Int 10 Fn 4F04  - VESA SuperVGA BIOS - Save/restore Supervga Video State   [V]

   AX = 4F04h
   DL = subfunction
       00h get state buffer size

       Return: BX = number of 64-byte blocks needed
       01h save video states
       ES:BX -> buffer
       02h restore video states
       ES:BX -> buffer
   CX = flags for states to save/restore
       bit 0: video hardware state
       bit 1: video BIOS data state
       bit 2: video DAC state
       bit 3: SuperVGA state

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