus adapter installation.

THE COMPUTER HANGS OR LOCKS UP WHEN BOOTING AND THE HARD DISK DRIVES ATTACHED 
ARE NOT SEEN BY THE COMPUTER SYSTEM.

a. Make sure that all the hard disk drives are configured at different ID 
numbers (boot drive should have lowest ID).

b. Make sure both ends of the SCSI bus are terminated.

c. Make sure the device driver is listed in CONFIG.SYS (and loaded when 
booting)

THE DEVICE DRIVER DOES NOT SEE ONE OF THE HARD DISK DRIVES.

a. Reboot the computer.

b. Make sure the hard drives have different ID numbers (boot drive should 
have lowest ID).

c. Make sure both ends of the SCSI bus are terminated.

d. Check the cable and power connections.

OS/2 INSTALLS TO AN IDE DRIVE IN THE SYSTEM INSTEAD OF TO THE SCSI DRIVE.

a. The IDE drive must be physically disconnected before attempting to install 
to a SCSI drive.



***************** Important Additional Information ****************


* Sytos Plus Tape Drive Support * 

High-speed tape backup has become essential to computer systems as the 
capacities of hard disk drives have increased. The NCR OS2CAM.ADD driver 
provides support for the Sytos Plus Version 1.35 (or above) Tape Backup 
System. This device driver will function properly with the Sytos Plus 
software.

1. Determine where in the SCSI chain to place the tape drive. If the tape 
drive is installed in a system with other SCSI devices, and is the last 
device on the SCSI chain, it must be terminated. If it is not the last 
device in the SCSI chain, do not terminate the tape drive. 

2. Set the ID number of the tape drive. Consult the tape drives manual on 
how to set the ID number. Remember, the ID number cannot be the same as any 
other SCSI device installed.

3. If not done previously, install the OS2CAM.ADD device driver. See the 
section above entitled Installation.

4. Reboot your computer.

5. Follow the instructions in the Sytos manual for installation of the Sytos 
Plus software. The Sytos Plus installation will place the Sytos Plus drivers 
on your hard disk drive.

 


