HP 35s/RPN replacement I found out sometime last year that the HP 35s, seemingly the last of its kind, was discontinued a few years ago. I have a few that are over 15 years old and still work well, though one has...

HP 35s/RPN replacement #HP35s #RPNCalculators #DiscontinuedProducts #CalculatorEnthusiast #LegacyTechnology

NP34 calculator made by Chris Chung, based on my Nonpareil microcode-level simulator for HP calculators, showing sin(60⁰) PC board with tact buttons, two five-digit secen-segment LED displays, CR2032 coin cell, and 3D-printed bottom case (no top case)

NP34 calculator made by Chris Chung, based on my Nonpareil microcode-level simulator for HP calculators, showing sin(60⁰)