Tektronix 909 User manual

INSTRUCTION
MANUAL
Tektronix , Inc.
070-1227-01
P.O. Box 500
909/911
PROGRAMMABLE
CALCULATOR
OPERATORS
Serial Number
Beaverton ,
Oregon 97005
Phone : [phone]
Cables
:
Tektronix
372

WARRANTY
All TEKTRONIX instruments
are
warranted
against
defective materials and workmanship for one year . Any
questions with
respect
to the
warranty
should be taken
up
with your TEKTRONIX Field Engineer or representative .
All
requests
for
repairs and
replacement parts
should
be
directed to the TEKTRONIX Field Office or representative
in
your area
. This will
assure
you
the
fastest possible
service . Please include the instrument Type Number or Part
Number and Serial Number with all requests for parts or
service .
Specifications
and price
change
privileges
reserved .
Copyright © 1972 by Tektronix , Inc. , Beaverton , Oregon .
Printed in the United States of America . All rights reserved .
Contents of this publication may not be reproduced in any
form without permission of Tektronix , Inc.
U.S.A. and foreign TEKTRONIX products covered by U.S.
and foreign patents and / or patents pending .
TEKTRONIX is a registered trademark of Tektronix , Inc.
I

SECTION 1
KEYBOARD OPERATION
Introduction
Programming and
Decision
- Making
Peripheral Equipment
Manual
Organization
Preparation for Calculator
Operation
SECTION
2
TABLE
OF
CONTENTS
KEY
OPERATION
KEYS FOUND ONLY ON THE
STATISTICIAN 911
CONVERSION OF 911
SPECIAL
KEYS TO 909 EQUIVALENTS
FUNCTIONAL
KEYBOARD
DESCRIPTION
Data
Entry Keys
Single
-
Variable
Operation Keys
Two
-
Variable
Operation
Keys
Flashing
Display
Loss
of
Storage
PROGRAMMING
Introduction
Storage
Registers and
Program
Steps
Programmable Keys
Sequence of Program Entry
Correcting Programming Errors
Preserving
a
Program
Flashing
Display
in
Programming
Simple
Functions
Designating an Equality for x
Varying
Parameters in
f ( x )
Several Functions Within f ( x )
Functions of Functions
Nesting
Functions
Repeating a
Program
with
Changed
Values
Indirect
Addressing
Functions Involving More than
One
Result
Decision
-
Making
Practical
Applications of
Calculator
Programs
Statistical
Applications
Page
1-1
1-1
1-2
1-2
1-2
1-3
1-14
1-15
1-17
1-17
1-19
1-20
1-21
1-21
2-1
2-1
2-1
2-2
2-2
2-3
2-4
2-4
2-4
2-6
2-7
2-8
2-9
2-11
2-12
2-13
2-15
2-22
2-25
SECTION 2
PROGRAMMING ( cont )
THE
TEKTRONIX
f ( x )
REPEATER
920
Example of
Operation
TEKTRONIX
Programmer
926
SECTION 3 THE
PROGRAM
LIBRARY
Introduction
The
Library
THE
PROGRAM
FORM
Page
1 -
Problem
Description
Page 2 -
Examples
Key
Code Symbols
Statistician
911
Keys
Page
3 -
Program Execution
Page
4 -
Program
Steps
Program
Worksheet
909/911
APPENDIX
B
ABRIDGED
OPERATING
INSTRUC
TIONS FOR THE
TEKTRONIX
SCIENTIST 909
Abbreviations
for
Key
Symbols
Function
Keys
Data
Entry
Data Storage and Recall
APPENDIX A
CALCULATOR
SPECIFICATION
Table 1 -
Electrical
and
Physical
Characteristics
A - 1
Table 2 - Operating Characteristics
A
- 2
Permissible
Combination
of
Operations ( Words and Sentences )
Programming
Use of CLEAR
APPENDIXC LOGIC OF CALCULATIONS OF
THE
TEKTRONIX
CALCULATOR
Logic
Functions
Equations as Logic Functions
Logic Functions on the Calculator
Page
2-26
2-28
2-29
3-1
3-1
3-3
3-3
3-3
3-4
3-9
3-9
3-10
3-10
B - 1
B - 1
B - 3
B
- 4
B
- 5
B - 6
B - 6
C - 1
C
- 2
C
- 4

