<<Are all 82 programs compatable with the 83? I'm looking to buy a TI for my last year of high school and university and I'm still trying to decide between the 82 (used in our schools) and the 85.>> They are all compatible, but they may not run right without slight modification if it wasn't pregrammed will, because of the new way the 83 handles things such as 3*5/2 -Josh Wardell http://users.aol.com/jwardell/JWardell.html