Casio - fx-31


Brand: Casio
Model: fx-31
Type: Scientific calculator
Batteries: AA x 2
Lifetime: Introduced: ca. 1976
Terminated: unknown
Notes: This Casio scientific calculator has a fluorescent display, and a slider to switch between modes. The display has no marker to indicate that a number is stored in the calculator's memory so it's up to the user to remember this. Other than that, the display does show minute/second marks.

This calculator (as do many other Casio scientific calculators) uses one and the same key for both the constant π as well as exponents. This works as follows. When you first enter digits, the "EXP"-key will enable you to enter the numbers exponent, otherwise it will enter the constant π.

Thank you, Joop Berck, for donating this calculator to the museum.

Picture:  Casio fx-31 picture


A power adapter.

©2009 Ernst Mulder