909/911
+
3141592653x10
+57
REMOTE
SLEAR
int x
log x
DEFINE
• fox
√x² +
DISPLAY
(
Inx
*
PEKTRONIX
Scientist
908
*
10 **
TT
Fig
. 1-1 . The
TEKTRONIX
Scientist 909
Calculator .
RAD
hyper
arc
tan
x
COS
X
sin x
A

Introduction
KEYBOARD OPERATION
Section
1-909 /
911
Ever since man's ability to count progressed beyond the total number of his fingers and
toes , operations with numbers have been difficult and cumbersome . Addition , subtraction ,
multiplication and division of large whole numbers , fractions and complex numbers have
required tedious calculations , with the possibility of error at every step . Raising numbers to
exponential powers , finding roots of numbers , and determining reciprocals are all
complicated and time - consuming by standard methods . Slide rules provide a quick way of
finding answers accurate to two or three places - and computers are an expensive means of
solution , not available to everyone . Now , scientific calculators such as the TEKTRONIX
Scientist
909
and
Statistician 911 give
instant results
to 10 - place
accuracy
for
all of the
above calculations , and by the use of programmable features of the calculators , yield precise
answers to many
more
problems that are
even more
difficult . All of
these
features are
provided at costs far below those of even the small computers now available .
TEKTRONIX calculators are virtually alone in the field in their use of standard
mathematical language in performing all operations . All operations within the capacity of
the calculator can be performed by the use of the keyboard alone , and the function of each
key is indicated in conventional mathematical terms on the key face . Any operator with
basic knowledge of mathematical language and functions can perform calculations of
considerable complexity with no other instruction than a few minutes at the keyboard of
the 909 or 911 .
Programming and Decision - Making
Where a problem is to be used many times with changes only in the values of the variable ,
the programming capability of the Scientist or Statistician is extremely useful . Large
amounts of data can be entered , and results retrieved quickly , by the use of the 26 storage
registers ( 100 optional ) and 256 individual programming steps offered . Because of their
1-1

Keyboard
Operation -
909
/
911
unique
ability
to
make ,
and
act
upon ,
logic
decisions ,
TEKTRONIX
calculators
are
able
to
perform
many
mathematical
functions
normally
expected
only of
computers
. Section
2
gives a
detailed
description of
this feature
,
and
Appendix C
discusses it
even
further
.
1-2
Peripheral Equipment
Several items
of peripheral
and related
equipment are
available to
expand
the
operating
range of
TEKTRONIX
calculators
. The
Programmer
926
provides for
greatly
diversified
and
enlarged
programmed
operation
.
Other
important
peripherals
include
the Printer
941
,
X - Y
Plotter
915 , and
Teletype
Interface
944.
Complete
information
on
interface
connections
will
be
found in
the
Calculator
Interfacing
Manual ,
TEKTRONIX
Part No.
070-1280-00 .
Manual
Organization
Three
sections of text
and three
major
appendices are
included in this
Operators
' Manual
.
Section 1
describes initial
power
connection , and gives
complete
information
on keyboard
operation .
The
keyboard
description
includes
first a key
- by - key
physical
layout with
examples of
key function
where
applicable , then a
functional
description by
major
groups
of
keys .
Finally ,
Section 1
incorporates
a description
of the
special keys
found on the
Statistician 911
, and
instructions for
duplicating 909 key
functions not
found on the
911
keyboard .
Section 2
is concerned
with
programming
, and with
a discussion
of the
logic
decisions
which can be
made and
acted upon
by TEKTRONIX
calculators .
Section 3
shows
examples of TEKTRONIX calculator programs , and describes use of the Program Library
and the Program Worksheet forms . Appendix A describes the calculator specifications ;
Appendix B contains abridged operating instructions for the experienced calculator user ;
and
Appendix
C is a more
detailed
description of
calculator logic .
PREPARATION FOR CALCULATOR OPERATION
Your TEKTRONIX Calculator has been shipped from the factory wired for operation at a
specified line voltage and power frequency . Before connecting the instrument to a power
A

A
Keyboard
Operation
-
909
/
911
source
,
be
sure to
check
the
CAUTION
note
on the
back
panel
just
above
the
power
cord
connector ,
and
connect
the
instrument
only to
the
power
line
frequency
and
voltage
indicated
in
the
note .
+00
After
connecting the
calculator to an
appropriate power
source ,
turn on the
Power
switch
under
the
right
front
corner of
the
instrument .
A
flashing display of
should appear . Press the red
button
at
the
upper
+00
left
corner of
the
keyboard ,
and
the
display will
change
to
a
steady
This
instrument is
designed
for
operation from a
power
source
with its
neutral
at or
near earth (
ground )
potential ,
with
a
separate
safety
-
earth
conductor . It is
not
intended
for
operation
from
two
phases
of a
multi -
phase
system ,
or
across
the
legs of a
single
-
phase
,
three
-
wire
system .
REMOTE
WARNING
00
.
KEY OPERATION
REMOTE
CLEAR
This
section of the
manual
discusses the
operation of
each of the
keys
and gives
some
simple
examples
. The
examples are
numbered in
sequence , to
permit
reference to them
from
other
areas
in
the
manual . In
some
places
where
two
or
more
examples
follow a
key
description , or
deal
with
closely
related
keys
,
examples
should be
performed
in
sequence ,
since
a
result may
depend
upon the
outcome of a
preceding
example . The
key
description is
organized
according to
locations on
the
keyboard
,
starting at the
upper left and
continuing
down
and
to
the
right .
gjeth
The
REMOTE key
functions
only
in
connection
with
the
use
of
peripheral
equipment
accompanying the
calculator .
Pressing
followed by
a
numerical
address
entry
addresses
a
particular
peripheral .
Details of the
addressing
procedure can
be
found in the
Calculator
Interfacing
Manual
,
TEKTRONIX
Part
No. 070-1280-00 .
1-3

Keyboard
Operation -
909 /
911
1-4
CLEAR
int
x
EXAMPLE
:
(
1 )
EXAMPLE
( 2 )
EXAMPLE
(
3
)
EXAMPLE
(
4 )
This
key is
pressed
immediately
after
the
Power
switch
is
turned
on ,
to stop
the
all -
zero
display
from
flashing
.
At
all
other
times
in
calculator
operation
writes
all
zeros
into
the
display
and
erases
all
active
operations
.
(
This
includes
setting
radians
if it is set
to
degrees
when
is
pressed
. )
CLEAR
is
also
usable in
some
cases as the
final step
in a
program .
Whenever a
program
requires
the
display
to
be
cleared
before
execution ,
DEG
RAD
CLEAR
since
can
be
pressed
instead
of
DISPLAY
simultaneously
clears the
display
,
extinguishes the key
lights
on
and completes the defining of the program .
CLEAR
DEFINE
f ( x )
When
the
display
quantity
,
use
of
CLEAR
CLEAR
int
x
CLEAR
I
CLEAR
x10⁰
1058030
Display
CO 6
D
3
To
round a
decimal
quantity
to
the next
higher
integer
when
the
decimal
is
greater
than
.5 ,
add
0300
int
x
2
CLEAR
int
x
shows
both
a
whole
-
number
and
a
decimal
eliminates the non - integer quantity
Display
+00
int x
CLEAR
3
30030EADE
+ O
5
DEFINE
f
( x )
int
x
65
.
DB
Display
If
the
decimal
quantity
is
less
than .5 ,
even the
procedure
used in
EXAMPLE
( 2 ) will
not
affect the
rounding - off
operation
.
+00
06
6 .
DODE
CLEAR
001
23 .
12554567891
to
+1.2
34560
int
x
int x
2
x
10+
05
Display
When the
display is in
mixed notation , entry
of
moves
the
decimal
point so
as to
leave
the
most
significant
digit as a
whole
number ,
and
applies the
correct
exponent
.

