Looking for TVM formulas

[Dave Britten]

Looking good so far. I've got direct solutions for PV, PMT, and FV working. Once I integrate the numeric solver (ported directly from the one built in to the HP 20S, roughly 160 steps), the program should weigh in around 600-650 steps. Maybe another hundred or so when I add amorts, though I have to learn how to properly handle beginning/end modes in that context.

The more I mess with this TI-95C, the more I like it. It does a lot of things that even their later graphers don't (indirect branching and addressing, most notably). You can also directly read/write bytes, and branch to assembly routines at any address, so keying in ML programs probably isn't out of the question (but way beyond my current capability with the thing).