> > > > I have a Ti-82. It's the same Ti-82 I've always had, and I got by just fine with it through all kinds of Calculus.
> > > >
> > > Wow. Our teachers are rather picky. I've only experienced 81s and 83s. Is an 82 much different?
> >
> > The 82s are much different from the 81s, but fairly similar to the 83s.
>
> More advanced, less advanced, or just different?

They have many more features than the 81. They have roughly the same feature set as the 83 (sans the finance stuff which can be written in about three seconds), just with less memory.