Casio fx-4000P Scientific Calculator from 1985 - YouTube
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Eddie's Math and Calculator Blog: Retro Review: Casio fx-4000P
FX-4000P Owner's Manual | Oxfam Shop
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CASIO fx-4000P scientific calculator from 1986
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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
