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
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Casio fx-4000P Scientific Calculator from 1985 - YouTube
Casio calculator FX-4000P (nº 117) – Casio 880
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Casio fx-4000P : r/calculators
From the first BASIC to Casio fx-4000P calculator! - YouTube