Why Do Ancient Graphing Calculators Still Cost So Much?
Casio FX-820P Personal Electronic Computer with Case | eBay
1980)s - One of the weirdest ads ever, a calculator/lighter combo, the Casio QL-10, from the 1980s (and no, I'm not making it up, this was actually a thing) : r/TheWayWeWere
The Casio Secret Sender was the original messaging gadget | Mashable