X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 3.3+ internal

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INT 21 - DOS 3.3+ internal - SET ???
        AH = 64h
        AL = flag
                00h  ???
            nonzero  ???
Return: nothing
Notes:  affects operation of AH=08h
        called by DOS 3.3+ PRINT.COM

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