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
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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.
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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.
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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.
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~~ 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.)
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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
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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
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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
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