Hello!

[hth]

When you put in fresh batteries, make sure you use 1.5V N cells. More than one HP-41 have been killed by 12V remote door opener batteries which have similar size.

You will find that most modules are compatible with your calculator (apart from HP-41C style memory modules, which are not needed with the CV/CX). The incompatibilities you may encounter will be in between certain modules. Most such issues are related to the XROM ID being the same.

You do not need to search for physical modules either, as images can be found online and used with a reprogrammable module (Clonix). If you just want to try something out, an HP-41 simulator running on a computer may be an alternative.

Håkan