Sharp COMPET ELSI-811 User manual

ELECTRONIC CALCULATOR WITH [ELSI]
esa mooeL EL=-811
INSTRUCTION MANUAL

CONTENTS
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FEATURES
EXTERNAL FEATURES ..
KEY IDENTIFICATION
SPECIFICATIONS
HOW TO REPLACE THE BATTERY UNIT.
CAUTION ON THE BATTERY UNIT
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INTRODUCTION
Sharp's amazing Compet EL-811 incorporating two ELSIs (Extra Large Scale Integration) another
major advancement in the world of space-age miniaturization. Y ears.of pioneering research and achieve-
ment in electronic engineering have enabled Sharp to develop an exceptionally remarkable to world’s
most personal electronic calculator with one memory register and double capacity mode, offering both
maximum portability and a wide range of mathematical versatility. The EL-811 is thoroughly reliable
and carries out calculations with amazing speed and efficiency. This booklet provides a detailed ex-
planation of the Compet EL-811’s operation.

FEATURES
fe
Ultra-compact. So small, it can be operated in the palm of your hand.
The utilization of ELSIs results in the reduction of overall dimensions and weight, increased reliability
and lower operating costs.
. Double capacity
In multiplication and division, answers up to maximum numbers of 16 digits can be obtained even
though EL-811 only has 8-digit display panel.
In division, can divide 16 digits by 8 digits. The upper 8 significant digits of the quotient are
obtained as a result and the lower digits are zeros, However, the integral number of the quotient
exceeds 8 digits, only the decimal position is memorized in the lower digits.
. Wide range of calculations
In addition to its four arithmetical calculations and double capacity calculation, successive multipli-
cation and division, repeat addition and subtraction, discount or tax calculation, memory calculation
and other mixed calculations can be quickly performed with maximum efficiency.
. Convenient constant multiplication and division
In multiplication or division, multiplicand or divisor is memorized as a constant number automatical-
ly. After performing the multiplication or division, constant calculations are performed by setting
variable number and (EB) key only.
Rapid charging
When AC power is supplied to the EL-811 through the AC adaptor, with the power switch is placed
in the OFF position, the battery can be charged approximately 3-hours. After charging, the EL-811
will
operate
on
battery
power
for
approximately
3.5-hour.
When
the
battery
is
charged
in
5-hour,
it is charged more perfectly.

6. Operates on three separate power sources
AC, built-in rechargeable battery or 12V car battery as desired.
7. Convenient lamps for memory, lower digits indicator, constant mode indicator, and
battery level indicator. (Refer to page 4 ‘External features” for further detailes)
8. “Zerosuppress system” makes reading figures easier.
9. Automatic clearing system
The machine is automatically cleared when the machine is turned on. Therefore, the calculation
can be started immediately,
10. Operation is possible even in the case of momentary power failure.
Even when the power cord is disconnected during operation with AC power source, the operation
can be continued.
11. Soft lighting green display
Our specially developed non-glare green display panel eliminates eye-strain, improves reading ease.
12.Convenient carrying case.
Always ready to go with you and assist you, whether it be in the office, schoo! or at home.

EXTERNAL FEATURES
(a)
(b)
(c)
(d)
CHARGING LAMP
When operating the EL-811 on AC adaptor, this lamp indicates
at all times. This lamp also indicates during rapid charging.
When the battery voltage is below the normal limit, this lamp
will be lit and will gradually fade as the battery voltage increases.
This state indicates batteries have been charged up to some extent.
MINUS SIGN INDICATOR (—)
Automatically indicates when the result becomes negative.
CONSTANT MODE INDICATOR (K)
Turns on when multiplication or division is performed by toudh-
ing 5, (gE. im} ) key, and multiplicand or divisor is mem
ed as a constant number automatically.
This indicator is turned off when the J. . Jo &
is touched after multiplication or division. (Refer to page 28
“4. Constant multiplication and division” for further detai
LOWER DIGITS INDICATOR /
BATTERY LEVEL INDICATOR (+)
Turns on when the lower digits of double capacity are displa’
by touching the key and turns off when the upper digits
displayed. Also, turns on when calculations can’t be performed |
by the decrease of the battery voltage. In this case, the indicator
will not turn off even when io} key is touched and miscalculation occurs.

(e) MEMORY LOADING INDICATOR (I)
Turns on, when the content of memory register is not zero.
(f) POWER SWITCH
ON — OFF position.
(a) When AC adaptor is connected with calculating unit and AC power source:
0) ON position: You can operate on AC power and the battery unit will be
charged during operation. The charging lamp indicates at all times. Even when
the power cord is disconnected during operation or in the case of momentary
—o4 power failure, the operation can be continued by battery power without mis-
calculation because a power source is exchanged the battery power automatical-
ly. In these cases, the charging lamp turns off.
@ OFF position: Performed rapid charging. (Refer to page 2 “Rapid charging’)
(b) When AC adaptor is not connected with calculating unit:
cal 0 ON position: You can operate on battery power.
Q OFF position: The calculating unit is not operated.
(c) When AC adaptor is connected with calculating unit and not connected with AC power source:
ON position: You can operate on battery power and charging lamp on AC
E adaptor does not indicate.
@ OFF position: The calculating unit is not operated.

KEY IDENTIFICATION
G Clear key
Depressed once after an entry, clears only the entry. When a mistaken number is entered
after setting a function (x or +), also clears the function. Depressed twice clears all the
contents except memory register.
[o} ~6 Numeral keys
Used for entering numbers.
| + | Decimal point key
Determines the decimal point position.
Change sign key
Changes the sign of the displayed number.
EQ Multiplication key
Orders multiplication and starts operation when chain calculations are performed.
B Division key
Orders division and starts operation when chain calculations are performed.
Plus-equal key
Orders addition. Also derives product or quotient with double capacity.

[-=| Minus-equal key
Orders subtraction. Also derives product or quotient with double capacity in the case of
negative multiplier or divisor,
Depressed after multiplication or division, clears the constant mode function.
Memory recall/Clear memory key
Depressed once summons the contents of memory on the display panel. Depressed twice
successively, clears the contents of memory.
Memory-plus key
a) Without multiplication or division function:
Orders to add the displayed figures to the contents of memory register.
b) With multiplication or division function:
Orders multiplication or division and adds its product or quotient to the contert of
memory register.
Upper / Lower digits recall key
Depressed once in the answer of double capacity, summons the lower digits of the answer
on the display panel.
Depressed twice successively, summons the upper digits again.