INT 11 - WD7000 SDLP interface - EXECUTE GENERIC SCSI COMMAND
AH = FFh
SI = 6A6Ah
AL = SCSI Addressing
bits 2-0 SCSI Target LUN (logical unit number)
bits 5-3 SCSI Target ID
bit 7    write flag, set for write operations, clear otherwise
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: 214402

11FF - WD7000 SDLP interface - EXECUTE GENERIC SCSI COMMAND