George Stagg on Twitter: "I'm currently suffering with Covid-19. In "celebration", here is a twitter thread describing my Covid lockdown project: hacking a Casio CFX-9850G calculator, from 1996 with 32KB of RAM
Casio CFX-9850G Handheld Electronic Calculator | National Museum of American History
CASIO CFX-9850G PLUS calculator, 興趣及遊戲, 手作&自家設計, 其他- Carousell
casio calculator cfx-9850g - Study Tools - 174601752
Whats inside a CASIO CFX-9850G
Casio 9850 series - Wikipedia
Casio CFX-9850G graphing calculator | eBay
Casio - CFX-9850GB PLUS - - Graphic calculator - Casio CFX9850GB PLUS - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA