Int 7D Fn 02  - Scsilink - Send Command                                    [-]

   AH = 02h
   ES:BX -> parameter block (see below)

Return: CF clear if successful
   CF set on error
       AL = initiator error
       AH = target error
Desc:  send the specified command block to the target device and perform any
     related I/O

Format of parameter block:
Offset Size    Description
 00h   DWORD   size of command block
 04h   DWORD   address of command block (see below)
 08h   DWORD   size of buffer
 0Ch   DWORD   address of buffer

Format of command block:
Offset Size    Description
 00h       info not yet available