Any HP 50g emacs/SDiag users?

[rprosperi]

I can't answer your specific questions, but these links may interest you:

HELP49: http://www.hpcalc.org/details.php?id=5962
When looking at SDIAG, I found this, and chose this one.

Prof. Rautenberg's Tools: http://www.math.fu-berlin.de/users/raut/WR49/index.htm
The author of OT49, he has provided a large set of similarly cool and powerful tools you will likely enjoy.