HP 25 User Manual

Getting Started 15
Clearing
You can clear any numbers that are in the display by pressing
ram (clear x). This key erases the number in the display and
replaces it with 0 .
Press Display
_ 10.00 ~
If you m ake a mistake while keying in a number , clear the entire
number string by pressing
ED. Then key in the correct number.
Functions
In spite of the dozens of functions available on the HP-25 key-
board, you will find
the calculator simple to operate by using a
single, all-encompassing rule: When you press a
function key,
the calculator
immediatel y exec utes the f unction written on
that key.
Pressing a function key causes the ca lculator to im-
mealalelY
perrorm mal runcllon .
For example, to calculate the square root of 148.84 merely:
Press
148.84
a
~
Display
1 148.84
1 148.84
112.20
To squa re the result:
Press Display
iii 1 12.20
[ZJ 1 ~ 1 ~ 48 ~ .8 ~ 4 = =i
~ and [ZJ are examples of one-number function keys; that is,
keys
that execute upon asin gle number. A ll function keys in the
HP-25 operate upon either one numb er or two numbers at a time
(except for statistics
keys like BJ and 0 -more about th ese
later).
Function keys operate upon either one number or
two numbers.

HP 25 Specifications

General

Power Source	Rechargeable battery pack
Programming Steps	49
Release Year	1975
Functions	Trigonometric, logarithmic, statistical
Type	Scientific
Dimensions	148 x 80 x 14 mm