INT 7D - 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

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