Contents
The
HP-21
Scientific
Pocket
Calculator
.............
4
Display
.
...
4
HP-21
Functions
and
Keyboard
Index
.................
5
Getting
Started
.........
...
..
7
Introduction
.......
... ...
.
7
Power
ONn
...
7
CLX
KeY
ottt
e
8
Keying
In
Numbers
........
...
... ...
...
..
.
.
i,
8
Keying
In
Negative
Numbers
..........................
8
Operations
.............
.
9
One-Number
Functions
............
... ...
...
......
9
Two-Number
Functions
.
..........................
10
Chain
Calculations
.........
... ...
.
..
12
A
Word
about
the
HP-21
.
...
...
...
.. .. ..
...
..
..
....
15
Controlling
The
Display
...........
..
...
...........
17
Display
Key
.
...
17
Fixed
Decimal
Point
Display
..........................
18
Scientific
Display
..........
...
..
.
..
19
Automatic
Display
Switching
..........................
20
Keying
In
Exponentsof
Ten
..........................
21
EEX
and
y*
...
..
23
Overextended
Calculation
............................
24
How
the
HP-21
Works
...
.
25
The
Stack
...
25
Initial
Display
..........
.
25
Reviewing
the
stack
.................................
26
Clearing
...
...
29
Arithmetic—How
the
Stack
Does
It
...................
29
Chain
Arithmetic
.........
...
..
. .
.
31
Direction
of
Execution
...........
...
.
...
..
...
.
... ...
34
Constant
Arithmetic
........
...
...
.
...
.
...
.
..
36
Exchangingxandy
...........
...
i,
37
Error
Display
...
38
Shift
Key
Cancel
..........
...
..
...
.
..
38
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