Sharp COMPET-221 CS-221A User manual

SHA
ELE TR ON IC
CALC LAT R
WITH
AL L ~
CO MP ET· 221
MODEL CS-221A
IN TR UCT IO N MANUAL

CO NTEN TS
Introduction .......... . .................................... . . . . . . . .. ·- 2
Features 3
Hints . .. .. ............................ .. ..... .. ..... " .......... " 4
Voltage selector plug ........................................... . ..... 4
Key des l ign ation .......... . . ....... ................................. 5
Specifications 6
Operation .......................................................... 7
1. Addition and subtrac tion ...................................... 7
2. Mu Itiplication and successive multiplication
8
3. Division and successive division. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9
4. Sum (difference) of products and individual products ................ 10
5. Sum (difference) of quotients and individual quotients ............... 12
6. Product (quotient) of sums (differences) and individual sums (differences). 14
7. Discount calculation
............................ . ........ . ..... 15
8. Mu Itipl ication and division bv constant ............... . .......... 15
9. Mixed calculation ............................................ 18
10. Square
root extraction ................... .. .................... 18
11. Correcting mistakes
.......................... . .............. 19
Square root table .................................................... 20
- 1 -

I NTRODUCT I ON
Sharp's amazing CS-221A electronic calculator using MSls and ICs marks another major
advance in modern business methods. Years of pioneering research and resourcefulness
in electronic engineering has enabled Sharp to develop an exceptionally remarkable
desk calculator.
The CS-221A is thoroughly reliable and carries out complicated calculations with ama-
zing speed and efficiency. This booklet has been prepared to give current users and
prospective buyers a detailed understanding of the scope and breadth of the machine's
operation.
- 2 -

F EATURES
* Fully Integrated Circuit (lC)
Advanced MOS-MSls (Metal Oxide Semi-conductor Middle Scale Integrations and
MOS-ICs (Metal Oxide Semi-conductor Integrated Circuits) enormously reduce the
amount
of working parts and ensure greater dependability through superior trouble-
free performance.
* Compact and easy to carry
Space-age all IC design and unique memory device make the CS-221A amazingly
compact and light; can
be carried anywhere with utmost ease and convenience.
* Wide ra nge of ca lc ulati ons
In addition to its four arithmetical operations, mUltiplication, division by constant,
discount calculation and memory calculation
can be quickly carried out with maxi-
mum efficiency.
* Ease of opera ti on
Simplified operations such as AxBxCx ... =, A.-;-B.-;-C ... = etc. require no special
training. The answer
to almost any practical mathematical problem appears instantly;
* Eas y to read display panel
Snap reading with newly developed green numeral indicator. Does not cause eye
strain
with long use.
* Automatic decimal positioning
Tabulation selector specifies the decimal positioning automatically.
* Min us sign indicator
Automatically turns on when the result is negative.
* Overflow error check system
When the result of calculation exceeds 12 digits, all the decimal points automatically
turn on and calculation function stops. No worry about mistake by overflow .
* Double-setting protection keys
Numeral keys are so designed that no two keys are set at a time. This eliminates
error,
speeds up operation . . ... no worry about double-setting of keys.
* Sophisticated styling
Lightweight, noiseless and easy-to-carry the CS-221 A enhances office decors, im-
proves
working morale, increases efficiency.
- 3-

HINTS
1. As highly sensitive ICs, and electronic components are used, avoid placing the unit
in hot, dusty or humid locations.
2. Be sure to turn off the unit before disconnecting the power cord.
3. Do not jolt or drop the unit.
4. Do not stand it on its side or turn it over.
5. Do not place articles on top of the unit.
6. When cleaning the cabinet use the enclosed cloth. Do not use a wet cloth or any
organic solutions such as kerosene or benzine.
7. When not in use, keep the unit covered.

8
K EY DE SIGNATI ON
1,:
Tabulation selector
Specifies decimal places
(0 , 1, 2, 3, 4, 6).
(QJ-ill) Numeral keys
8 Decimal point key
@ Clear entry key
Clears figures mistakenly set.
~ Clear key
Clears all the contents in the calculator.
® Multiplication key
Orders
multiplication function.
ffi Division key
Orders division
function.
@ Equal key
Derives sum, product, and quotient.
S Red equal key
Derives difference.
Memory function selector
(
~) When the Memory function selector is set to "~" position, the read-in
numbers are entered by@)key
rSl into the memory register and accumu-
lated there. Therefore, sum (difference)
of products (quotients) can be
calculated. And constant calculation can be performed by entering
a constant
with @keyrSJinto the memory register and by call ing it back
to the display (X register).
( N) For non-memory calculations
(MR) When the
Memory function selector is set to "MR" position, the con-
tents in the memory register are called back
to the display (X register).
The contents in the
memory register are cleared by depressing &tJ key
after this selector is set to "MR" position.
- 5 -

