Hi,
I am working on a open source HP41 simulator for the Android platform (http://android41cv.sourceforge.net/). I have implemented most of the functionality. I still miss to implement the SDEV function but I have not found out how the 41CV calculates the standard diviation based on Σx, Σ(x^2) and the number of x's.
I guess someone at forum.hp41.org knows the answer
Regards Martin