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INT 10 - VIDEO - SAVE/RESTORE VIDEO STATE (PS50+,VGA)
        AH = 1Ch
        AL = 00h return state buffer size
                Return: BX = number of 64 byte blocks needed
             01h save video state
                ES:BX -> buffer
             02h restore video state
                ES:BX -> buffer containing previously saved state
        CX = requested states
             bit 0 video hardware
                 1 BIOS data areas
                 2 color registers and DAC state
              3-15 reserved
Return: AL = 1Ch if function supported