~~ Constant switch
Remembers constant and functions'. If the switch is set to "x" position, multipli-
cation function and multiplicand are remembered. If set to "--;.-" position, division
function and divisor are remembered. After setting the switch, constant catcu lations
are carried out by setting variables andElkey only.
If set to "N" position, the remembered functions are cleared.
SPEC IFICA TIO NS
Power source: AC 120V, 60Hz
Capacity: 12 digits, 6 digit decimals
Add ition & Subtraction: 12 digits ± 12 digits = 12 digits
Multiplication: Total digits
of Multiplier and Multiplicand : Up to 12 digits,
Product: Up to
12 digits
Division:
11 digits -;- 11 digits = 12 digits -divisor digit
Decimal point:
Preset decimal point
Negativ
e:
Minus sign indication
Calcu la tion speed:
Addition & subtraction 0.03 sec.
Multiplication 0.18 sec.
Division 0.19 sec .
MOS MSls: 2
MOS ICs: 35
Transistors: 48
Diodes: 290
Clock pulse: 50 kHz
Temperature:
O°C -40°C (320 F - 1040 F)
P
ow er consumption: 16W
Dimen
sio ns:
255mm wide, 1 07mm high, 310mm deep
(10" wide, 41/4" high, 121/4" deep)
Weight: 3.7
kg (8.14 Ibs.)
- 6 -

OP ERA TION
1. Connect the power cord to an electric outlet, and turn the unit on.
Be sure to touchi (;. ·' key before starting calculations.
2. When not carrying out constant calculation. be sure to set the constant switch to uN"
position.
1. Addition and Subtraction
* Sum. Difference: Up to 12 digits (6 digit decimals)
Ex. 1-1 123 + 456 + 789 = 1368
Steps Operation Display Note
1 TAB=O Tabulation selector
2 123 123
3 @ 123
4 456 456
5 @ 579
6 789 789
7 @ 1368 Sum
Ex.
1-2 0. 12+0.3584+0.235=0.7134
Steps Operation Display Note
1 TAB=4 Tabulation selector
2 .12 0.12
3 @ 0.1200
4 .3584 0.3584
5
§J
0.4784
6 .235 0.235
7
§J
0.7134
Sum
- 7 -

Ex. 1-3 35.62 -0.53 -40.15 = -5.06
Steps Operation Display Note
1
TAB=2
Tabulation selector
2 35.62 35.62
3 § 35.62
4 .53 0.53
5 a 35.09
6 40.15 40.15
7
iii
5. 06- Difference
Note:
Use § key for addition. Use EI key for subtraction.
2. Multiplication and Succ essiv e multiplication
* Total digits of multiplier and multiplicand: Up to 12 digits (6 digit decimals)
* Product: Up to 12 digits (6 digit decimals)
Note: Set to theTabulation selector number largerthan the required decimal digits.
Ex 2-1 1.1 x 2.2 = 2.42
Steps Operation Display Note
1 TAB=2
Tabulation selector
2
1.1
1.1
3 ® 1.1
4 2.2 2.2
5 § 2.42 Product
- 8 -

Ex. 2-2 2.2 x 3.3 x 4.4 x 5.5 =175.6920
Operation Display
Note
Steps l, Tabulation selector
TAB=4
1
2.2
2 2.2
3 2.2
0
4 3.3
3.3
7.26
5 0 4.4
6 4.4
@
7
31.944
5.5
8 5.5
§
9 175.6920 Product
Note 1) When the decimal digits of the product are smaller than the specified Tabulation
selector number, the decimal
point is automatically positioned. When the de cimal
digit s of the product are larger than the spe cified Tabulation selector number, the
selector specifies the decimal digits.
2) For furthe r continued Successive Multip lica tion. touch the § key repeatedly and
proceed
with the calculation s.
3. Division and Successive div i sion
* Dividend: Up to 11 digits (6 digit decimals)
11- Divisor: Up to 11 digits (6 digit decimals)
* Ouotient: Up to 11 digits (6 digit decimals)
Note: Set to the Tabulation dial number larger than the required decimal digit s.
E x. 3-1 43 6. 524 ...;- 2 = 218.262
Note
Display
Operation
Steps
Tabulation selector
TAB=3
1 I
436.524
436.524
2
Quotient
3
4
5
ffi
2
§
436.524
2
218.262
- 9 -

