Casio memory-8R User manual

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ELECTRONIC CALCULATOR
memory
INSTRUCTION MANUAL
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(Y-811)

INTRODUCTION
Dear customer.
Congratulations on your purchase of this pocketabje, persona)
electronic calculator with one memory.
Although extremely compact, it carries all the capabilities
you could require for daily calculation needs.8 digit
calculating capacity, automatic accumulation of results in
four functions, full floating decimal system with underflow,
constants for x/-=- f true credit balance, and a convenient S
key for mark-up/discounts.
To utilize the full features of this calculator, no special
training is required but we suggest you take a few minutes
with this instruction manual to become familiar with its
many abilities.
POWER SWITCH:
Move the switch to the right to start a calculation.
READ-OUT
0 .
Shows each entry and result through an 8-digit Digitrou tube panel.
Suppresses unnecessary 0's (zeroes).
NUMERAL/DECIMAL POINT KEYp] ~ j?] ,U :
Enters numerals. For decimal places use the key in its logical
sequence.
FUNCTION COMMAND KEYS 0 ,Q & 0:
Press the numeral and- (unction command keys in the same logical
sequence as the formula.
A full floating decimal and underflow system work in ail calculations to
protect significant digits.
EQUAL & AUTOMATIC ACCUMULATION KEY B:
Obtains answer and automatically accumulates it into the memory
positively.
PERCENT KEY S3 :
Performs percentage calculations, including mark-ups and discounts.
MEMORY RECALL KEY S3 :
Recalls contents of the memory without clearing the same.
CLEAR KEY 13 :
Clears display for correction. When depressed after function command,
it clears the entire machine except the memory.
To correct the function commands, depress the appropriate function
key ( Q ,0, Qor E 3 } successively.
ALL CLEAR KEY 53 :
Clears the entire machine including memory, and releases an overflow
check. There is no need to depress the 53 or fj3 key prior to starting
each new calculation.

B/DISPOSABLE DRY BATTERY
OR AC OPERATION
The calculator operates on either dry batteries or AC with the use of
the AC ADAPTOR.
DRY BATTERY OPERATION
With two A A size manganese dry batteries (SUM-3) it operates for
approximately9.5 hours continuously.
Even when battery power decreases, the display will merely darken but
cause no miscalculation. When you have finished your calculation, be
sure to switch off the power switch to save battery power. To change
batteries, put the power switch off first. Slide open the battery cover
and replace batteries.
AC OPERATION
(f you are in all 7V area, for instance, use a 11.7V AC ADAPTOR.
When you use an AC ADAPTOR of a different voltage, it may cause
damage to both the AC ADAPTOR and calculator.
Plug the applicable AC ADAPTOR (100, 117, 220 or 240V) into the
AC outlet and the cord into the calculator. When plugged in, battery
power supply stops automatically, so battery power is not wasted.
To prevent the damage to the calculator, USE ONLY THE AC
ADAPTOR recommended by your dealer.
3/BASiC OPERATIONAL.
EXAMPLES
EXAMPLE OPERATION READ-OUT
741 - 258 + 963 -1446
12 x 3.4 x 56 =2284.8
963 +25 “38.52
(123 + 654 -789)
x 2.5+5 =-300.3
741B258H963
12ES3E14Q56
123O6504B789B
205B5B
1446.
2284.8
~~38B2~
-SOOlT
-300.3
* A negative figure is displayed with minus {—) sign up to 7 digits.
Note: To perform a problem commencing with a negative figure,
operate Q B ENTRY in sequence.
-10-20+45 = 15

-^/CALCULATION WITH
A CONSTANT
ENTRY 0 Q (0 0) ENTRY B ♦ . • Obtains product (quotient)
ENTRY 'B * * * Obtains product (quotient)
---*-*-Number entered is set as a con-
•f
stant multiplier (divisor).
L
The constant is released when a normal calculation is performed.
EXAMPLE
OPERATION READ-OUT
m
314x123- 386.22
3.14 x456 — 1431.84
3.14 x 789 —2477.46
(K)
3652+275 = 13.28'
7854 +275 =28.56
9658 +275 =35.12
30140
□
123B
456B
3.14
3.14
386.22
1431.84
2477.46
275C
0
7854B
9658
275.
275.
1328
28.56
35.12
5/SQUARE/POWER G
RECIPROCALS
EXAMPLE OPERATION READ-OUT
2.5 2 — 625
2.5 3 — 15.625
2.5 4 - 39.0625
2050 El B
6.25
15.625
39.0625
1
{2 + 3) x 4.5
=0.0444444...
9876
123 + 456
= 17056994—
2030405
1 B
22.5
0.0444444
123045600
9876 B
_579
17.056994

