INT 10 - VESA SuperVGA BIOS - SAVE/RESTORE SuperVGA VIDEO STATE
        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

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