HP-41C Extended Functions - 4K module?

[hth]

Sylvain is correct, it is a 4K module with RAM for the extended memory.

Both the Time module and the Extended functions are 4K modules with extra abilities. They are both filled to the brim and there is little room for anything else. I suspect that HP had more that could not be fitted in and had to prioritize.

When HP made the 41CX they added extra abilities, like extended catalogs. As both the mainframe (12K OS code was full), and the TIME modules and Extended function took 4K each (also full), the extra code had to go somewhere. The solution was another page (the banked one). This called for some reorganization of the code (preserving entry points). Now there were plenty of room making it possible to add extra functions. In fact, there is even a large gap of unused memory in the 41CX.

Håkan