One of my friends has accelerate his Ti-92. And it's very very fast! (http://cccsrv.trevano.ch/~blutz/TI92Spec/TIAccelerate.html). But aren't there any problems with the garanty or else? And if there isn't any problem, why didn't Texas Instrument used this when they made the Ti? (my friend says that it is because of the batteries) Thanks! fred.