B
1X1²
EXAMPLE
( 5 )
log x
EXAMPLE
(
6
)
x²
EXAMPLE
(
7
)
DEFINE
f ( x )
f ( x )
Raises
the
absolute
value
of
the
number
displayed to the
power
of
the next data entered , up to the limits of the dynamic range of the
calculator
.
must be pressed before the result is
a
displayed .
CLEAR
CLEAR
or
3008
Display
Section
2
describes
the
important part
played by this key
in
calculator decision - making . Example ( 17 ) later in this section
shows another application of the key in finding roots of numbers .
2
Displays the logarithm of data in the display to the base 10. For
x < , the calculator finds log | x and flashes the display .
₂00
CLEAR
+
O
Squares
displayed data .
log x
Keyboard
Operation - 909 /
911
Display
+2.30 10 29996
In this display , 2 is the characteristic of the logarithm , and
.301029996 represents the mantissa , correct to nine decimal
places .
008 1 .
J00G
This key is pressed at the beginning and the end of a function
being programmed , to define the function . See Example ( 26 ) for a
demonstration of its use .
Display
Executes
a
programmed function
.
+000
00014 4 .
1-5

Keyboard Operation - 909 / 911
1-6
EXAMPLE
( 8 )
EXAMPLE
( 9 )
A
EXAMPLE
( 10 )
EXAMPLE
( 11 )
Finds the square root of the sum of the squares of the entered
data
.
To
display
the
result
,
enter x ,
press
enter
y
and
press
O.
CLEAR
CLEAR
3
CLEAR
3
CLEAR
or
3
Display
G
and
Display
+00
Display
+
to
solve
Example ( 8 )
shows the
solution
of the
square
root
of
the
sum
of
the squares . Example ( 9 ) demonstrates the use of
√x² +
y²
+
z²
where
x
=
3 ,
y
=
4 ,
and
z
= 12
,
and
( 3 ) ² +
( 4 ) ² +
( 12 ) ²
=
√169 =
13.
This
process
can
be
extended
to
any
number of
entries
,
as
long
as
the
sum of the
squares is
within the
range of the
calculator .
70080
2
FOO
Raises
e to
the
power
shown in the
display
.
Pressing this key
with
all zeros
displayed
causes
1 to
appear
in
the
display , since eº =
1 .
Pressing the key again displays e¹ , or +2.718281828 .
Display
Display
To prove Example ( 11 ) , enter
005
.
+2.7 18281828
0001 3 .
IXI
+2.7
1828 1828
+20.08553692
11
B

√x .
EXAMPLE
( 12 )
CLEAR
DISPLAY
EXAMPLE
( 13 )
Pressing this key displays the square root of any number greater
than or equal to zero . When x < , the calculator will find + √XI
and flash the
display until
is
pressed
.
CLEAR
085E
not reset
CLEAR
Display
CLEAR
Clears all non - zero numbers from the display , but does not clear
operations actively in process . Press
DISPLAY
to
correct
data
entered without affecting previously entered numbers in the
calculation . (
The
sequence
clears the calculation
in process , as well as the display . However , this key sequence does
to
radians ,
or stop a
display from
flashing . )
DEG
O
RAD
CLEAR
3
2
Keyboard Operation - 909 / 911
=
Opens parentheses , and permits operation on the group of terms
to
appear
within the
parentheses .
00.25 .
Closes
parentheses , and
displays the
result of the
calculations
within the parentheses . Can be used in place of
to
avoid
initiating the storage operation .
CLEAR
DISPLAY
+00
00000000
+
04 .
Display
In performing this operation , notice the all - zero display after
entering
and again
after
entering
which
demonstrates that the calculator clears the display upon entry of
any
of the
arithmetic
operation keys
C
D
I
to
allow
display of the next
entered variable .
Notice also
that
entry of
completes all
calculations
noted within the
X
1-7

