Int 11 Fn FF  - Wd7000 Sdlp Interface - Execute Generic Scsi Command       [d]

   AH = FFh
   SI = 6A6Ah
   AL = SCSI Addressing (see #0162)
   CX = bytes of data to be transmitted (max FFF0h)
   DH = 00h
   DL = length of SCSI Command Descriptor Block
   DS:DI -> SCSI Command Descriptor Block
   ES:BX -> data buffer

Return: CF set on error
       AL = error code
   CF clear if successful

Note:  because of busmaster operations with WD7000FASST avoid accessing
     video memory directly; check 386 memory manager for VDS support.
     The WD7000XTAT works with programmed IO and does not have this
     limitation.

See Also: INT 21/AX=4402h"ASPI",INT 2F/AX=7F01h

Bitfields for SDLP SCSI addressing:
Bit(s) Description (Table 0162)
 2-0   SCSI Target LUN (logical unit number)
 5-3   SCSI Target ID
 7 write flag, set for write operations, clear otherwise