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HP 30S Calculator - System and User Memory

Introduction
This document discusses the system and user memory for the HP 30s calculator.
Calculator symbol key
The procedures in this document use the following text to represent symbol keys:
Key
Description
Text Representation
Move cursor left
cursor-left
Move cursor right
cursor-right
Move cursor up
cursor-up
Move cursor down
cursor-down
System memory
There are four types of data that can be stored in the system memory: previous entries, last answer, linear solutions, and quadratic solutions.
Previous entries
The HP 30s keeps a record of all the entries that have been made (up to a maximum of 320 characters). These entries are saved even after the calculator has been turned off. To scroll through the list of entries, press the cursor-up or cursor-down keys. Previous entries that have been stored in the calculator's system memory can be re-used or edited when it is on the entry line.
Last answer
To retrieve the last answer:
  1. Press 2ND, then ANS (ANS appears on the entry line)
  2. Press ENTER to see the value of the last answer.
Using the last answer
  1. Press the operator key (+, -, /, etc.). ANS will appear on the entry line followed by the operator.
  2. Complete the entry as normal.
Linear solutions
The results of solving a set of linear equations are stored in the variables x and y.
Quadratic solutions
The results of solving a quadratic equation are stored in the variables x1 and x2 or y1and y2.
User memory
User memory contains three parts: memory variables, constant expressions, and running memory.
Memory variables
There are five memory variables: A, B, C, D, and EQN. Real numbers can be stored in variables A-D, and expressions can be stored in EQN. Real numbers can also be stored in x, y, x1, x2, y1, and y2; however, the values in these variables are replaced with linear equations and quadratic solutions.
Storing numbers or expressions
  1. Enter the variable, then press STO
  2. Select the variable from the variables menu.
  3. Press ENTER
Constant expression [K]
A constant expression is any combination of operators, functions, variables and numbers that can be added to the end of an entry and be evaluated. A constant expression is useful when applying the same operation to different inputs.
Defining or modifying constant expressions
  1. Press 2ND, then K
  2. Enter the needed operators, functions, and numbers.
  3. Press ENTER
Using a constant expression
  1. Make sure the K indicator is displayed.
  2. If the K indicator is not displayed, press 2ND, K, then ENTER. The constant expression will be attached to the input and the result will be evaluated. For example, if the constant expression is "+ sin (30)", entering 2 and pressing ENTER yields 2.5, that is, 2+sin (30).
Returning to normal operation
To return to normal operation, press 2ND, then K.
 note:
After returning to normal operation, the constant expression will be retained for later use.
Using the running memory
  1. To add a result to the running memory, press M+
  2. To subtract a value on the result line from the running memory, press M-
  3. To recall a value in the running memory, press MRC
  4. To clear the running memory, press MRC twice.

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