Settings

RPN : 

                                   RPN is short for Reverse Polish Notation.

In RPN mode, numbers are entered first, separated by pressing [Enter], followed by an operation key.

Note: press [Enter] key to enter an operand and operator. Each time you press an operation or function key, the answer is calculated immediately and displayed.

For example, suppose you wanted to add two numbers in RPN. 1 and 2. Press [1] [Enter] [2] [Enter][+].