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INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA, MCGA) - GRAY-SCALE SUMMING
        AH = 12h
        BL = 33h
        AL = 00h enable gray scale summing
             01h disable gray scale summing
Return: AL = 12h if function supported
SeeAlso: AX=BF06h
See Also: 10101B
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