Rhodri Marsden on Twitter: "Let's hear it for the Casio fx-85 solar powered calculator, just discovered in a box in the loft and still working perfectly 35 years after it was bought.
Casio Fx-82a Vintage 80s Calculator - Etsy
Casio - fx-82A - - Scientific calculator - Casio fx82A - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
CASIO FX 82A Vintage Scientific Calculator Fully Working - PicClick IT