Cleaning and trying out a Casio FX-850P pocket computer - YouTube
Manual Casio FX-850p – Casio 880
Index of /commun/images/ordinateurs/casio
Service Manual & Part List - Casio FX 850p - 1987 | PDF | Random Access Memory | Integrated Circuit
The Casio FX-850p Pocket Computer circa 1987, upgraded to 16k so that you can compute anything anywhere anytime! (portable week) : r/retrobattlestations