Resetting Memory; Keyboard Operation; Primary And Alternate Functions - HP -11C Owner's Handbook Manual

20 Section 1: Getting Started
When the HP-11C is turned on, it always "wakes up" in Run mode
(PRGM annunciator cleared), even if it was in Program mode
(PRGM annunciator displayed) when last turned off.
Continuous Memory is preserved for a short time when the
batteries are removed, allowing you to replace a set of low batteries
without losing any data or programs you want preserved in the
calculator.
Resetting Memory
If at any time you want to reset (entirely clear) the HP-11C's
Continuous Memory, do the following:
1. Turn the HP-11C off.
2. Press and hold the key.
3. Press and hold the [-]key.
4. Release the key and Resetting
then release the [-]key. Continuous Memory
When you perform the memory reset
operation the error message shown to
the right is displayed. Press (or
any other key) to clear the message.
Pr Error
Note: Continuous Memory can be inadvertently reset if the
calculator is dropped or otherwise traumatized, or if power is
interrupted.
Keyboard Operation
Primary and Alternate Functions
Most keys on your HP-11C perform one primary and two alternate
functions. The primary function of any key is indicated by the
character on the horizontal face of the key. The two alternate
functions are indicated by the characters above and on the slanted
face of the key.