
             Adaptec 7800 Family Manager for OS/2 2.1X/Warp
             =============================================

      (Supports AHA-2940/2940W, AHA-3940/3940W, and AIC-7850/7870)

          ================================================
           INSTALLATION INSTRUCTIONS FOR THE OS/2 DRIVER:
          ================================================

1) Installing a New Driver or Updating an Existing Driver for OS/2 2.1X/Warp
----------------------------------------------------------------------------
a) Open the OS/2 System Folder, then open the System Setup folder.

b) Double-click on Device Driver Install.

c) Insert the Manager Set floppy in the appropriate drive.

d) Change to the directory where the driver is located, usually OS2.
								      
e) When you find the driver (AIC7870.ADD), select INSTALL.

6) After the install finishes, a message will appear to report the 
   status.  An error will be displayed if no host adapters are found.

   You may also install the driver manually.  Copy AIC7870.ADD to C:\OS2.
   Add a line to your CONFIG.SYS that says BASEDEV=AIC7870.ADD .

2) First-Time Installation of OS/2 2.1X/Warp From Floppy Diskette
-----------------------------------------------------------------
a) Make backup copies of the Installation Diskette and Disk #1.

b) Using the backup copies of the Installation Diskette and Disk #1 
   do the following:
   1) Copy OS2LDR from the 7800 Manager Set onto the Installation Diskette.
   2) Copy IBMINT13.I13 from the 7800 Manager Set onto Disk #1.

c) Install OS/2 using the backup diskettes and the remainder 
   of the standard OS/2 diskettes.
	 
d) When installation has completed, reboot the system.

e) After the system has rebooted, follow the instructions for installing
   the driver on a system containing OS/2.

3) First-Time Installation of OS/2 2.1X From CD-ROM
---------------------------------------------------
a) Make a backup copy of Disk #1.

b) Copy the file AIC7870.ADD to the backup copy of Disk #1.

c) Using a text editor, add the following line to the CONFIG.SYS found
   on Disk #1 :

        BASEDEV=AIC7870.ADD

d) When installation has completed, reboot the system.

4) First-Time Installation of OS/2 Warp From CD-ROM
---------------------------------------------------
Follow the steps a-d above.  After reboot, update the AIC7870.ADD on the
boot drive from DISK #1 (this file will be overwritten from the CD-ROM).

Additional Notes:
-----------------

OS/2 2.1X currently does not identify PCI systems and handles them
in the same way it would an ISA system. This can cause several different
problems: trouble installing OS/2 2.1X and an inability to share a single
interrupt between multiple PCI adapters.

IBM is aware of these problems and has open APARs (PJ14230 and PJ14710)
tracking them. They will be fixed in a future release of OS/2; please check
the list of closed APARs accompanying each future release.

Currently, we have files which can be used as interim fixes for both these
problems:

   OS2LDR - A new PCI aware version of the loader. This file can be used
   during installation or installed after the installation of OS/2 has
   completed.

   IBMINT13.I13 - A new PCI aware version of the generic INT 13H driver that
   is used during installation from floppy disk.

If you update Disk #1 of the CD-ROM installation to include OS2LDR, please be
aware that this file will be overwritten from the CD-ROM. It may have to be
updated again on the boot drive when the installation has completed.

The above problems with OS2LDR and IBMINT13.I13 have been fixed in OS/2 Warp.
Therefore, the updates are no longer required. 								

This driver added a new switch named /PCIHW which enables the driver to 
ignore the PCI BIOS and access the PCI hardware registers directly. This
switch could be useful for the users having problems loading the AIC7870.ADD
included with OS/2 Warp, if their system has a non-compliant
system BIOS. 
   							
	BASEDEV=AIC7870.ADD /PCIHW

Intel Errata #8511 lists known data integrity issues with the 
processor cache on the Saturn-1 chipset (82424TX).  For this reason 
Adaptec recommends that processor cache be disabled via the CMOS 
setup to avoid data corruption.  For more information, see Intel 
Errata #8511.  You may get this from Intel's FaxBack system at 
800.628.2283 or 916.356.3105.  For more detailed information see 
Errata #8512 and 8513.  
					    
There is currently no support for installing OS/2 2.0 on a hard drive
attached to an AIC-7870, due to limitations in the installation procedure. 
Upgrading to OS/2 2.1 or higher is recommended.

                     ============================
                      Configuration Information:
                     ============================

Generic Command Line Switches for Adaptec Drivers and OS/2 2.1X and Above
-------------------------------------------------------------------------

OS/2 adapter device drivers (.ADD files) are normally installed 
automatically and require no further information from the user. However,
in certain situations the user may wish to modify the behavior of the 
driver to meet their specific needs.


***** IMPORTANT *****
Please proceed cautiously with the following information. If you have
purchased software which requires you to use switches, it should include
instructions on how to use them. Most software requires no switches and
you do not need to concern yourself with the information about switch 
settings.


The standard format for command line switches is :
BASEDEV=AIC7870.ADD [Universal Parameter][Adapter ID][Unit Parameter]
          {[SCSI Target ID]}

  [Universal Parameter] - An option that applies to all adapters 
           controlled by the driver.

