Commodore SR8120D User manual

commodore
Models
SR8120D
SR8140D
SR890D
ScientificElectronic
Calculators
Owners Manual

1
TABLE OF CO NTENTS
D esc ri ption 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
Binary to Decimal Conversion 17
Amorlization Using Power and Memory 18
Hypotenuse
Calculations 19
-
...

1- --
Description
Radius
Ca lculations Using Pi
Transcendental Functions
Trigonometric Functions
Degree Mode
Ra dian Mode
Radian Conversi
on
Appendix A
Improp er Operation
Over/low
Underflow
Appendix B
Operating Accuracy
Appendix C
Power
a.
AC Operalion
b. Battery Operation
c. Adapter Data
2
Page
20
21
24
24
25
26
27
27
27
28
29
29
30
-
De sc ription Page
Appendix 0
Service Information
a. L ow P ower
31
b. Shipping Instructions
31
c. Temperature Parameters
31
Appendix E
Guarantee 32
Sales and Service Centers
33
3

,-- ---- -- - - -- - -
KEYBOARD
10 ' ex
e._ Oi
sin -I COS -I tan -1
G ••••
STO 2
80000
00000
KEY INDEX
This index 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
,

r IN TR ODUCTION
Thank you for select ing our new scientilic
calculator.
II represents the finesl achievement in solid
state large scale in tegrated/ 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 paper.
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 ent er -
ing examples as they Bfe commonly written.
Thus, t he Log 019- the Log of 4 is inde)(ed:
9 l og-4 L og - .
This emphasis on academic principles is a
consistent theme wh ich runs throughoullhe
logic 01 your new min i- computer.
Students will appreciate the fact tha t most
math concepts have been programmed into
the
logic system. Among these bas ic te ne ts
are such
principles as any number raised to
the zero
power equa ls one; and zero raised
to any
power (except zero) equals zero. As
can be seen, results will be precisely dis-
played for immediate comprehension .
In short, our Scient ific was designed by
professionals
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
not e 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 -digit machine.
In the event you have selected a machine with
a 12- or 9-d igit capacity, you are of co urse
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 between +' 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~.
Sig n El "" n_"
"
Eo "" ... nl
(14 digits):
(12 digits):
(9 digits):
0.123456789
102.34578
123.45
,
sign mantissa: or + ,blank on
display implies a positive 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.
Th e 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 com-
puted 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 pressing
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

FOUR FUNCTION ARITHMETIC
+ x
Example:
Enter:
3 + 1- x
1.2 m +1- 2
=
+
Read: Explanation:
3. Enter - 3 and
multiply
1.2 - 02 Enter 1.2 x 10-2
-0.036 Perf
orm multipli-
cation and
display result
CHAIN CALCULATIONS
Example:
3x4
Calculate - 5- + .3
Enter: Read:
3 x 3.
4
4.
12.
5
5.
EKplanatlon:
Enter 3 and multiply
Enter 4
The mu lt iplication 3 x 4 is
performed, the result, 12,
Is displayed and divide is
entered.
Enter 5
10
Enter: Read: Explanation:
.3
=
2.4 The result of the division
12 + 5 is displayed and
divide is entered
0.3 Enter.3
8, The result of 3 ; 4 + .3
which is 8 in display
CORRECTING OPERATIONS
Example: Calculate 3 x 4
Enter: Read: E
xplanation:
3 + 3. Enler 3. We wish to multiply
but en ter ed + by mistake.
x 3. Enter the correct function key
4 4. Now enter 4
= 12. The result 013 x 4 is
displayed
In this manner any of the "four function" keys
(+ -x -;-) can be over wri ll en by another;
the final entry will be executed, For example:
Enter:
3 x +
4 =
Read: Elplanation :
11
- 1. The last lunclion
pressed, (-) is
execu ted.

