Int 10 Fn 4F05  - VESA SuperVGA BIOS - CPU Video Memory Control            [V]

   AX = 4F05h
   BH = subfunction
       00h select video memory window
       DX = window address in video memory (in granularity units)
       01h get video memory window

       Return: DX = window address in video memory (in gran. units)
   BL = window number
       00h window A
       01h window B

Return: AL = 4Fh function supported
   AH = status
       00h successful
       01h failed

See Also: AX=4F01h,AX=4F06h,AX=4F07h,AX=7000h/BX=0004h