Prof. Abel Méndez 🔭 🔬 on X: "My high school student calculator, a CASIO FX-4000P, and my university professor calculator, a TI-Nspire CX II CAS. 35 years apart. 🙂 https://t.co/9bq6sk6zLZ" / X
Vintage 1985 Casio FX-4000P Scientific Calculator, LCD Screen, Parts Only | eBay
MyCalcDB : Calculator Casio fx-4000P
Guia Usuario Casio FX-4000P | PDF
My F91W and Gold A158 next to a fx-4000P Scientific Calculator that I inherited from my Grandpa (purchased during his career at Lockheed Martin). : r/casio