This is probably right, but just to note that it's very much a generational thing. When I got a TI-83 (and then eventually an 89!) it was easily the most advanced handheld computing hardware I had ever been exposed to. The iPhone made sense to me, and I knew it would be huge, the day it came out because of these amazing calculators.

I know technology has moved on and all, but much nostalgic respect to these amazing calculators.