Commodore SR8120D, SR8140D, SR890D Owner's Manual
commodore
Models
SR8120D
SR8140D
SR890D
Scientific Electronic
Calculators
Owners
Manual
1
TABLE OF
CO
NTENTS
D
escription Page
Keyboard Layout 4
Key Index 5
Introduction 6
Display Description 8
Data Entry 9
Clear
Key 9
Four Function
Arithmetic
10
Chain Calculations
10
Correcting Operations
11
F Key 12
Using
the
Memory
13
Chain Calculations Using the Memory
14
Exponent Key 15
Power and Rool Keys
16
Chain
Calculations
Involving P
ower
Key 16
Bina ry to Decimal Conversion 17
Amorlization
Using
Power
and Memory 18
Hypotenuse
Calculations
19
-
...
--
Description
Radius
Ca
lculations Using
Pi
Transcendental Functions
Trigonometric Functions
Degree Mode
Ra
dian Mode
Radian Conversi
on
Appendix A
Improp
er
Opera tion
Over/low
Underflow
Append ix B
Operatin g Accuracy
Appendix
C
Power
a.
AC
Operalion
b. Batte ry Operation
c. Adapter Data
2
Page
20
21
24
24
25
26
27
27
27
28
29
29
30
-
Description
Page
Appendix 0
Service Informat ion
a. Low Power
31
b.
Sh ipping Instructions
31
c. Temperature Parameters
31
Appendix E
Guarantee
32
Sales and Service Centers
33
3
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--
- -
--
- -
KEYBOARD
10
'
ex
e._
Oi
sin
-I
COS
-I
tan
-
1
G
••••
STO 2
80000
00000
KEY INDEX
This
inde x
permits
quick
page location
of
the
description
and/or
the first use
of
each
function
key.
C
9
+ / -
10
x
10
=
10
10
+
11
11
12
13
13
13
13
15
16
5
lID
10'
..
"
sin-
1
cos-'
tan-'
16
20
21
21
21
"
24
24
24
24
24
24
24
,
TR
ODUCTION
Thank you
for
select
ing
our
new
scientilic
calculator.
II represents the finesl ach ievement in
solid
state large scale integrated /
metal
oxide
silicon
technology
,
The commonsense
logic
of
this
scientific
notation
calculator
is
the
key to
your
mastery
of
i
t.
You are able to
enter
basic assignments
just
as
you would
wri
te them
down
on pape r.
For
eJlample, 4 x
5:co
,is
entered
just as you
see
it. H
igher
math
arguments
Bfe
accom-
plished on
your
mini-computer
by again enter-
ing examples as they Bfe commonly written .
Th us, t
he
Log 019- the Log
of 4 is
inde)(ed:
9 l
og-4 Log
- .
Th is
emphasis
on
academic
principles
is a
consistent theme which runs throughoullhe
logic
01
your
new
mini-computer.
Students
will
appreciate
the
fact
that most
math
concepts
have been
programmed
into
the
logic
system. Among these
bas
ic tenets
are such
principles
as any
number
raised to
the zero
power
equa
ls one; and zero raised
to any
power
(excep t zero) equals zero. As
can
be seen, results will be precisely dis-
played for
immediate
comprehension
.
In short ,
our
Scien t
ific
was designed by
pro fessionals
for
professionals
and
students
alike. It has been
developed
as an easy-to-
understand
, easy-to-operate machine. Please
read t
hrough
the
pages
of
this manual
care-
fully. Become famil
iar
with
the keyboard
and
its
charac
teristics.
Wor
k through
the
examples.
6
They have been designed to gi
ve
you a t
hor-
ough
understanding
of
all functions. Pr
ofici
·
ency
is
gained
by
practice. Once
you
discover
how
easy
your
mini-computer
is to operate,
it
will
become
an essential,
enjoyable
aid
to
you
in
every area
of
computation.
A special
note concernin
g dis
pla
y ca
pacit
y
a
nd
machin
e l
ogi
c.
This
book
has been
prepared
to illustrate the
operation
01
a 14-digi t machine.
In the event you have selected a machine
with
a 12-
or
9-d
igit
capacity, you are
of course
restricted to an
entry
limited
by t
he
number
of
digits
in the mantissa
and
results
will
be
lruncated
in
accordance
with
the
capacity
of
the
display. This in
no
way
alters
the
accuracy
of
your
machine
as the
extra
digits
are
relained
within
the
unit's
logic
for
continued
comp
u-
la
lion.
Thus
, you can
work
all of the
problems
in
this
manual.
The treatment
of
numbers
be tween
+'
and
- 1
differs
among models. In all instances both
entry a
nd
result are accurate. However, some
models
wi
ll express these values in
scientific
no
tation.
Enter: Read:
Ex
amp
le A.
.002 X 2.
-03
Ex
ampl
e B.
.002 X
0.002
Bolh
results are identical.
7
NUMERICAL
ENTRY
o through 9 •
+/-
EE
sample display :
J~~~I~.
Sign El""n_"
"
Eo
""
...
nl
(14 digits):
(12 digits):
(9 digits):
0.123456789
102.34578
123.45
,
sign mantissa:
or
+ , blank on
display impl ies a pos itive number
90
99
..
mantissa:
10
digit
maximum
In
14·digit
display
8
digit
maximum in 12-digll
display.
5-dlgit maximum
In
9·digit
display.
Special
Ca
se: A result between 1 and
-1
which has
an
exponent
-01
is displayed
in
floating notation with a leading zero. This
affects the
display only. The l
ogic
01
the
calcu-
lator
realizes the true 10-digit result and the
ten
digit
accuracy
Is
retained in the machine.
Enter:
See Displayed:
2 3 = 0.666666666
Subsequent chain calculations wifl
be
computed using the true result retained internally
in scientific notation:
6.666666666 -
01
8
sign
of
exponent: -
or
+, blank implies
positive
expone
nt
field:
two
digits
maximum
Entry:
A number (the mantissa) is entered
just as written using the keys
0
Ihrough
9.
The sign of the mantissa can be entered at
any time
during a numerical
enlry
by pres-
sing the change sign key
+
/-
. The sign
of
the exponent
can
be
Changg
press ing
the change sign key
aUer the key
(enter exponent key) has been
prm.ed.
The exponent
lield
is blank until
I..:l.3I
is
entered.
C
The
clear
entry/
clear
key. Pressing the
C during
or
immediately
aller
a numer·
ical
entry will
clear
the display, Only
prior
entries are retained intact. Pressing the
C key
in
all other cases clears your
calculator; Memories are not cleared.
Enter:
2 + 3 c
Cl
n '
Enl'Y
4 = 6
c
In the above example,
we
wished
10
add 2
and 4
but
entered 3 by mistake. Pressing
C and entering 4 corrects t
he
error
and allows further computation. The linal
C
clears the calculator.
9
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