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HP 25 User Manual
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82
Programming
Displaying
a
Particular
Step
If
you
want
to
see
one
of
the
later
steps
of
your
program,.
is
not
convenient.
To
display
a
particul
a
r
step
of
program
memory
use
the
mm
key
with
the
PRGM-RUN
switch
set
to
RUN
PRGM"
RUN
.
Simply
press
mm
and
then
key
in
the
desired
two-
digit
step
number.
Then
set
the
PRGM-RUN
switch
to
PRGM
PRGM~RU
N
and
the
contents
of
the
specified
step
will
be
displayed.
For
example
,
to
see
step
lOin
the
previous
program,
s
et
the
PRGM-RUN
switch
to
RUN
PRGM"
R
UN
and
press
mm
[]]
@].
Then
switch
back
to
PRGM
mode
PRGM~RUN.
The
display
will
show:
I
10
06
When
using
the
mmkey
in
this
way
,
always
use
two
digits
for
designating
step
numbers.
For
instance
,
to
see
step
6
you
must
press
mm
@]
~
in
RUN
mode
and
then
switch
back
to
PRGM
mode
.
If
the
first
digit
key
following
mmis
greater
than
four
,
themIil
key
is
ignored
and
the
number
is
keyed
into
the
X-register.
Similarly,
if
one
of
the
two
keys
followingmm
is
not
a
digit
key
,
the
mmkey
is
ig
nored
and
the
operation
associated
with
th
e
invalid
key
is
performed
.
Interrupting
Program
Execution
From
time
to
time
you
will
want
a
program
to
s
top
execution
by
it
s
elf
so
that
you
can
enter
new
dat
a
or
view
an
intermediate
result.
There
are
two
operations
on
your
H
P-25
calculator
that
will
automatically
interrupt
progr
a
m
e
xe
cution
when
they
a
re
encountered
as
program
in
s
truction
s
:
~
and
D
1
PAUS
E
I.
85
87
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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