![Casio - TR-4000 - - LCD calculator - Casio TR4000 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA Casio - TR-4000 - - LCD calculator - Casio TR4000 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA](https://casio.ledudu.com/images/calculs/casio/machines/zoom/tr4000.jpg)
Casio - TR-4000 - - LCD calculator - Casio TR4000 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
![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 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](https://pbs.twimg.com/media/ErCztRRXYAAnIdC.jpg)
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 | Pocket calculators, Calculator, Computer history Casio fx-4000P | A collection of programmable and non-programmable calculators | Pocket calculators, Calculator, Computer history](https://i.pinimg.com/736x/f4/59/f2/f459f290ab8a9f3997e23e0ca451972c.jpg)