---
Ex. 3-2 256 -;- 12 -;- 0.56 = 38.095237
I I
Steps Operation Display Nott I
1 TAB=6 ! I Tabu lation s
ele c tor
I
2 256 256
I ',;,
3 I ffi 256
4
12
12
!
5
ffi
21.333333
6
.56
I 0.56
I
7
§)
38.095237 Quotient
I
Note
1} For further continued Successive Division, touch t±l key repeatedly to proceed wl1h the
cal- culations.
4. Sum (Difference) of products and Indivi du al products
... Capacity: Same as for multiplication
Ex. 4- 1 (123 x 0.55) + (43 x 0.76) = 100.33
Steps
2
3
4
5
6
7
8
9
10
11
Operation
~ r
TAB=2
123
0
.55
§
43
0
.76
§
~,
Displav
123
123
0.55
67.65
43
43
0.76
32.68
100.33
NO Te
iv1!:'~~'" .'
- -{. .. . ....
T bu
...J ·32Ie~ ... _ '"
(product) ,
:
'lamp on
(product)
Sum
of pmdu c ts
- 10-

--
- -- - --
---
Ex. 4 - 2 (12.3 x 9.8) -(2,3 x 4.32) = 110,6040
Steps
2
3
4
5
6
7
8
9
10
11
Operation
~l:
TAB=4
12,3
0
9.8
§
2.3
0
4.32
a
~ ....
Display
12.3
12,3
9.8
120.5400
2.3
2,3
4.32
9.9360 -
110.6040
Note
Memory function
selector
Tabulation selector
(product) ,
:::D lamp on
(product)
Difference
of
products
Ex. 4 - 3 (46.9 x 3.51) + (83.4 x 7.2) -(65.3 x 4.73) == 456.2300
Steps
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Operation
ljr
TAB=4
46.9
®
3.51
§
83.4
®
7.2
@
65.3
@
4.73
a
~~
Display
46.9
46,9
3.51
164.6190
83.4
83.4
7.2
600.4800
65.3
65.3
4.73
308,8690 -
456.2300
Note
Memory
function
selector
Tabulation selector
(product),
.,} l
amp on
(product)
(product)
Ans.
- 11 -

5. Sum (Difference) of Quotients and indivi du al quotients
* Capacity:
Same as for Division
Ex. 5 - 1 (1288 -c:- 23) + (0.8674) =56.2150
Steps Operation I
I Display I
Note
~ r
I I
Memory fun ction
selector
2 TAB=4
Tabulation se le c tor
3 1288 1288
4 ffi
12 88
5 23
23
6 § 56.0000
(quotient) ,
,,
', lamp on
7 , .86 0.86
8
9 4 0,86
4 I
10
§ 0.2150 I
(quotient)
11
"'
L
56 .2150 I Sum of quotients
- 12 -

Ex. 5 - 2 (11.502
-:- 2.7) -(0.96 -:-5) =4.0680
Steps Operation Display Note
I--
. .-
~'
Memory function
se lector
2
TAB=4
Tabulation se lector
3 11.502 11.5
02
4
ffi
11.502
5 2.7 2.7
6 § 4.2600 (quotient).
I lamp on
7 .96 0.96
8
f±l
0.96
9 5 5
10
EJ
0.1920 -(quotient)
11
~"
4.0680
Differ ence of quotients
Ex. 5 - 3 (568
-'- 4) + (0 .586 -:- 2) -(35.8 -;- 9.308) = 138. 4469
Steps Operation Display
Not e
2
3
4
5
6
7
8
9
10
11
12
13
14
15 !
L"
TAB=4
568
}1
4
El
.586
Gl
2
El
35.8
r±l
9.308
EI
~~
568
568
4
142.0000
0.586
0.586
2
0.2930
35.8
35.8
9.308
3.8461 -
138.4469
Memory
function
selector
T
abu lation sele ctor
(quotient) .
.1. lamp on
(quotient)
(quotient)
Ans.
- 13 -

6. Product (Quotient) of Sums (Differences) and individual Sums (Di ffer ences)
* Capacity: Same as for Multiplication or Division.
EX.6 - 1 (35+ 186) x (8+47)= 12155
Steps Operation Display Note
1
~ t
Memory function
selector
2 TAB=O Tabulation selector
3 35 35
4
@)
35 CD lamp on
5 186 186
6 §) 186
7 © 0
8
8-
8 8 Memory function
9 §) 8
sele c tor
10
47 47
11
§
55
12
® 55
13
IJ,..
221
14 § 12155 (product
of sums)
Ex. 6 - 2 (286 -35) x (86 -55) = 7781
Steps Operation Display
Note
1
Ll£
Memory function
selector
2 TAB=O Tabulation selector
3 286 286
4 = 286 OJlamp on
5 35 35
6 e
35
7 © 0
8 BN 86 86
Memory function
9 §
86
selector
10 55
55
11
a
31
31
12
~
251
13
~..,
(product of differences)
7781
§
14
- 14 -

