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Power On and Off
The = key turns the HP-15C on and off.
calculator automatically turns itself off after a few minutes of inactivity.
Keyboard Operation
Primary and Alternate Functions
Most keys on your HP-15C perform one primary and two alternate, shifted
functions. The primary function of any key is indicated by the character(s)
on the face of the key. The alternate functions are indicated by the gold
characters printed above the key and the blue characters printed on the
lower face of the key.
To select the primary function printed on
the face of a key, press only that key. For
example: ÷.
To select the alternate function printed in
gold or blue, press the like-colored prefix
key (´ or |) followed by the function
key. For example: ´ _; |
£.
Throughout this handbook, we will observe certain conventions in referring
to alternate functions. References to the function itself will appear as just the
key name in a box, such as ―the W function.‖ References to the use of
the key will include the prefix key, such as ―press | W.‖ References
to the four gold functions printed under the bracket labeled ―CLEAR‖ will
be preceded by the word ―CLEAR‖, such as "the CLEAR Q function,‖
or ―press ´ CLEAR M.‖
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Note that the = key is lower than the other keys to help prevent its being pressed inadvertently.
Section 1
Getting Started
18
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To conserve power, the
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