Keyboard
Operation
- 909 / 911
1-8
EXAMPLE
( 14 )
In
x
-IX
EXAMPLE
( 15 )
@
EXAMPLE
( 16 )
EXAMPLE
( 17 )
parentheses , but that entry of
necessary to
display
the total
result .
CLEAR
10300008
Display
+ 7.3 3 3 3 3 3
3 33
Example ( 14 )
shows the
way
in
which the
calculator
performs a
strictly
hierarchical
operation if
the
parentheses
are
not entered
in
the
calculation .
Thus , the
calculator
performs
32
+ 2 = 7.333333333 .
6
CLEAR
In
x
2
Displays
the
logarithm
to the
base
e
(
2.71828
... ) of
displayed
data
.
For x <
,
the
calculator
finds 1n | x
and
flashes
the
resulting
display
.
CLEAR
CLEAR
Display
30708553094
300000
Display
370
+ O
IX1²
||
Calculates
the
reciprocal of
the data in
the
display .
This
key is
also
useful in
conjunction
with
۱۶۲
to
find
roots .
Display
or
another
+ O
+ O
000 3 .
3DE
C
0.0
1
is
2
0000 3 .

B
CARTESANA
(
YUDAROWA
ANTONIS
EXAMPLE
(
18 )
O
through
x10⁰⁰
EXAMPLE
(
19 )
D
9
Changes the
sign of
data
in
the
display . In
most
cases
, C
be pressed either preceding or following the data affected .
Pressing
C
twice
restores
the
original
sign
, but
causes
the
MARONES
calculator to
truncate the
two
undisplayed
guard
digits
.
ALAN
TENT
CLEAR
C
Keyboard
Operation -
909
/ 911
1000006 a
X
Display
O
+ O
5600 .
056 00 .
can
Display
For
additional use
of this key
, refer to
Examples ( 21 ) and
( 22 )
later in this section .
Displays
the
number
indicated
by the
key pressed . As
each new
digit is
entered
, the
previously
entered
digit
moves
one
place to the
left , until the display is filled by the entry of 10 digits . Each
last -
entered digit
becomes
the
new least
significant digit . As
soon
as the display is filled , additional numbers are rejected .
Illuminates x10 + 00
in the
display
.
After
pressing
x100
exponent of one or two digits ( up to ± 99 ) can be entered . The sign
of the exponent can be changed by entering either before or
after entry of the number keys . If an error is made in entering the
exponent , it can be corrected by pressing the two keys
representing the
correct
exponent . The display
is
converted from
floating point to scientific notation by pressing
The display remains in scientific notation
on
subsequent
computations
until
CLEAR
is
pressed .
Until
x10
is
pressed
, the
display remains in floating point notation until a result exceeds
the 10 - digit range . At such time as a result does exceed the display
x10⁰⁰
an
14
1-9

Keyboard
Operation
-
909
/ 911
1-10
EXAMPLE
( 20 )
EXAMPLE
( 21 )
EXAMPLE
( 22 )
O
EXAMPLE
(
23 )
EXAMPLE
( 24 )
range ,
the
calculator
automatically
converts
to
scientific
notation
.
It
reverts
to floating
point whenever
possible . If
,
while operating
in
scientific
notation ,
a
display occurs
whose decimal point
appears
within the
10
most
significant
digits ,
the
display
can be returned to floating point by pressing
twice .
DEG
O
RAD
CLEAR
00000
Display
C
CLEAR
DEG
O
RAD
CLEAR
CLEAR
x10
Display
DEG
O
O
RAD
00000
Display
2
+
1.
(
-
1.00
15
+
1.0
Display
+0000
Places the decimal point during entry of a number . In scientific or
mixed
notation , if the
displayed
number has less
than 10
significant
digits in the
mantissa
, decimal digits
can be
added
to
the
mantissa by
pressing
and the desired number . The sign
of the mantissa can be changed in scientific notation by pressing
C
Display
+7.668
00035
Display
x10
+ O
TOERGOON
Display
*
+
06
001
x
10
< 10
5
+06
06
00 1.
23x10
0000
x10
Ox10
+04
+06
+0000
1.23456x10
+06

