My Dad, a former slide rule warrior in his college days, taught me at least basic multiplication and division with a slide rule. I still have the plastic one he bought me when I was a kid.
When I went off to college I begged and pleaded with my parents to replace the little Casio "scientific" calculator I used in high school with an HP 11C. They finally relented and allowed me to spend the outrageous sum of $40 for the calculator. How quaint is that these days? $40? Anyway, I was nearly instantly addicted to RPN and four registers instead of a single value memory. Such luxury.
The next year I sold my 11C and splurged for a 15C ($70!) because of the matrix functions. They were really useful in statics and dynamics classes. Finally, in my junior year, jealous of the HP-48 owner, I sold my 15C and bought that 42S ($200!!) I posted earlier today. I even programmed it a bit. Like I had a scare a few years ago when I dropped it and it stopped working. I was able to find a man who repaired HP calculators. He was having issues in his personal life, but finally fixed my calculator and then promptly retired. I am super-extra careful with it now.
A few years ago I missed my 15C so I started stalking eBay and got an original, not a reissue, in decent condition, but I had to pay $200 for it. At least they were 201x dollars, not 1998 dollars.
It's amazing how slow it is.
When my daughter was in high school I bought her an HP-xx, I can't remember the model, but
@ghfiii posted a photo of it a bit earlier. It was so complicated neither of us figured out how to use it. I miss classic HP calculators. To me, the pinnacle of purpose-built devices of their kind. I, like
@AudioGal, like the little tactile "snap" of the keys. Excellent ergonomic touch. For that reason alone I don't have an emulator on my phone.