They haven’t been produced in decades, but [Chris Chung] has used some open source code to create DIY hardware version of the HP-41 Reverse Polish Notation (RPN) calculator. The open source code ...
The most recent case of that was the PX-41C, a replica of the classic HP-41C. Nicely bagged parts. The HP-41C is a somewhat legendary reverse-polish notation calculator. I still have my original ...
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