INT 21 - DOS 2.25, Far East DOS 3.2+ - SET KOREAN (HANGUL) INPUT MODE
        AX = 6301h
        DL = new mode
            00h return only full characters on DOS keyboard input functions
            01h return partially-formed characters also
Return: AL = status
            00h successful
            FFh invalid mode
SeeAlso: AH=08h,AH=0Bh,AH=63h,AX=6302h