This is a peculiar calculator. It has a special key, the "P"-key which function is determined using a slider. This slider has the following positions:
- √ - Square roots. The "P"-key will
calculate the square root of a gven number.
- GT - Memory calculation. The "P"-key will
display the "Grand Total" of all calculations so far. Every time
the "="-key is pressed after the last time the
"AC"-key was pressed, the result is added to this "Grand
Total". The "Grand Total" memory works independent from the
calculators regular memory.
- rem - Remainder This setting will change the operation
of divisions. Divisions are performed as with integer results, and
the "P"-key will show the remainder. Thus, when performing
6 / 4, the result will be 1, and the "P"-key will yield 2.
- ab/c - Fractional calculation.
This will change the "P"-key into the "fraction" key
present on many Casio calculators, and will let the calculator
operate on fractions.
- hms - Time calculation. This will change the
"P"-key into the "hours minutes seconds" key present on
many Casio calculators.
- SD - Standard deviation. This will change some keys on
the calculator. The "="-key will act as a Σ+
operator. The memory keys will perform the statistical functions
displayed above them. The normal memory functions are unavailable
in this mode. The "P"-key will calculate the standard
All in all, a very unusual design.
Even though this calculator has some sophisticated scientific
functions it has a quite common bug in that this calculator has no
problems with negative square roots and thinks √-9 = -3.