My grandmother used Ubuntu for years. I setup autologin and put a Firefox shortcut on the Desktop. The next time a problem cropped up was when the LTS support ended
Same here. I missed the lecture of many math classes figuring out basic on my ti84+. I mostly wrote simple games. The calculator made it easy to experiment since all the functionality could be found in menus or a button somewhere.
Funny enough, the parent company Mizkan is a Japanese corporation.