Another calculator, Casio FX-850P - I still use it today : r/vintagecomputing
The Casio FX-850p Pocket Computer circa 1987, upgraded to 16k so that you can compute anything anywhere anytime! (portable week) : r/retrobattlestations
Vintage CASIO FX-850P Personal Computer Calculator | eBay
Calculators
Casio FX-850P - TheCalculatorStore
Vintage Casio FX-850P Personal Computer / Vintage Pocket - Etsy Finland
Casio fx-850p Personal Computer Calculator Scientific Library 116 | eBay
Casio - The FX-850p series - - Pocket computer - Casio The FX850p series - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA