Rockwell 18R User Manual

ROCKWELL

CUSTOMER

SERVICE

CENTERS

Out-of-Warranty Service If

the

calculator

failstooperate

satisfactorily

beyond

the

one-year

warranty

period,

Rockwell

Customer

Service

Centers

will

repair

and

return

the

calculator

to

youatour

prevailing

service rates.

United

States

847

Jerusalem

Road 2016

Big

Bend Blvd.

Scotch Plains,

Richmond

Heights,

NJ

07076

MO

63117

P.O.

Box

47147 Post Office

Drawer

5077

3550 McCall Place 950 OeGuigne

Dr.

Atlanta,GA30340

Sunnyvale,

CA 94088

Canada

90

Thorncliffe

Park Dr.

Toronto,

Ontario,

Canada

M48-1M5

WARRANlY

OUTSIDE

USA

AND

CANADA

226

R11-Q05

16

For

warranty

outsideofUSA

and Canada see

the

enclosed

warranty

card,orask

your

distributorl

dealer

for

warranty

information.

Service

Available

Outside

USA

and

Canada

British

Isles

Sumlock

Anita, Ltd. Service Centers are located

throughout

the

British Isles.

Consult

your

localtele-

phone

directory

for

your

nearest center.

France and

Germany

Rockwell - HWT, S.A. Rockwell International, Paris, France G.m.b.H.

Frankfurt,

Germany

Other

Countries

Contact

your

dealerordistributor.

2520-0-91

R27-75

10

8

1.ACjack (for optionalACadapter)

2. Battery

compartment

(door

on

back side)

3. Eight-digit display

4. Percent key

5. Equals key

6. Arithmetic function keys

7. Decimal key

8. Clear

entry/clear

key

9. On-Off switch

10. Memory keys

iOCopyright

1975,

Rockwell

International

2

GENERAL INFORMATION

Battery Installation Your calculator requires a 9-volt rectangular battery

for

its power. Remove

the

battery access

door

by sliding

the

latch

toward

the

outsideofthe

calculator.

Snap

the

battery clips

onto

the

battery.

Place

the

batteryinthe

calculator with

the

bottom

toward

the

door

latch.

Battery Replacement When

the

battery approaches

the

end

of

its useful life (See

the

Service

Tip

on page 4), replace it with a new standard 9-volt transistor radio battery; e.g., Panasonic 006P, Eveready

216,

or

equivalent. Operation

on

AlternatingCurrent (AC) Your calculator may also be operated from regular household

or

office power

with an

AC

adapter, either Rockwell

Model 105R for 110V

or

Model 106R

for11O/220V. TheACadapter

can be

.used withorwithoutabattery

installed

in

the

calculator. If

theACadapterisplug-

ged into

the

calculator, it must also be

plugged into an electrical

outletorthe

calculator will

not

work.

Accessories

The above adapters and a carrying case,

Model

205R,

are availableatyour

dealer

or

any

Rockwell Customer Service Center.

CAUTION: To avoid possible damage

to

3

your

calculator, use Rockwell AC

adapter

only.

Service

Tip Your calculatorisdesigned and manufacturedtogive

you

reliability and trouble-

free service. Consequently, very few

of

our calculators are returned for repairs. Most of

those returned are

foundtobe

due

to

battery

problems. Therefore,toavoid

the

inconvenienceofreturning

your

calculator

and being

without

it needlessly, we suggest

you

DO THE FOLLOWING BEFORE YOU

SEND IT

TOUSFOR

SERVICE:

1.

Try

a new, fresh

batteryinyour

calculator.

2. If

you

have a Rockwell AC adapter,

try

operating

your

calculator with it.

Be

sure

theACadapterisplugged into

an

AC

outlet.Ifthe

calculator functions

correctly,

your

batteryisprobably

dead and should be replaced.

3. Check

the

battery

connectortobe sure

it

is

"snapped"

securely

onto

the

bat-

tery

terminal.

If,

after

following

the

above suggestions,

your

calculator does

not

funCtion correctly

please return it

to

your

nearest Rockwell

CustomerServiceCenter. Refer

to

the

Con-

sumer Warrantyinthe

backofthis manual.

4

OPERATION

ON/OFF SWITCH Turning

the

calculatoronautomatically

clears

the

calculatortozero. The calculator

is

then ready for useinsolving problems.

DISPLAY Your calculator

will accept and display

the

following numbers.

1. Any positive number between

0.0000001 and 99,999,999.

2. Any negative number between

-.0000001

and

-9,999,999.

Resultsinexcessof8 digits

for

positive numbers and 7 digits for negative numbers are indicated by an Overflow Indicator (8

decimal points): 1.2.3.4.5.6.7.8.,

for

example. (In this circumstance,

all

keys

become inoperative

except

the

clear key

ICE!C

I. See ClearOperationsand Overflow

Conditions). A negative number

is

indicated by a minus

sign before

the

left-most digit in

the

dis-

play:

-456.23

for example.

NUMBER AND DECIMAL POINT ENTRY Pressing any number

entry

key enters

that

digit into

the

calculator and causes it

to

appearonthe

display. Turn

your

calcula-

toronand depress

the

2 and 4 keys. The

5

Display

0,

1 ,

1.

1.6

7.6666666 Display

5.

Display

o.

5.

4.

9.

3.

6.

Multiplication and Division

Keyboard Entry Display

7 7.

llil

7.

9

9.

El

63.

6

6.

El

10.5

Notice

that

the display shows each new

numerical

entry

as you depressthenumber

entry

keys and

the

resultofthe

you

depress

an arithmetic function key.

Addition

and'Subtraction

Keyboard Entry

ICE/cl

5

G

4

EJ

3

El

MIXED (CHAIN) CALCULATIONS

Addition, subtraction, multiplication, and division operations may be intermixed, or chained, as shown below:

(5 +6) 7 - 8

9

Keyboard Entry

5

When

you

wanttoenter

a decimal number,

depress

theOkey

following

the

number

after which

you

want

the

decimal

point

located. To

enter

1.6:

Keyboard

Entry

ICE/cl

1

o

6

display shows

the

following:

Keyboard

Entry

Display

2 2.

4

24.

ARITHMETIC OPERATIONS The

arithmetic

function keys, G ,G,0

and

El

,enter

the

desired arithmetic

operation

to

be performed.

The

answer

to such an operationisobtained by depressing

oneofthe

answer keys, G

or

ffi} ,

or

by

another

depressionofan arithmetic function key. Because this calculator has a FLOATING DECIMAL, it automatically places

the

decimal

pointinthe

correct

position

in

your

answers.

BASIC CALCULATIONS Your Rockwell 18R performs arithmetic calculations with algebraic logic. This means

your

calculatorworks

the

same way

you

thinkorwrite a problem.

6

7

8

6.

11.

7.

77.

8.

69.

9.

7.6666666

7

El

8

I±l

9

EJ

REPEAT

OPERATIONS

The

repeat

operation

capabilityofyour

Rockwell

18Risa

convenient

feature

that

enables

youtoadd,

subtract,

multiply

or

divide a seriesofidentical

numbers

with-

out

re-entering

the

numbers each

time.

For

example,

grocery items

with

values

of

1.69+2.98+2.98+2.98+0.49

=

11.12

wouldbeadded

as follows:

Keyboard

Entry

Display

1.69

G

2.98

CD

4.67

G

7.65

G

10.63

.

49

0.49

EJ

11.12

AUTOMATIC CONSTANT The

automatic

constantisanother

time-

saving feature. This

feature

enables

you

to

add,

subtract,

multiplyordividebythe

same

number

repeatedly

without

re-entering

the

number

for

each new calculation.

The

number

entered

after

the

last

arithmetic

function

key depressedisalways saved as

the

constant

(addend,

subtrahend,

multi-

plier,

or

divisor).

The

constant

function

is

the

last

arithmetic

function

key depressed

before depressing

theEJkey.Toperform

multiple operations with

the

saved con-

stant,

enter

a new augend,

minuend,

multi-

plicand

or

dividend,

and

depress

the

G

key

for

an answer.

For

example,toincrease a recipe which

normally serves

four

peopletoserve

seven,

multiply

each item in

the

recipe by

7/4or1.75,

as follows:

6 cups

flourx1.75=10.5

cups

flour

1.5

tps

salt x

1.75=2.625

tsp

salt

2 cups

milk x

1.75=3.5

cups milk

Keyboard

Entry

Display

6

6.

IRl

1.75

EJ

10.5

15 15

EJ

2.625

2 2.

EJ

3.5

In

all instances,

the

constantisretained

until a

different

numberisentered

after

an

arithmetic

function

keyisdepressed.

PERCENTAGE OPERATIONS The percent key,

~

,operates

just like

the

equal key,G,when multiplying

and

diViding

except

that

it causes

the

answer

to

be divided by

100

for

multiplication,

and

mUltipliedby100

for

division.

9

Discount Discounted

Amount

For example,tocalculate 1.5% monthly

charge

onadepartment

store

account

balanceof$340.00,

make

the

following

. entries:

Keyboard Entry Display

340

340.

!Rl1.5

1.5

~

5.1

As

another

example, suppose

you

have

answered

57of65

examination questions

correctly. What

is

your

percentageofcor-

rect answers?

Keyboard Entry Display

57

57.

El

65

65.

lID

87.6923

When used with

theEIor

G keys,

the

00

key performs ADD-ON and DISCOUNT calculations automatically. This capability is

another

time-saving feature when

you

wanttoaddorsubtract

a percentageofa

number

to

that

number.

To

perform an add-onordiscount opera-

tion,

enter

the

number

which

you

want

to

addonor

discount, depress

the

G key for

add

onorthe

Gkey

for

discount,

enter

the

desired percentage, depress

the

lID

key

to

display

the

amountofadd-onordis-

count,

and press

theEJkeytodisplay the

result.

Add-on and

discount

operations can be

10

chained if desired. For example, if a $20.00

itemisdiscounted by 15%and a

6%

sales

taxisadded,

whatisthe

total cost?

Keyboard Display Comments

Entry

20.00 20.00

G

15

15.

00+%

3.

EJ

17.00

6

6.

00

1.02

Sales

tax

(;J

18.02

Total

cost

MEMORY

OPERATIONS

Your Rockwell 18R has a completely independent storage memory which

is unaffected by arithmetic operations. This feature permits

youtostore

the

displayed

number and

then

recall ittothe

display when desired for subsequent operations. The functions

of

the

memory operation

keys,

~

and

~

,are

as follows:

Key Function

~

. Depressionofthe

[I.9 key

automatically clears

the

memory

and enters (stores)

the

displayed

number

in

the

memory. Neither

the displayed number nor any

arithmetic operation

is

affected.

Depression

of

the

B:§Y

key

causes

the

number storedinthe

memorytobe displayed. The mem-

oryisnot

clearedbythis

opera-

11

Sales

tax

Price

per

oz. See

above

note.

Price

for13ozs

at

the

price

per

ounce

fora10

oz.

box.

Since

the

store

price

of

the13oz.

box

is

73(itis

the

better

buy.

1.29

0.25

8.

2.

6.

0.12

2.12

1.29

3.41 .59

4.00

0.64

10.

0.064

13.

0.832

.59

EJ

~

.64

G1

10

IE]

13

G

.73

0.73

§C~++

0.73

4.00

4.73

1.19

G

5.92

Total

cost.

CLEAR

OPERATIONS

The clear key,

ICE/cl

, performs

three

functions:

1. Clears calculator. Depress

the

ICE/cl

tion.

The

"recalled"

number

may

be used as a

number

entry

for

the

operation.

The memory

in

your

18R calculatorisa

time-saving feature

that

allows

youtocal-

culate answers

to

everyday problems with-

out

the

needofpaper and pencil. The fol-

lowing example illustrates how this unique memory can be used

for

grocery shopping.

