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HP HP-25 User Manual
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Displaying
a
Particular
Step
If
you
want
to
see
one
of
the
latersteps
of
your
program,
B3
is
not
convenient.
To
display
a
particular
step
of
program
memory
use
the
key
with
the
PRGM-RUN
switch
set
to
RUN
ercw
[l
~ox
.
Simply
press
and
then
key
in
the
desired
two-
digit
step
number.
Then
set
the
PRGM-RUN
switch
to
PRGM
ercv
[[[H@~~
and
the
contents
of
the
specified
step
will
be
displayed.
For
example,
to
see
step
10
in
the
previous
program,
set
the
PRGM-RUN
switch
to
RUN
esev
Jll[TM
»»~»
and
press
(1][o].
Then
switch
back
to
PRGM
mode
rov
[[[[HlMl~~.
The
display
will
show:
10
06
When
using
the
[
key
in
this
way,always
use
two
digits
for
designating
step
numbers.
For
instance,
to
see
step
6
you
must
press
[o][6]in
RUN
mode
and
thenswitch
back
to
PRGM
mode.
If
the
first
digit
key
following
[
is
greater
than
four,
the
[E8)
key
is
ignored
and
the
number
is
keyed
into
the
X-register.
Similarly,if
one
of
the
two
keys
following
[
is
not
a
digit
key,
the
@@
key
is
ignored
and
the
operation
associated
with
the
invalid
key
is
performed.
Interrupting
Program
Execution
From
time
to
time
you
will
want
a
program
to
stop
execution
by
itself
so
that
you
can
enter
new
data
or
view
an
intermediate
result.
There
are
two
operations
on
your
HP-25
calculator
that
will
automatically
interrupt
program
execution
when
they
are
encountered
as
program
instructions:
[Ris]and
{7
[Pause
.
85
87
Table of Contents
Table of Contents
4
Function Key Index
7
The HP-25 Programmable Scientific Calculator
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 Aboutthe 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
39
The Stack
39
Initial Display
39
Manipulating Stack Contents
39
Clearing the Stack
41
The KBY Oo
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
54
Prefix Clear
54
Number Alteration Keys
55
Reciprocals
56
Square ROOS
56
SQUANING " O
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 Isa 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 X
115
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HP HP-25 Specifications
General
Brand
HP
Model
HP-25
Category
Calculator
Language
English
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