I U,. oflh. D F," ";,, K"~
Your mini-computer has 29 keys, one of which
is a special function key marked "F,"
The application of this key enables you to
increase the feature range of your machine by
releasing twelve additional operations.
Nine of the 29 keys are inscribed with upper
ca se functions. If anyone of these keys is
pressed the lower case function is executed.
However, if the II key is indexed immediately
prior 10 pressing one of the " double function"
keys, the upper case function is performed.
Example:
Enter:
a. 2 11 3 =
b. C a 13 \Iy 3=
12
Read: Explanation:
8. Ra ise 2 to the
t
hird power.
2. Obtain the
cube root
of 8.
,
USING THE ME MO RY
Store: I!Z.!II STO 2
The store keys
refer to the two memory
registers and they store data for future use.
When
mliII is pressed, the value currenlly
on the display will be copied into Memory
Register 1. Similarly, when the
iii key is
~as a prefix to the memory key
~,the displayed data is copied into
Memory Register
2. Any data stored in the
register
prior to pressing the respective STO
key will be los t. This is referred to as "writing
over."
Recall: mil and R Cl2
These keys are used to recall data stored in
their associated memory registers. The
value stored in memory is copied onto the
display; the value on display prior to recall
is lost while the value stored in memory
is unaltered. To recall data in 5TO 2
,Press
key sequence II RCl 2 .
Example:
Enter: Read: Ex pl an ation:
5 5. Enter 5
mJI
5. Copies5 into memory register1
6 6. Enter 6
65 T02
6. Copies6 into memory register 2
13

Enter: Read: Ellplanation:
IIIDI 5.
DRCL2 6.
Clear :
The content 01 Memory 1 (5)
is copied onto the display.
Five remains in Memory 1.
The content of Memory 2 (6)
is copied onto the display.
Six is retained in Memory 2.
An individual mamory register can be cleared
by entering the key sequences:
C
~ Clears memory register 1.
C III STO 2 Clears memory register 2.
The C key need not be entered if O. is on the
display. However, you must still press the
appropriate storage entry keys to replace the
ellisting data with a zero value. Both memory
registers are
cleared at power on.
CHAtN CALCULATIONS USING MEMORY
Examples:
Enter: Read:
CD 3 x 5 x 4 -:- 6 = EiiII 10.
The result of the calculat ion (10) is dis-
played and stored in Memory 1
for future
recall.
14
,
Enter: Read:
® 3 + S +IimII=
18.
The value in Memory 1 ( 10 ) is added to 8
and the result is displayed. Memory 1
is unaffected.
o 3 x 5 x 4 -:- 6 = n 5TO 2 10.
The result of the calcu lation is displayed
and stored in Memory 2 f or future recall.
3 x 4 -:- II RCL 2 = 1.2
The value stored in Memory 2 (10)
is in-
cluded in the ca l culation and the resu lt
is displayed. Memory 2 Is unaltered.
EXPONENT KEY
m Enables entry of exponent values.
Enter:
5.5 IE 46
Read: Explanation:
5.5 46 We have
ent ered
5.5 x 1
()4 5
15

l1liWith tho power key, a number raised to any
power (or root) can be calculated. The base
;ry is en tered first, then the power key, and
finatly the
power (or root) to which the base
is to be raised. Powers are calculated using
the formula
y' = e ( ·l n ~ ) , VT= eC:~).
Therefore, negative bases are not per-
mitted. Any attempt to raise a negative base
to a
power witl resu1! in an error condition.
In addition to performing all commonly en-
countered powers and rools accurately and
quickly.
your calculator will correclly per-
form these
calculations:
DO = 1. XO=1, (»< =0 for x '" O.
<D Chain calculation involving Y' key
Calculate 3
)<.5 - x3 + 4 for x = 4
Enter: Read: Explanation:
3 x 3. Enler 3 and multiply
4. Enter 4 as the base
5 5. Enter 5
as the power
3072. Calculate and display 3 (4)~
and enter subtract
4. Enter 4, t"'e base
16
t
l
I
f
Enler : Read: Expla
nation:
3 3. Enter 3, the power
+ 3008. Calculate and display 3
(4)5
- (4)3 enler add
4 = 3012. 3 (4)5 - (4) 3 + 4 = 3012.
o Binary to det:imal conversion:
Convert the binary number 11011 to deci-
mal.1101 1 in base2isequal to2
4 + 23 +
2' + 20 in decimal.
Enler:
2
I'D
0 +
2 I'll
+
3 +
2m
4 =
Read: Explanation:
2. Enter 2, the base
1. Calculate &
display 20 and add
2. Enter 2, the base
3. Calculate & display 20 + 21
and add
2. Enter 2. the base
11. Calculate and display
2+2+2andadd
27. Terminate calculation &
display result
11011 base 2 = 27 base 10
17