Comment by readingnews a day ago
I 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.
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.
I've never owner any other piece of technology with buttons this good.
It is really a lost art.