Casio fx-4000P | A collection of programmable and non-programmable calculators
Casio fx-4000P (1985) - Casio - LastDodo
Vtg Casio FX-4000P Scientific Calculator Works New Batteries - Loose Faceplate | eBay
Guy Leech on Twitter: "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