HP-41C Extended Functions - 4K module?

[Dan Grelinger]

(03-01-2018 05:43 PM)hth Wrote:  Sylvain is correct, it is a 4K module with RAM for the extended memory.

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In fact, there is even a large gap of unused memory in the 41CX.

Håkan

Thanks for the good information. I knew there was some extra space in the HP-41CX ROM allocation as Monty (41CL architect) was able to add functionality (to restore the 41CL functions in case they get unmapped by accident).

As an aside, it is not hard for me to believe that the extended functions ROM space was totally consumed in order to provide the significant functionality that module provided. However, the TIME module provides relatively few functions (29) for its 4K ROM space, and many of these simply set a Boolean flag (e.g. MDY, DMY, CLK12, CLK24, CLKT, CLKTD) and none seems to have a lot of required code to support their functions. I would have assumed that module would have a bunch of space left over.