Yeah I am using it for problems in my Systems class. I can do it manually but the time it takes to do inverse laplace, the intense algebra involved and the ease in making a stupid mistake, can cost a great deal of time and headache on a time based test. Specially the ones given by my professor who expects us to take up the full three hours of his final exam. That is why I am looking for a program so I can at least do the transforms on the calculator, so i can spend more time on the fourier portion, and then go back, if time permits, and do the laplace manually. I guess no-one can repond to if the TI-85 does have a program available. If anyone knows, please post. TICALC.org does not.