A
O
πT
Ko
UNRELESE
EXAMPLE
( 25 )
EXAMPLE
( 26 )
|
( 27 )
Enters the
value of
into the
display . To
enter
-
,
press
Cin order . π can be entered into the display and operated
upon in conjunction with any of the special function keys in the
same
manner as any of the
to 9
number keys .
ENT
Provides a
simple
access to
the
internal
storage
system
,
which
remembers up to 26 numbers and their addresses . Storage of these
numbers does not reduce program step capacity . Any displayed
number can be equated to a constant with
a two - digit
subscript - and retained for future recall - by pressing
and the two
address digits .
Ko
CLEAR
CLEAR
DISPLAY
www
KO
CLEAR
DISPLAY
DEFINE
f ( x )
f ( x )
1289500
Display
+
Ko
12E - Oa
Display
KO
Display
Display
Display
Keyboard Operation - 909 / 911
+00
100000 :
+
+ O
OO .
Ko
+0000 123456 .
001
2
.
Ko
1 3 .
OO
01 4 .
DEFINE
f ( x )
( Correct operation of Example ( 27 ) depends on entry of Example
(
26
)
. )
Press
f ( x )
several times , and notice that each time you
do so , the
number
in the
display
increases
by one .
This is a very
simple example of the ability of the calculator to store a program
1-11

Keyboard Operation - 909 / 911
1-12
D
•
1
•
X
D
NANAY
D
||
DEG
RAD
and perform a function repeatedly without entering the function
every
time
. Section
2
provides a
detailed
explanation of
programming
methods and
techniques .
Divides the number displayed by the new data entered . The result
is displayed by pressing
Division by will cause the
display
to
flash
.
Multiplies the number displayed by the next data entered . The
result is displayed when
is
pressed .
Subtracts the next data entered from the number displayed . The
result is displayed when
is pressed .
Adds the number displayed to the next data entered . The result is
displayed
when
is
pressed .
KUNG
Displays the total result of all calculations entered since the last
and initiates the
DI
storage
CLEAR
or
operation .
CLEAR
DISPLAY
Ko
Selects the units of entry for trigonometric functions . When
CLEAR
is pressed , the RAD light is illuminated , and both the data
entered and the result of any trigonometric function will be in
radians . When the DEG light is illuminated , the number in the
display is in degrees , and data entered and results of operations
performed are in
degrees
.
Pressing
to
radians and
lights the
RAD
light
.
Pressing
to
radians ;
pressing
CLEAR
does
not .
Pressing
O
RAD
DEG
O
converts
data
displayed
resets
degrees
DISPLAY
twice
CLEAR
DEG
O
O
RAD
B

EXAMPLE
(
28 )
EXAMPLE
( 29 )
hyper
EXAMPLE
(
30 )
arc
tan x
Keyboard
Operation -
909
/
911
converts mixed or scientific notation to floating point when the
display has
an
absolute value
between
0000000001
and
9999999999 .
JO Display
+57.29577951
In
Example
( 28 ) , the
calculator
has converted
one
radian to its
equivalent
value
in
degrees .
CLEAR
CLEAR
CLEAR
DEG
RAD
arc
Display
In Example ( 29 ) , the calculator has converted 45 degrees to
radians .
hyper
As a
prefix ,
hyper
converts
trigonometric to
hyperbolic
functions ( sinh x , cosh x , tanh x ) . Pressed
as
prefixes
to
a
trigonometric function key ,
display the
inverse
function
( sinh - ¹x ,
cosh - 1x ,
tanh - ¹x
) .
hyper
or
hyper
DEG
RAD
O
DEG
O
RAD
hyper
arc
y
DEG
O
RAD
Display
sin x
+.7853981634
sin
x
DOBI
arc
hyper
sin x
+2.1
29279455
Display
+000
00 1.5
arc
Pressed as a prefix to a trigonometric function key ,
displays the inverse trig function ( arc sin x , arc cos x , arc tan x ) .
arc
Pressed
following
the
entry of a
value ( in
radians or
degrees ) for
an
angle ,
displays the
tangent of the
angle
.
1-13

