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HP 25 User Manual
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80
Programming
volume
of
a
spherical
balloon
as
its
diameter
increases
using
the
formula:
Increase
in
volume
=
1167T
(d
1
3
-
d
o
3
)
,
where
d
o
is
the
original
diameter
of
the
balloon
and
d,
is
the
new
diameter
.
If
do
were
entered
in
the
Y
-register
and
d
,
were
keyed
into
the
X-register
,
the
problem
could
be
solved
manually
by
pressing
the
keys
shown
in
the
left-hand
column
that
follows.
Keys
Display
m;:zm
01
31
[]]
02
03
O
w
03
14
03
Cube
the
new
diameter
.
EiD
04
21
[]]
05
03
0
06
14
03
Cube
the
original
diameter.
B
07
41
Subtract
the
cubes
.
m
El
08
15
73
0
09
61
Multiply
by
7T.
~
10
06
G
11
71
I
Divide
by
6.
The
progr
a
m
keystrokes
for
this
problem
are
the
same.
Simply
switch
to
PRGM
mode
PRGM
~RUN
and
press
[§§C
]
to
clear
program
memory
and
display
step
00.
Then
key
in
the
list
of
keys
above.
The
keys
are
not
executed,
but
are
recorded
in
program
memory
s
teps
01
through
II.
Verify
th
a
t
each
key-
code
is
correct
as
you
key
in
each
instru
c
tion
b
y
checking
the
display
s
s
hown.
(Notice
th
a
t
you
had
to
record
the
m;:zm
key
as
a
n
instruction
in
this
pro
g
r
a
m
.
TheBmm
instruction
here
se
par
a
te
s
the
num-
ber
3
th
a
t
is
the
second
step
of
the
pro
g
r
a
m
from
the
digit
s
for
the
new
diameter
th
a
t
you
will
key
in
l
ater.)
83
85
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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