I was hunting through the loft to find some HP41 mode programs and found these magazine articles about the custom HP41 case and ROMs that Zengrange produced for the British Army in the mid 1980s.
http://www.hpcc.org/calculators/Morzen_Gunzen.pdf
Thanks for sharing the article, nice to see how all that was done. The military applications are not my favorite subject but I acknowledge the useful solution they put together back then.
The software in the modules is good quality, as you'd expect from Zengrange. Has any manual ever surfaced? That'd be very interesting to peruse...
Thanks Mark,
Now have a history for the case I place my 41cl in. Always take it through London security. Raises some eyebrows!
Geoff