NSIDEOS2 Device Driver Documentation
	       ------------------------------------


	Enclosed is the NSIDEOS2.ADD. It contains a number
	of changes from the previous driver. This note is
	intended to help explain those changes.


	Summary of Changes
	------------------

	Multiple Controller support

	- 2 independent controllers can be supported per instance
	  of this driver.

	- Multiple instances of the driver may be loaded

	- Support ATA-2 PIO Mode 3



	Command Line Switches
	---------------------

	 Sample Command Lines:

	 BASEDEV=NSIDEOS2.ADD /V /A:0 /U:0 /GEO:(1314,7,26,-1) /A:1 /I

	 BASEDEV=NSIDEOS2.ADD /V /A:1 /P:120 /U:0

	 BASEDEV=NSIDEOS2.ADD /V /A:1 /U:0 /GEO:20


	 Switch definitions:

	   /V = Verbose Mode

	   Displays controller status and drive geometry information
	   during OS/2 initialization.


	   /A:0 = Adapter number

	   Adapter 0 has default parameters for a primary adapter.
	   Adapter 1 has default parameters for a secondary adapter.


	   /U:0 = Unit Id

	   Unit 0 indicates parameters apply to the master unit.
	   Unit 1 indicates parameters apply to the slave unit.


	   /GEO:(1314,7,26,-1) or /GEO:20 = Drive geometry override (dec)

	   Indicates the Cylinder/Head/Sector geometry for the drive.
	   The fourth parameter is the Write Precompensation Cylinder
	   which may be omitted for drives which do not require
	   precompensation.

	   As an alternate format standard BIOS drive types may
	   be used. Types (0-47) are supported. User defined types
	   48, 49 should be entered directly by in the previous
	   format.

	   When specified, this parameter overrides other geometry sources.
	   If this parameter is absent, other geometry sources discussed
	   above will be used.


	   /I = Ignore adapter

	   The driver automatically attempts to locate and initialize
	   both the primary and secondary adapters. In some cases other
	   DASD controllers may appear between the primary and secondary
	   IDE controllers. In these cases the system should be configured
	   as follows:

	   BASEDEV=NSIDEOS2.ADD /V /A:1 /I
	   BASEDEV=MOREDASD.ADD
	   BASEDEV=NSIDEOS2.ADD /V /A:0 /I



Note !!!
     1. For OS/2 Warp 3.x ATAPI CD-ROM driver C:\OS2\BOOT\IBMIDECD.FLT
	date code later than 10-06-94, if an ATAPI CD-ROM drive was
	installed as Master drive at 2nd IDE port and no slave drive at 2nd IDE
	port, then must add the command line option "/master" as follow:

	BASEDEV=NSIDEOS2.ADD /master