X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2f - multiplex - dos 3+ internal

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INT 2F - Multiplex - DOS 3+ internal - GET FILE'S DRIVE
        AX = 121Ah
        DS:SI -> filename
Return: AL = drive (0 = default, 1 = A:, etc, FFh = invalid)
SeeAlso: INT 21/AH=19h,60h

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