6/MEMORY CALCULATION
*
. i
a) Automatic accumulation
(SENTRY
ENTRY
* Obtains answer and au¬
tomatically accumulates
it into - the memory
' positively.
* Be sure to depress the
* ■ * Recalls the accumulated
total in the memory.
-*»-Clears contents of the memory.
key prior to starting a memory calculation.
EXAMPLE OPERATION READ-OUT
53 x 2 —106
+ 1 2 6 x 3 . 4 = -884
194.4
1256 + 32.5 = 1288.5
+) 147-25 - 122
1410.5
2353132B
260304
1256
147
MB
106.
88.4
194.4
1288.5
122 .
1410.5
Note: To accumulate a number into the memory negatively, operate as
follows.
78.5 x 14.7 -1153.95
0 45 X 2.5 - 112.5
1041.45
780501407E3
14513205B
1153.95
- 112.5
1041.45
b) Direct access to the memory
Any number on display Is directly accumulated into the memory as
many times as the B key is depressed.
8 + 8 +{6 + 5 } +(6 + 5 )— 3 ~ 3
= 12.4
6H5
B3
B
Q

7/PERCENTAGE CALCULATION
The £3 key works with both multiplication and division. Depressing
the f[§ or |3 key after finishing percentage multiplication gives a mark¬
up or discount.
EXAMPLE
OPERATION
READ-OUT
[
290. j
40.
20% of 1450
. 290 145QQ20E3
Percentage of 580
against 1450 . . . 40% 580S314502
* A constant is also utilized in percentage calculation.
20% mark up of 1450
. .. 1740 1450E3 20213
20% discount of 1450
.. . 1160 14-500 202 D
1740.1
i
1160 .
O/OVERFLOW
Overflow takes place when an answer, whether intermediate or final,
or an accumulated total in the memory exceeds 8 digit integers {or 7
digits, when the figure is negative.) in all calculations and is indicated
by the "EV sign, stopping further calculation. To release the locked
registers caused by the overflow check, depress the £3 key.
EXAMPLE
OPERATION
READ-OUT
123456-78 x 9876
— 1219259159.28
123456SJ78E3
98762
123456.78
E.
0 .
{To start a new calculation.)
2

S/PRACTICAL. EXAMPLES
9-1 PRO-RATING
Division Sales amount 1
-. .. .5
%
A
$ 3,375 1
25
B
4,320 !
32
C
1.890 14
D
3.915
29
Total $13,500
100
OPERATION READ-OUT
33750
43200
189053
39150
0010
0
3375S
4320Q
1890S
3915
3375.
7695.
9585.
13500.
135.
135.
25.
32.
14.
29.
100 .
9-2 INVOICING
Article Q'ty
" ,J - '-- '
Unit price
----—--- ■ -
Discount Amount
A 100 $18.95
5%
$1,800.25
B 200 9.95
3%
1,930.30
C
300 13.95
10%
3,766.50
Total »
$7,497.05
. — .— i .
6% sales tax
449.823
Grand total
OPERATION READ-OUT
01000180950095
2000 90950097B
300013095009 S
180025
19303
3766.5
7497.05
449.823
7946.873
060
0

OPERATIONS:
Four basic functions, chain and mixed operation, constants for x/-r,
automatic accumulation in four functions, direct access to the memory,
percentage calculation including mark-up/discounts, square/powers,
reciprocals, true credit balance and calculation involving decimal places*
CAPACITY:
Entry/display. . . . . . . . 8 digits (7 digits for negatives)
Addition/subtraction.8 digits {? digits for negatives)
Multfplication/division.8 digits (? digits for negatives}
Accumulation into the memory.8 digits (7 digits for negatives)
OPERATING SYSTEM: 8y 3 working registers.
DECIMAL POINT: Full floating decimal point system with fool¬
proof underflow.
NEGATIVE NUMBER: Indicated by minus (—} sign on the left
of the figure.
OVERFLOW CHECK: indicated by the “ET sign, locking the
calculator.
READ-OUT: Zero suppression, Multi-Digitron tube panel.
MAIN COMPONENT: One chip LSI
POWER CONSUMPTION: 0.2w
POWER SOURCE:
AC: TOO, 117, 220 or 240V it 10V), 50/60Hz, with applicable AC
Adaptor.
DC: Two A A size manganese dry batteries (SUM-3) operate about 9.5
hours continuously.
Two AA size alkaline dry batteries (AM-3) operate about 21
hours continuously.
USABLE TEMPERATURE: 32°F - 104°F (0°C ~ 40°C)
DIMENSIONS: 23.8 mm H x 148 mm W x 72 mm D
(FHx 5-7/8"Wx2-7/8" D)
WEIGHT: 155 g (5.5oz) including batteries.
CARE OF YOUR MEW ELECTRO¬
NIC CALCULATOR
The calculator is a durable, precision-made instrument which wifi
provide you with years of trouble-free service.
To help ensure this we recommend that the inside of the calculator not
be touched. It is also inadvisable to subject the calculator to hard
knocks, drops, and unduly strong key pressing.
Extreme cold (below 32°F or 0°C), heat (about 104 < ’F or 40°C) and
humidity may also effect the function of the calculator. When you do
not use the calculator for a long period, take out the batteries to
prevent damage if the batteries leak. Special care should be taken not
to leave the dead batteries inside the calculator. Please make sure you
switch off the power when you finish your calculations or intend to
open the cover to change batteries.
Should the calculator need service, take the unit to the store where
purchased or to a nearby dealer.