I already posted this in the ballistics programs thread that is tacked to the top of this index, but haven't gotten any responses so I am going to try a new thread. I don't currently have the funds to a pda, but do have a ti-86 graphing calculator. does anyone know of a ballistics program that I could change into z80 (?) language so the calculator can recognize it. I don't have any programming software, but do know how to write programs in notepad and transfer them to my calculator. Any help on this would be appreciated. If you know of one that is already written for the ti-86, that would be even more helpful.