CASIO fx‑39


Brand: CASIO
Model: fx-39
Type: Scientific calculator
Picture: CASIO fx-39
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 fractions and 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.


A power adapter.