If RPN interests you, it’s a subject we’ve looked at in greater detail in the past. All the resources can be found in a GitHub repository, so if RPN is your thing there’s nothing to stop you building one for yourself. The key legends are a set of printable stickers, which when printed on self-adhesive laser film prove durable enough to last. It runs from a CR2032 which is more than can be said for some modern styles of calculator, and it gives the user everything you could wish for in a scientific calculator. This glorious specimen is an open hardware RPN calculator with more than a nod to the venerable Hewlett Packard HP42 in its design.Īt its heart is an STM32L476 low-power ARM processor and a Sharp Memory LCD, all on a PCB clad in a 3D-printed case you’d have been proud to own in the 1980s. Since classic models from the 1970s and ’80s are rather pricey, ’s just build his own called the OpenCalc.
Unfortunately for RPN enthusiasts, the RPN calculator is a little on the rare side. Why reach for a bland, commercially available calculator when you be using a model that employs RPN (Reverse Polish Notation) in its calculations and be a custom build all at the same time? The kids may have colour TFTs and graphing functions, but your keyboard has no equals sign, and that means something.
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