You

are abletodetermine

the

better

buy between competing products, calculate sales

tax,

and stiIIretain

the

totalofyour

shopping expenditures. The

total

price, including sales

tax,ofthe following grocery items may be calculated as shown below.

Mayonnaise

$1

.29

8 cans

cat

food

.25

ea

+6%tax

Vinegar

.59

Cereal: BoxA:10

ozs

at

64¢

Determine

the

BoxB:13

ozsat73(;

better

buy.

Peanut

Butter

~

TOTAL:

$5.92

NOTE:Todetermine

the

better

buy

of

two

choices, divide

the

priceofBox A by

the

ounces containedinit,

then

multiply

this price per ounce

by

the

ounces con-

tained in Box

B.

The resultisthe price

of

Box B if

the

cost per

ounce

was

the

same

as Box

A.

Keyboard Display Comments

Entry

1.29 1.29

12

13

key twicetoclear

the

calculator

(except

the

memory).

2. Corrects wrong

number

entry.

Depress

thelcE/cl

key

oncetoclear

just

the

latest

number

entry.

Then make a cor-

rect

entry

andgoon

with

your

calculation.

3. Cancels overflow

condition.

To cancel

an overflow

condition

(all decimal

points lit); depress

the

ICE/cl key twice.

OVERFLOW

CONDITIONS

The

following

operations

result in an over-

flow

condition

which

causes

the

Overflow

Indicator

to

light and all keys

except

ICE/cl

to

become inoperative.

1. Any positive answer

or

subtotal exceed-

ing 8 digits (greater

than

99,999,999.)

to

the

leftofthe

decimal point.

2.

Any

negative answerorsubtotal

exceed·

ing 7 digits (less

than

-9,999,999.)

to

the

leftofthe

decimal point.

3. Division

by

zero. Zeros and decimal

points

are displayed.

RECOVERY

TECHNIQUES

If

you

unintentionally depressanarith-

metic

function

key,

the

following techni-

ques allow easy correction

without

loss

of

the

displayed

number.

Unintentional 0

or

8J

:Depress 1,

then

the

correct

arithmetic

function

key.

Unintentional

[iJ

or

G :Depress

0,

then

the correct arithmetic function key.

14

FULL

ONE-YEAR

WARRANTY

(U.S.A.

and

Canada)

Rockwell International

Corporation

Electronic Calculator

The

following

warranty

has been

drafted

to

comply

with

the

new Federal law applicable

to

products

manufactured

after

July

4,1975.

Rockwell International

Corporation

warrants

this

electronic calculator

and

accessories (excluding

any

nonrechargeable

battery)

against

defects

in

materials

and

workmanship

and

operating mal-

functions

for

a periodofone

year

from

the

date

of

retail· purchase.

This

warrantyisfor

the

benefitofthe

original retail purchaser

and

any

subsequent

transferee during

the

warranty

period. In case

ofadefect,

malfunction,orother

failure

to

conformtothe

above

warranty,

Rockwell will,

at

its

option,

repair or replace

the

calculator

without

charge Within a reasonable

time

after

its

receipt

by

our

service center.

The

time

required

for

repairs willbeaddedtothe

warranty

period.

For

service

under

this

warranty,

simply return

the

calculator prepaid within

the

warranty

period

to

the

nearest Rockwell Customer Service

Center

listed below.

You

must also include a

copyofthe

sales receiptorother

proofofpurchase

date.

Calculators

returned

without

proofofpurchase

date

willbeserviced out-of-warrantyatour

prevailing service rates. Exclusions

and

Limitations

This

warranty

does

not

extendtoany

damage

or

malfunction resulting

from

misuse, neglect

or

accident.

The

remedies described above are

the

exclusive remedies under

this

warrantyorany

implied warranty,

andINNO

EVENT

SHALL

ROCKWELLBELIABLE

FOR

CONSEQUEN-

TIAL

DAMAGES.

15