My first programmable calculator was a TI-83+ that I got for my freshman Honors Geometry class.  I started programming then and continued.  My Junior year I programmed my TI-83+ so that it could do integrals and derivatives, but it is not quite perfect, so I am not sure if it will appear here.

 

This year, I decided to get a TI-89 Titanium since I will need it next year and so I could use it on my AP tests this year.  The programming language changed (improved), but I caught on and most of my new programs will be for the TI-89.