may be a blond question - does the Memory Extension Module HP82106A work in a HP-41 CX?
I though yes (or actually did not thought about this question at all), but now, when I bought 2 of those modules at ebay, it seems that I was wrong. Not a single Register was added when I plugged them in.
In my manual for the HP-41 CX only the X Memory HP 82181A Module is mentioned as memory extension. Is it so that the CX memory can only be extended with the X Memory Module?