CASIO fx-110


Brand: CASIO
Model: fx-110
Type: Scientific calculator
Picture: CASIO fx-110
Batteries: AA x 2
Lifetime: Introduced: 1977
Terminated: unknown
Notes: A CASIO scientific calculator with a fluorescent display, a slider to switch between modes, and capable of calculating with fractions and statistical operations. It has a 10-digit precision.

Next to all the familiar scientific functions, this calculator has an unusual key, the "dB"-key. According to its manual this key performs decibel conversions using the formula:
ydB = 20 · log10 (x)

where the input, x, is the amplitude gain (Y / Yref)
Maybe it is as Voidware describes on this page (link valid 2024-01-23): they had a spare key due to the layout and needed a new one-button function to fill the gap?

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.

This particular one is quite worn out but still working fine. Must have been used quite heavily.

Many thanks to Richard Pilkington of the University of Salford for donating this calculator to the museum.


A power adapter.