Well... please don't flame me, but actually I don't own a single TI calculator, even though I have something like 5 HPs.
Anyway, my reason being here is that I have a home brew Z180 computer (with BASIC interpreter orginally "borrowed" from the swedish ABC-80), and even though I have been working with it (or its predecessors) something like 30 years, I still found out that I occasionally need some help from the web.