I will fully admit to being an idiot... if I'm missing something obvious. Otherwise it's a simple struggle with the TVM routine (the enhanced one that is with the ver 3.2 build.) The text file accompanying the routine didn't give me the clues I was looking for. I entered a value, then A followed by A for N, and a new value, then A followed by B for I, and so forth, skipping D because I wanted to solve for "PMT" -- But then -- everything I tried (followed by D to solve for PMT) gave me ridiculous answers or square roots, which doesn't seem helpful.
Apologies to Franz who wrote the routine if my blindness indicates simple low IQ.... might I suggest a couple of "examples for dummies" in the text file along with keystrokes? It's the only thing keeping me from using the WP34s as my regular machine.