HP -11C Owner's Handbook Manual page 12

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:
Turn the HP-11C off.
Press and hold the [ON] key. ON
Press and hold the E)key. :
Release the key and Resetting
then release the ()key. Continuous Memory
Es Se BO ES
When you perform the memory reset
operation the error message shown to Pre
. H . ror
the right is displayed. Press [#] (or
any other key) to clear the message.
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.
~we~
Section 1: Getting Started 21
© To select the alternate function
printed in gold above the key,
first press the gold prefix key [1),
then press the function key; for
example: [f)[z}.
¢ To select the primary function
on the face of the key, press only
that key; for example: (CHS).
¢ To select the alternate function
printed in blue on the slanted
face of the key, first press the
blue prefix key [9], then press
the function key; for example:
9 }[ABS}.
Notice that when you press the [f] or
(@] prefix keys, the f or g annunciator
appears and remains in the display
until a function key is pressed to
complete the sequence.
0.0000
Clearing Prefixes
One-Number Functions
A one-number function is any numerical function that performs an
operation using only one number. To use any one-number function:
1. Key inthe number (if it is not already in the display).
2. Press the function key(s).
Keystrokes Display
45 45
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