Key Presses And The Secondary Function : Key; Annunciators - HP 20B User Manual

Key Presses and the Secondary Function : Key

To execute the function associated with a key, press and release the desired key. Most of the 20b's keys have two functions:
the primary function and the secondary function. The primary function is printed on the top of the key. The secondary function
is printed on the bevel of the key. See Figure 2.
To activate the secondary function of a key, press and release
printed on the bevel. Unlike the shift key on a typewriter or computer keyboard, it is not necessary to press and hold
while pressing another key.
:
When is active, the down arrow annunciator appears on screen, indicating that the next key pressed will execute the
secondary function of the key. To cancel an accidental press of
In this manual, commands using the secondary key functions are represented by the secondary function key symbol,
followed by the key with the secondary function. For example, to execute sine , press
the key is highlighted, while the 7 is grayed out. This highlighting focuses on the function of the key that will be activated in a
given command, and it is used throughout the manual to make the examples easier to follow. Key commands for example
problems are provided throughout the text and in tables. Key symbols are placed in the order they are to be pressed, from left
to right.

Annunciators

Annunciators are symbols that appear in the display as messages, or after certain keys or key combinations have been
pressed. Annunciators are special symbols indicating a specific status in the calculator. Figure 3 illustrates the annunciator
symbols in the display.
R
Secondary
(shifted) Function
Figure 2 Primary and Secondary Key Functions
:
:
11
Primary
Function
followed by the key with the desired secondary function
:
, simply press
:p
Basic Features
a second time.
. Note how the SIN portion of
:
:
,