Int 10 Fn 4F13  - Vesa Vbe/ai (audio Interface) - Open Device              [s]

   AX = 4F13h
   BX = 0003h
   CX = handle
   DX = API set (16/32-bit)
   SI = segment ???

Return: AL = 4Fh if function supported
   AH = status
       00h successful
       SI:CX -> memory ???
       01h failed

See Also: AX=4F13h/BX=0000h,AX=4F13h/BX=0002h,AX=4F13h/BX=0004h