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HP 25 User Manual
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The
HP-25
Means
Painless
Programming
Your
HP-25
is
a
versatile,
handheld
electronic
calculator
that
uses
the
powerful
Hewlett-P
a
ckard
logic
system
to
compute
answers
to
complex
mathematical
problems
in
either
of
two
modes
:
•
Manual
problem
solving.
You
work
step-by-step
through
the
toughest
of
problems
,
choosing
from
among
the
dozen
s
of
functions
available
to
calculate
the
correct
a
nswer
quickly
and
easily.
•
Programmed
problem
solving.
The
H
P-25
memorizes
a
sequence
of
up
to
49
different
functions
as
you
press
them
,
and
then
repeats
that
sequence
automatically
as
often
as
you
wish
to
solve
a
particular
type
of
problem.
That's
all
there
is
to
it!
A
pr
ogra
m
is
nothing
more
than
a
se-
quence
of
manual
keystrokes
that
is
remembered
by
the
calcu-
lator.
You
can
then
execu
te
the
progr
a
m
as
often
as
you
like.
No
prior
computer
pro
g
rammin
g
experience
is
necessary
for
H
P-25
ca
lc
ulator
pro
g
rammin
g.
To
see
the
close
relationship
between
the
manual
so
lution
to
a
problem
a
nd
a
programmed
solution
,
let's
solve
a
problem
manually,
and
then
use
a
program
to
solve
the
same
problem
and
others
like
it.
Manual
Problem
Solving
To
calculate
the
surface
area
of
a
sphere,
the
formula
A
=
7r
d
2
can
be
used,
where:
A
is
the
surface
area
,
7r
is
the
value
of
pi
,
3.1415
...
,
and
d
is
the
diameter
of
the
sphere.
Ganymede
,
one
of
Jupiter
'
s
12
moons
,
has
a
diameter
of
3200
miles.
To
use
the
H
P-25
to
m
a
nually
compute
the
area
of
Ganymede
,
you
can
press
the
following
keys
in
order:
First,
slide
the
calculator
OFF"ON
switch
to
ON,
and
slide
the
PRGM"
RUN
switch
to
RUN.
Then
press
Display
bB!33
~b
H
1
3200
.
II
=
~
--
!±}
1
1
02400
00.00
1
9
Di
a
meter
of
Ganymede
.
Square
of
the
diameter.
12
14
Table of Contents
Table of Contents
4
The HP-25 Programmable Scientific Calculator
9
Function Key Index
9
Memory
10
Programming Key Index
10
The HP-25 Means Painless Programming
13
Manual Problem Solving
13
Programmed Problem Solving
14
Section 1: Getting Started
17
Display
17
Keyboard
17
Keying in Numbers
18
Negative Numbers
18
Clearing
19
Functions
19
Chain Calculations
22
A Word about the HP-25
26
Section 2: Controlling the Display
29
Display Control Keys
29
Automatic Display Switching
34
Keying in Exponents of Ten
35
Calculator Overflow
37
Error Display
37
Section 3: the Automatic Memory Stack the Stack
39
Initial Display
39
Manipulating Stack Contents
39
The
39
Clearing the Stack MMM Key
42
One-Number Functions and the Stack
44
Two-Number Functions and the Stack
44
Chain Arithmetic
46
Order of Execution
49
Constant Arithmetic
50
Section 4: Function Keys
53
Last X
53
Prefix Clear
54
Number Alteration Keys
55
Reciprocals
56
Square Roots
56
Squaring
57
Using Pi
57
Percentages
58
Storage Registers
59
Trigonometric Functions
63
Polar/Rectangular Coordinate Conversion
66
Logarithmic and Exponential Functions
67
Statistical Functions
70
Vector Summations
74
Section 5: Programming
77
What Is a Program
77
Why Write Programs
77
Three Modes of Operation
78
Introductory Program
79
Running a Program
82
Gto 00
82
Writing a Second Program
83
Interrupting Program Execution
86
Branching
91
Editing a Program
95
Program Applications
101
Afterword
103
Appendix A: Accessories, Service , and Maintenance
105
Standard Accessories
105
Optional Accessories
105
AC Line Operation
105
Battery Charging
106
Battery Operation
107
Battery Pack Replacement
108
Service
109
Temperature Range
110
Warranty
110
Appendix B: Improper Operations
113
Appendix C: Stack Lift and LAST
115
Index
117
4
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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
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