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X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - doubledos - installation check http://www.X-Hacker.org [<<Previous Entry] [^^Up^^] [Next Entry>>] [Menu] [About The Guide]
INT 21 - DoubleDos - INSTALLATION CHECK
        AX = E400h
Return: AL <> 00h if DoubleDos is active
        AL = 02h if caller is running in the invisible partition

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