Guy Leech on X: "It lives! This @Casio fx-4000P programmable calculator was bought for me by my late Dad's company as payment for writing some software (in compiled BASIC) for them whilst
Casio fx-4000P | A collection of programmable and non-programmable calculators
CASIO fx-4000P MADE IN JAPAN PROGRAMMABLE SCIENTIFIC CALCULATOR CASIO fx 4000 P - FUNCIONANDO AÑOS 80 Calculadora de … | Graphing calculator, Calculator, Graphing
Vintage Casio fx-4000P Scientific Programmable Calculator With Manual Book | eBay