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HP 25 User Manual
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The
Automatic
Memory
Stack
4
7
Example:
A
bacteriologist
tests
a
certain
strain
whose
popu-
lation
typically
increases
by
15
%
each
day.
lfhe
starts
a
sample
culture
of
1000,
what
will
be
the
bacteria
population
at
the
end
of
each
day
for
six
consecutive
days?
Method:
Put
the
growth
factor
(1.15)
in
the
Y-
,
Z-
,
and
T-
registers
and
put
the
original
population
(1000)
in
the
X-register.
Thereafter,
you
get
the
new
population
whenever
you
press
0.
Press
Display
1.15
1
1
.
1
5
Growth
factor.
Imim
1
1.15
Imim
1
1.15
Imim
1
1
.
15
Growth
factor
now
in
T.
1000
1
1000.
Starting
population.
0
1
1150.00
Population
after
I
st
day.
0
1
1322.50
Population
after
2nd
day.
0
1
1520.88
Population
after
3rd
day.
0
1
174
9.01
Population
after
4th
day.
0
1
2011.36
Population
after
5th
day.
0
1
2313
.
06
Population
after
6th
day.
When
you
press0the
first
time,
you
calculate
1.15
x
1000.
The
result
(1150
.
00)
is
displayed
in
the
X-register
and
a
new
copy
of
the
growth
factor
drops
into
the
Y
-register.
Since
a
new
copy
of
the
growth
factor
is
duplicated
from
the
T-register
each
time
the
stack
drops
,
you
never
have
to
reenter
it.
Notice
that
performing
a
two-number
operation
such
as
0
causes
the
number
in
the
T-register
to
be
duplicated
each
time
the
stack
is
dropped.
However
,
the
mJ
key
,
since
it
rotates
the
contents
of
the
stack
registers
,
does
not
rCll'ritc
any
number
,
but
merely
shifts
the
numbers
that
are
already
in
the
stack.
50
52
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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