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Joined: Nov 2005
The 82106A is a memory module for the HP-41C You can plug up to 4 of these into a 41C.
A 41CV or a 41 CX already have the equivalent of 4 of these built in, so they're no use wuth these calculators. Each module is 64 registers (from memory)
To see if they're working is not a trivial matter. Plugging these things in increaces the number of registers available. So the first thing to do is find out how many registers you have. Then plug in a module and see if you've got 64 more.
The modules lose their contents almost immediatly on removal.
Don't plug or unplug the modules while the calculator is turned on.
Removing a module in certainn circumstances will lead to MEMORY LOST.