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This calculator is quite powerful. It has a two-line display, an alphanumeric part where expressions are entered, and a numeric part of 10+2 digits for the results. Expressions can be edited and "replayed". The calculator has statistical functions and can perform calculations in different base systems.
Integrals can be calculated numerically using the ∫dx function. First specify a function using "X" as a variable, then the start and end of the required interval. Use this, for instance, on the function "sin (X)" in the range from 0 to π to obtain the correct result of 2.
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 calculator has a two-line display, one that shows the formula entered, and the other which shows the results. To perform operations on a previous result, the Ans key has to be used. This method is rather cumbersome in some cases. Especially when you’re used to "normal" scientific calculators where, to calculate the root of a result one simply taps the appropriate key. On this calculator, one has to type √ Ans EXE. CASIO has perfected the two-line calculation method later on with the CASIO fx-82TL and later models.
What I don’t like are the dark display and its three shift modes.
A very nice feature is a storage compartment for a spare battery. Inside the case there’s room to put a spare battery. Are there any other calculators with this feature?
Overall, nice, useful and conveniently small.