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I LOVE my HP-16c RPN programmer calculator! Bought it around 1978 and still works great. The batteries last many years. I’ve probably only changed batteries about 4 times. On Apple stuff, PCalc is the RPN calc I’ve used for many years.

Tom Salzer KJ7T's avatar

Thanks for this! A 16C still going strong after all these years says a lot about how HP built them back then. Batteries that last for years, keys with that solid soft click, and RPN that becomes second nature once it lands. The 16C's hex, octal, and binary modes must have made it a natural fit for programmers. Good tip on PCalc, too. It's nice to know RPN is alive and well on modern devices.