Solar-powered calculators

[Dave Britten]

That fx-995 looks pretty neat! Though based on my experience with the membrane keyboards on the fx-7500g, fc-1000, and SF-3500, it's probably not an optimal typing experience.

I also forgot about the Casio CM-100 - it's kind of like a poor-man's HP 16C. Not programmable, and limited to 32 bits, but a pretty decent computer science calculator overall. It's actually a bit easier to scroll through long binary values than on the 16C. No batteries in this one, as far as I can tell.

https://casio.ledudu.com/pockets.asp?type=1300&lg=eng