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INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS) - DISPLAY-SWITCH INTERFACE
        AH = 12h
        BL = 35h
        AL = 00h initial adapter video off
             01h initial planar video on
             02h switch active video off
             03h switch inactive video on
             80h *UNDOCUMENTED* set system board video active flag
        ES:DX -> buffer (128 byte save area if AL = 0, 2 or 3)
Return: AL = 12h if function supported
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