DOS DRIVER COMMAND LINE OPTIONS
-------------------------------

  For default operation using PIO data transfers, no command line options
  are necessary for the DOS driver.  To enable DMA transfers, use the /E
  option.  Optimal performance may be obtained via the /A option.  The
  remaining options will be of interest only to power users.  To enable
  command line options, append them to the DEVICE=CMD646X.SYS line in your
  CONFIG.SYS.

  NOTE:  If you have a hard drive larger than 528 MB, the DOS driver
  will automatically switch to Extended CHS translation mode if your
  BIOS supports it.  If your BIOS does not support Extended CHS
  translation, then only the Secondary IDE port will be able to
  support the full capacity of your drive via Extended CHS translation.
  If you prefer LBA translation mode, specify /L.

  /A<lbs> : Enable Advanced Timing modes.  When this option is 
       specified, the driver queries the drive(s) for supported
       IDE timing modes.  The driver then sets up both the drive(s)
       and the CMD Local Bus IDE controller for the fastest supported 
       timing mode(s).  <lbs> specfies the local bus (PCI or VL-bus) 
       clock speed in MHz.  Valid values are between 20 and 50.  
       WARNING:  Disk access may be unreliable if the local bus speed 
       is incorrectly specified.  If you are unsure of your local bus
       speed, use <lbs>=50 until you determine the actual speed.
  /B : Disable writeback cache.  Some drives have an internal write-
       back cache.  By default, the driver enables it.  This switch
       prevents the driver from enabling it.
  /D : To display detailed information.
  /E : Enable DMA.  Drives which support DMA will use DMA data transfer;
       drives which only support PIO will use PIO transfer.  /O may be
       used to override a specific drive.
  /F<port> : Force the DMA base address register (Base Address Register 4,
       offset:20h in PCI config space) to <port>, where port is in decimal.
       If <port> is not specified, 500h is used.  Normally, this parameter
       should not be used, unless DMA operation fails due to BIOS problems.
  /I<irql> : Specify IRQ level for Secondary IDE port.  Normally, the
       driver assumes IRQ 15.  Therefore, if you are using an IRQ level
       other than 15, you must specify /I.  Allowed values for <irql> 
       are 8 through 15 inclusive.
       NOTE: During loading of the driver, you may cancel scanning of the
       Secondary IDE port by pressing <ESC>.
  /L : Enable support for LBA mode.  The driver will use LBA mode to access
       drives which support it, rather than CHS or Extended CHS.  Since some
       drives have bugs in their LBA mode support, it is not recommended to
       use this parameter.
  /M<nblk> : Maximum Multiple PIO sector count.  This parameter only applies
       to drives which are accessed using PIO when /S is not specified.
       <nblk> specifies an upper limit for the number of sectors per block
       for READ/WRITE MULTIPLE commands.  When using multitasking operating
       systems, /M8 or /M16 will typically yield the best performance.
  /N : Narrow IDE.  Perform 16-bit wide PIO at all times rather
       than 32-bit.  This parameter is ignored on drives which are in
       DMA mode.
  /O<port><drive><type><mode> : Override transfer mode Mode.  Some drives
       have firmware bugs which cause them to report incorrect transfer mode
       information to the driver.  For instance, many Mode 2 drives are
       really Mode 0, and some DMA drives can't really support DMA reliably.
       By default, the driver automatically selects the fastest mode which a
       drive claims to support.  The user can override this mode by using /O.
       /O overrides /E on a per-drive basis.
       WARNING:  The driver does no sanity checking on drives for which /O
       is specified.  Using /O to set a drive to an unsupported transfer mode
       may cause data corruption!
       
	 port  : 0=Primary IDE, 1=Secondary IDE
	 drive : 0=Master, 1=Slave
	 type  : P = PIO, S = Single Word DMA, M = Multiple Word DMA
	 mode  : mode number: 0-5 when type = P
			      0-2 when type = S
			      0-2 when type = M
  /P : Pause at end of driver init and wait for user to strike a
       key.  Useful for viewing diagnostic messages at boot time
       before they scroll off the screen.
  /Q<irql> : override default IRQ level for Primary IDE port with
       <irql>.  irql must be between 8 and 15.
  /S : Single mode.  Use single read/write IDE commands rather than
       multiple read/write commands for drives being accessed in PIO mode.
  /T : Truncate Mode.  If your BIOS does not perform translation on
       drives larger than 528 MB (i.e. it limits drives to 1024
       cylinders), then you must specify this switch if you wish the
       Secondary IDE port to also truncate.  If this switch is not
       specified, the Secondary IDE port will always use translation, which
       will allow you to access the full capacity of the drive.
  /V : Don't perform verify even when requested.  This isn't really
       very risky when SMARTDRV is loaded, since SMARTDRV already
       disables verify when write-caching is enabled.
  /X : Exclude Primary IDE tunings.  If your BIOS automatically sets
       up the Primary IDE port and drive timings, the DOS driver will
       normally override them when you specify /A.  When /X is
       specified, the driver will only setup drive timings on the
       Secondary IDE port.
  /Y : Normal Seeks.  Disable Turbo seeks.  When /Y is specified, the 
       driver will send normal seek commands to the drives.

   EXAMPLE:
      device=c:\quickcmd\cmd646x.sys /v /a33 /i15 /o01S0

   EXPLANATION:  
    /v : ignore any requests for verify.
    /a33 :  enable optimal performance timings for a 33 MHz local bus.  
    /i15 : the Secondary IDE channel uses IRQ 15.  
    /o01S0 : force the Primary IDE slave drive to use Single Word DMA Mode 0 

