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HP 9G Calculator - Using Memory

The memory in the HP 9G calculator can be used to store variables, equations, and array variables.
Using the running memory
The running memory is an accumulative memory location. Operations that can be performed using the running memory are shown in the following table:
Operation
Result
Press M+.
Adds the current result to the running memory.
Press 2nd, then M-.
Subtracts the value from the running memory.
Press MRC.
Recalls the value in running memory.
Press MRC twice.
Clears the value in running memory.
See Figure 1 for an example of using the running memory.
Figure : Using the running memory
Working with standard memory variables
The calculator has 26 standard memory variables: A, B, C, D, …, Z. Each of these can have a value assigned to them.
Operations that can be performed using variables are shown in the following table:
Operation
Result
SAVE, Variable, ENTER
Assigns the current answer to the specified variable (A, B, C, … or Z)
2nd RCL
Displays a menu of variables (select a variable to recall its value).
ALPHA Variable, ENTER
Recalls the value assigned to the specified variable.
2nd, CL-VAR
Clears all variables.
The same value can be assigned to more than one variable in the same step. For example, to assign 98 to variables A, B, C, and D perform the following keystrokes:
9, 8, SAVE, A, ALPHA, ~, ALPHA, and then D.
Storing an equation
The current equation can be stored in memory:
  • Press SAVE, then PROG to store the current equation.
  • Press PROG to recall the equation.
Using array variables
The memory in the calculator can be expanded to a maximum of 59 memories. By using the array variables, you can convert up to 12 program steps to one memory location. A maximum of 33 memories can be added this way.
Expanded variables are named A[1], A[2] etc and are used in the same way as standard variables.
Operations that can be performed using array variables are shown in the following table:
Operation
Result
  1. Press MATH four times.
  2. Press the Down Arrow to select Defm.
  3. Press ENTER.
  4. Key in the number of locations to add.
  5. Press ENTER.
Expands the number of memories.
The display shows the number of memory locations, and the remaining bytes.
  1. Key in a number to be stored.
  2. Press SAVE.
  3. Specify a memory location (for example, A, ALPHA, [ ], 27).
  4. Press ENTER.
Saves a value to a memory location (A[27] in the example).
  1. Specify a memory location (for example, A, ALPHA, [ ], 27).
Recalls the value assigned to the specified memory location (A[27] in the example).
  1. Press MATH four times.
  2. Press the down arrow to select Defm.
  3. Press ENTER.
  4. Key in the number 0 (zero).
  5. Press ENTER.
Returns memory to the default configuration.
  note:
When using array variables, be careful to avoid overlap of memories. The relationship between memories is shown in Figure 2.
Figure : Relationship between memories

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