Keyboard
Operation
-
909
/
911
1-14
EXAMPLE
(
31 )
COS X
X !
EXAMPLE
( 32 )
sin
x
EXAMPLE
( 33 )
EXAMPLE
( 34 )
Ког + Коз
Koz
CLEAR
S
CLEAR
DISPLAY
Display
Pressed following the entry of a value ( in radians or degrees ) for an
angle , displays the cosine of the angle .
DEG
RAD
BESA
5
Display
+ .70 / 106 / 812
(
Provided
this
example is
performed
following
Example ( 31
) . )
Otherwise , , must be pressed following
CLEAR
DISPLAY
DEG
O
O
RAD
tan x
THOMAST
ASKE
COS X
CLEAR
+
0000000001 .
Pressed
following the
entry
of
a
value
( in
radians or
degrees )
for an
angle ,
displays the
sine
of the
angle .
DO
Display
+.707 1067812
Again
, the
assumption is
made that
Example ( 33
) follows
Example
( 32 ) . These functions can be worked in degrees , because
does not cause DEG to revert to RAD .
sin x
KEYS FOUND ONLY ON THE STATISTICIAN 911
CLEAR
DISPLAY
Displays the factorial of the integer part of the entered data .
300 30
0012 .
CLEAR
DISPLAY
Display
Permits storage of an initial value in Ko2 and an increment in K03 ,
and the accumulation of a count by repeated pressing of

A
EXAMPLE
(
35 )
ΣΚΟΟ
EXAMPLE
(
36 )
ΣΚΟ1
Ког
+
Коз
= Koz
The
accumulated
count does not
display
during
the
count
,
and any other
calculation in
progress is not
disturbed
.
To
display the
accumulated
count
,
press
Ko
O E
2
CLEAR
DISPLAY
Ког + Коз
-
Koz
CLEAR
DISPLAY
.
11
+
Ког + Коз
Ког
Ko
Ког
Ког
>
Koo
Ko
20
Ko
Ког + Коз
Ког
3
.
Display
Permits changing the value of the number stored in Koo at any
time during a calculation without disturbing any calculation in
progress . To operate the key , press
enter the
number
to
be added to the register ( or subtracted if a negative number is
entered )
and
press
Koo
The new value stored in Koo will
appear in
the
display
whenever Koo
is
addressed .
@o
+00
tan
x
2
CLEAR
DISPLAY
Keyboard Operation - 909 / 911
Operation of this key is identical to that of
that
it
affects the
Ko₁ register . 1
hyper
SOB
3
Display
In Example ( 36 ) , the display will actually be a number larger by 3
than the number previously stored in Koo . If the register had no
previous
entry ,
the
display
will
read
Ko
0.00 3 .
I
5 .
CONVERSION OF 911 SPECIAL KEYS TO 909 EQUIVALENTS
Ког + Коз
Koz
Koo
The Statistician 911 keyboard has the
log x and
TY
keys
replaced
by the special keys listed above . Owners of Statistician 911 calculators can obtain the results
except
1-15

Keyboard Operation - 909 / 911
1-16
of
operations
with
these
four
909
keys by combining
the
functions
of
keys
found on the
911.
These
equivalents
are
shown
below
.
For
For
For
For
For
O
-1
.
For
tan x
O
log x
TT
A
1
hyper
DOC
2
hyper
"
hyper
enter x
and
key
in
enter x
and
key
in
key
in
sin x
COS X
CLEAR
I
I
DEG
O
O
RAD
@ODD
sin x
enter x
In
x
÷
000
and
key
000
enter
x
and
key
in
O
tan x
enter
x
and
key
in
DOO
enter x
KO
DEG
RAD
K₁
C08 X
In
x
enter x
enter
x
C
)
JOC
€
00
FER
OOO
JOG
+
Ko
O
KO
00
O
The
equivalent
operations
just described
will
operate
either
as
regular
keyboard
entries ,
or
as
parts of
defined
programs
.
For very
large
numbers ,
the
hyperbolic
equivalents
give
inaccurate
results .
B