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ElectroDuende · 11-18-2015, 12:15 PM

(11-18-2015 11:43 AM)benno Wrote: First of al, I'm no calculator collector at al.

But I got hold on this strange HP41CX calculator, and I'm trying to find information about.
Until know I didn't find much. So maybe some of you can help.

Here are some pictures:

Seems to be some kind of "enviromental" overlay for surveyors (according to the markings). There was an "official" HP protective overlay, that could be easily removed, but this one may be permanently bonded... does it allow the use of Alphe, user and program buttons? Some HP41's were sold with a fixed overlays and fixed ROM packs, that were intended to only be used for a specific task.