  [Adapter ID] - /A:n, where n is the number (zero relative) of the adapter
           installed in the system. The adapter ID is determined when 
           the driver is loaded based on the order that adapters are 
           found in the system. (See below, AIC7870.ADD Specific Command
           Line Switches.)

  [Unit Parameter] - Modifies the behavior of the selected host adapter.

  [SCSI Target ID] - The targets to which the Unit Parameter will be applied.
           This parameter may be a single ID (d) or list of IDs (d,d,d).

Universal Parameters:
---------------------

   /ET - Allow embedded targets.  This parameter indicates that the ADD
      should assume that all targets have more than one logical unit (LUN)
      defined.

   /!ET - Do not allow embedded targets (DEFAULT). This parameter indicates
      that the ADD should assume that all targets have only one logical 
      unit (LUN) defined.

   /V - Load driver verbosely. This parameter will display the driver
      name as well as the version number and Adaptec copyright if the driver
      loads successfully. Information on all targets found in the system
      will also be displayed.

   /PCIHW  Enables driver to access PCI configuration hardware registers.
           This switch is implemented because in some PCI systems accessing
       	   PCI configuration space through PCI BIOS function calls causes
       	   problem.
       	   
General Unit Parameters:
------------------------

   /I - Ignore the specified adapter. This allows another driver to
      share the adapters that the ADD would normally use.

   /DM - Enable DASD manager support (DEFAULT). This parameter allows
      OS2DASD.DMD to control the specified target(s) if they are 
      identified as DASD (hard disk) devices.

   /!DM - Disable DASD manager support. This parameter prevents
      OS2DASD.DMD from controlling the specified target(s).

   /SM - Enable SCSI manager support (DEFAULT). This parameter allows
      OS2SCSI.DMD to control the specified target(s) if they are 
      identified as NON-DASD SCSI devices. All SCSI hard drives 
      will be controlled by OS2DASD.DMD.

   /!SM - Disable SCSI manager support. This parameter prevents
      OS2SCSI.DMD from controlling the specified target(s).


Configuration Examples:
-----------------------

Example 1

   Suppose that you had a removable hard drive as target 3 and you wanted
   to control the hard drive with an ASPI application and driver.
   Normally OS2DASD will allocate this device, treat it as a large
   floppy and prevent you from sending any SCSI commands via ASPI.

   BASEDEV=AIC7870.ADD /A:0 /!DM:3 will prevent OS2DASD.DMD from
   accessing the target and still allow OS2SCSI.DMD and OS2ASPI.DMD to
   share access to it.

Example 2

   Suppose that you had a multi-disk CD-ROM as target 4 on host adapter 0 and
   two DASD devices as targets 1 and 5 on host adapter 1.

   BASEDEV=AIC7870.ADD /ET /A:0 /!SM:4 /A:1 /!DM:1,5 will prevent
   OS2SCSI.DMD from accessing the CD-ROM and prevent OS2DASD.DMD from
   controlling the DASD devices. The driver will also search for multiple
   LUNs on all host adapters.

Important Tips:
---------------

  1) There are no switches for controlling OS2ASPI.DMD directly. IBM did
    not define them in their specification and we cannot be sure that other
    host adapters will have the same switches.

  2) OS2SCSI.DMD will only allocate devices when a device driver
    requests it, but this will prevent OS2ASPI from accessing it. There is
    nothing in the ASPI specification regarding device allocation so
    OS2ASPI must rely on other managers to fairly share targets. This
    should only be a problem if you have two drivers that use different
    managers and you want them both to access the same target at the same
    time.

  3) Do NOT disable DASD manager access to target 0 if you are booting
    from your SCSI host adapter. This will prevent the system from booting!


AIC7870.ADD-Specific Command Line Switches
------------------------------------------

This driver supports the AIC-7870 installed on an AHA-2940 PCI host 
adapter.  Adapter numbers are first assigned to boards with their BIOS 
enabled; the numbers are assigned from lowest BIOS address to highest 
address.  Any remaining boards are assigned numbers by scanning slots.  
Each slot is a combination of a bus number and a device number pair 
starting from lowest to higest numbers, and the adapters are assigned a 
number in the order they are found.  


Special Unit Parameters:
------------------------
      /TAG: - Sets the number (1-16) of tagged commands for all target
              devices on the host adapter. A value of one disables 
              tagged queuing. 16 is the maximum number allowed and 8 is
              the default value.

      /TAG:1  Disables tagged queuing for all target devices on a given
              host adapter. The driver maintains a maximum of 2 non-
              tagged commands per target internally. The driver treats
              all target devices as non-tagged devices, and sends only
              one command at a time per target to the host adapter.

       Example:

       BASEDEV=AIC7870.ADD /A:0 /TAG:8
               will set the number of tagged commands for all target
               devices on the first host adapter to 8.
               

                           ==============
                            Limitations:
                           ==============

     Fault Tolerance is now supported in the driver. However, ABORT and 
     SCSI BUS RESET will only work for targets that are properly
     behaved.

