I have entered a program on my ti-89 titanium. It is basically newton's quotient f'(A)=f(A+H)-f(A)/H. I I chose new program, named it diffq and wrote the program; basically the same as the download from http://math.arizona.edu~krawczyk/calculator/TI89/TI89DQ.html. I am having a great deal of trouble trying to run the program on my TI-89 titanium. I called ti tech support and they do not answer running program questions. Can anybody tell me how to run this program?