HP 41C solver problem

[rprosperi]

I dug out my original 41 boxes, and both had their original N Cell battery boxes safely inside.

On the left, the box that came with my original 41C (early 1980) and on the right, the box that came with my 41CX (Aug '83), straddling my latest '41, a V5 41CL, sporting a CCD ROM keyboard overlay (for Angel's OSX3 ROM, a permanent part of both of my 41CLs)

I did not recall the "Energizer" brand name went back that far; it appears it was coined between 80-83.

Seems I was both right and wrong about my box differing from Massimo's.