alt Hacker NewsI have an old HP 15C RPN scientific calculator.
- I know where the buttons are without looking.
- It has functions my Android calculator does not have (directly or that I know of).
- It has a strange satisfying tactile feedback.
- It never interrupts me. Ever.
- It never distracts me. Ever.
I reach for it frequently.
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IMHO the HP 15C RPN is the best calculator ever made. I still have the original with the slip case and manual. However, more often these days i just use my phone's calculator without RPN (i don't need to do a lot of complicated math for mechanical engineering -- we use tables for most stuff). I reached a point/decision several years ago to protect my HP 15C for posterity.
I've never owner any other piece of technology with buttons this good.
It is really a lost art.
I can't think of another electronic device that has survived and remained useful for half the 43 years my 15C has - through two years of high school, a math degree, and an entire software engineering career. When I calculate something any other way, it involves thinking about what my thumbs automatically do on my 15C and translating that.
When I'm away from it, there's a wonderful emulation of the 15C (and 16C) at https://jrpn.jovial.com. The numeric algorithms behave identically as far as I can tell, and it even includes the back panel (3-dot menu near the logo, then "Help"). The visuals make me feel right at home. If only they could reproduce the tactile experience.