In order to perform operations in RPN mode, the object or objects must be placed on the stack. Entries on the stack are numbered and each entry on the stack has an associated level (the number of the line on which the entry appears). This document discusses placing, entering, and retrieving objects on the stack. This document also gives examples of stack calculations.
note:To use the stack, the calculator must be in RPN mode. To activate the RPN mode, press MODE to access the CALCULATOR MODES input form, and set the mode option to RPN.