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 ...
Best rummage sale find ever! Sometime in the 1980s when I was a spotty teen, I picked up a calculator at a rummage ... You can still buy an HP that uses RPN, and indeed not so long ago their ...
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