X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 10 - video - alternate function select (vga, mcga)

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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=101Bh

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