Terminated: unknown
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 validated 2024-01-23): they had a spare key due to the layout
and needed a new one-button function to fill the gap?
where the input, x, is the amplitude gain (Y / Yref)
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 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.