HP 12C#ABA HP 12c Financial Calculator Quick Start Guide - Page 11

Storage Registers and Continuous Memory Numbers (data) are stored in memories called "registers." Special registers are used for storing numbers during calculations, the "stack" registers, and the "Last X" register, which is used for storing the last number in the display before operations are performed in RPN mode. Numbers are stored automatically in these registers. There are also registers in which you can manually store data, designated R0 through R9 , R.0 through R.9 , and financial registers used for financial calculations. All these storage registers make up the calculator's Continuous memory. All information in the Continuous memory is preserved even while the calculator is turned off. To reset the memory and clear all of the registers and return the calculator's settings to their defaults, turn the calculator off, and while holding down Z, press S. With "Pr Error" dis- played, press any key to return to the default calculator screen. Reverse Polish Notation (RPN) Mode The following information is a brief overview of how RPN works. For more detailed information about RPN and how the stack works, refer to the HP 12c Financial Calculator User's Guide. In RPN mode, numbers are entered first, separated by pressing R, followed by an operation key. Pressing R is optional after entering a number, if the next key pressed is an operation. Each time you press an operation or function key in RPN, the answer is calculated immediately and displayed. For example, suppose you wanted to add two numbers in RPN, 1 and 2. Press 1R2;. Getting Started 7