Int 15 Fn 5380  - Apm Sl Enhanced V1.0 - Sl Hw Parameter                   [p]

   AX = 5380h
   BH = 7Eh

Return: AL = ???
       03h on A-Step 386SL BIOSes
       12h on later steps
   BX = Control port (00B0h)

See Also: AX=5380h/BH=00h,AX=5380h/BH=7Fh