7. Discount calculation
* Capacity: Same as for Multiplication
Ex. 7 1234 -1234 x 0.07 = 1147.62 (7% discount)
Steps Operation I
Di splay
Note
1
TAB=2
! Tabulation
sele c to r
2 1234 1234
3
~
1234
4 .07 0.07
5 §
86 . 38
6 a 1147.62
8. Mu ltiplication and Division by Constant
A) When using the constant switch
* Capacity: Same as for Multiplication or Division
* Constant: Multiplicand
or Divisor
Ex. 8 - 1
1) 99.99 x 11.11 = 1110.8889
2) illt,99.x 33.33 = 3332.6667
3) 99.99 x 44.44 = 4443.5556
Steps I Operation ()isplay ,
Note
1
1'-
Con st ant switch
2
TAB=4
Tabulation
sele c tor
3 99.99 99.99
4 0 99.99
5 11.11 . 11.11
6
§) 1110.8889 Pr oduct
7 33.33 33.33
8 § 3332.6667 Product
9 44.44 44.44
10 J
§)
I 4443.5556 Product
Note: When t
he constant s wit ch is set to "X" position, multiplication fun ction and multipl icand
are remembered.
-15 -

Ex. 8- 2 1) 11.11 -7- 77 . 77 =0.142857
2)
33.33
-7- 77.77 =0.428571
3)
44.44
-7- 77.77 = 0.571428
Steps Operation Display Note
1
01
Constant switch
2
TAB=6
Tabulation selector
3 11. 11
11.11
4
ffi
11 . 11
5
77 . 77
77.77
6
@l
0.142857
Quotient
7 33.33 33.33
8
@]
0.428571 Quotient
9 44.44 44.44
10
@l
0.571428 Quotient
Note:
When the constant switch is set to
position, division
function and divisor are
remembered.
-16 -

B) When using the memory bank
Ex . 8 - 3 14 .14 x 26 x 163 = 59925.32
14.14 x 74 x 237 = 247987.32
14.14 x 36 x 502 =255538.08
Steps
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Display
Operation
~t
TA8=2
14.14
§
8" @
26
@
163
§
74
0
237
~
~.
§
36
~
502
@
~
14.14
14.14
14.14
26
367.64
163
59925.32
74
74
237
17538
14.14
247987.32
36
36
502
18072
14.14
Note
Memory function
selector
Tabulation selector
constant
Ans.
Ans.
§
Ans.
255538.08
21
- 17 -

9. Mixed calculation
* Capacity: Same as for Addition, Subtraction, Multiplication and Division.
(5 + 12) x 0.2 + 48 -16 =
885
Ex.9
4 .
Note
Display
Operation
Steps
Tabulation selector
TAB=2
1 5
5
2 §) 5.00
3 12
12
4 17.00
§)
5 @ 17.00
6 0.2
.2
7
§)
3.40
8 48
48
9 §) 51.40
10
I
16
16
11
I
35.40
12
EI
I
35.40
13
ffi
4
4
14 Ans.
§) 8.85
15
10. Squar e root extraction
Express the approximate expression
of jR as follows:
JR =: (N + R) x S
Steps: (See attached table on page20.)
1. Take 3 digits from the figures counting from the left.
Determine N, which
is the nearest value in the square root table.
2. Divide R into groups of two digits each from the decimal point.
When the highest group consists
of one digit, determine S from row IN in the table.
When
it consists of two digits, determine S from row 10 N of the table.
3. Ca lculate (N + R) x s.
Ex. 10 - /5 3 987
1. Determine N = 542=54200 (to equalize the digits)
2. Then determine
that S= 214768 from the row IN.
3. Calculate (54200 + 53987) x 214768.
. 18 .

Steps Operation Display Note
1 TAB=O Tabulation selector
2 54200 54200
3
El
54200
4 53987 53987
5
El
108187
6
~
108187
7 214768 214768
8
§l
23235105616 Ans.
Note: Five digits
from the top are available.
The position
of the decimal point is decided by dividing R into groups of two digits
each counting from the decimal point.
Taking J53987,
for example, 53987 is divided into three~ groups (5 : 39 :87) counting
from the decimal point. The decimal point of the answer, therefore, must be placed
between the thi
rd* and the fourth digit counting from the left. The answer is 232.35.
11. Correcting mis takes
A) Numeral correction
Ex.11-1 123x556 (mistake) 456
----r= ~
Steps Operation Display Note --
1 TAB=O Tabulation selector
2 123 123
3
~
123
4
556
556
5 @ 0
6 456 456
7 @ 56088
B) Function key correction ((R@ keys)
Function key correction
is possible in multiplication and division as follows:
A
@l±J BEl. . . . . .. A -;- B will be performed instead of Ax B.
Al±J @BEl ....... A x B will be performed instead of A -;- B.
- 19 -