HP HP-80 Benutzerhandbuch

UP'IIO

Hewlett-Packard's interest in computation evolved

a natural

extension of our traditional involvement in measurement problem

solving.

an early date, HP recognized the growing need for a

family of computational products designed to work easily and ef-

fectively with scientific instruments.

1966

introducedthefirst digital minicomputer specifically

designed to meet this need. Soon after, we followed up with our

first programmable calculator.

From

these beginnings, HP has now

become an acknowledged leaderin the field ofcomputational prob-

lem solving. More than 20,000 HP programmable calculators and

digital computers are at work in a wide range of applications in

science, industry, education, medicine, and business. Their effec-

tiveness

further enhanced by a complete line of accessory de-

vices, ranging from digital tape and disc drives to card and tape

readers, printers, and plotters.

Now we've coupled our experience in scientific problem solving

and computational technology to bring you new dimensions in

personal

computing-the

HP-35 Scientific Pocket Calculator for

engineering

cientific applications (with tens

thousands in the

field), and the HP-80 Business Pocket Calculator for solving prob-

lems in business and finance.

H E

ETT-PACKA

COMPANY,

1973

en,

Attention Please!

Even though your pocket calculator

simple to operate, and you

can start solving problems immediately by following the accessory

Quick Reference Guide, there are some things you should know

to get the most

out

of your HP-80.

Please read the Table of Contents and Introduction to become

familiar with the territory. Next read through the General Operat-

ingInstructions. Then

back to the Table of Contents, look up the

application you want to use, turn to the applicable pages, and do

the sample problems on your HP-80 according

the step-by-step

instructions.

isn't necessary to read anything else. (We included

some design philosophy in the back

your handbook because we

know that some

are

crazy about details. Also, it gives us a

chance to show off.)

Now you

can

take a mental vacation because you have this

trustworthy electronic business partner who will be handling things

while you're gone.

Table

Contents

HP-80 OWNER'S HANDBOOK

Introduction.

General Operating Instructions

Getting Started

Keyboard Description

Number Entry Keys

Number

Control Keys

.................

. . . .

....

Arithmetic

Function Keys

.........

...

Dual-Function Control Key

(Gold

Key)..

Standard/Extended

Function Keys

...

Basic Keys . . . . . . . .

......

Financial

Keys.

. . . . . . . . . . . .

Interactive

Keys.

. . . . . . . . . . . . . . . •. . •. . •. . .

Fundamental

Operations

Entering

Data.

Entering Negative

Numbers...

Rounding

Numbers..........

.. .

Loading Data .

. .

Arithmetic and Basic

Functions.

....

Financial and

teractive

Functions.

...•..

•

.....

Storing Constant Values

...............

..........

Clearing

Data.

......................

. . .

Performing Simple

Arithmetic

......

Manipulating Data

..............

.....

....

Reviewing

/Ve

rifying Data Entered

Reversing Operand

Order..

............

.....

Recalling a Constant Value from

Storage.

. . .

Basic Functions . .

....................

. .

....

Calculating Square

Root.

. . . . . . . . . . .

Calculating Percentage Problems

.........

Raising a Number to a Power

(Exponentiation)

........

Calculating Time Intervals

....

...

Calculating Future

Past

Dates.

. .

Determining Day of the Week

Special

Operations

Financial Functions

Interactive

Functions.

. . . . . .. . . .. . . .

Summation and Averaging

Calculations.

...

Sum-of-the-Digits Calculations

...........

....

Trend Line

Calculations.

. .

.•.

....

Applications

Investments

Compounded Amounts

.....

Future Value of Compounded Amount

...

Present Value

Compounded Amount

......

. . .

...

Rate of Interest

for

Compounded Amount

...

Number

Periods

for

Compounded

Amount

.........

Compounded

Amount

Inter

est

Earned

.............

Nominal

Rate Converted to Effective Annual Rate

.....

Effective Annual Rate Converted to Nominal Rate

.....

Annuities

. 29

Future Value

Annuity

(Sinking

Fund)

.....

Rate

Interest

lor

Sinking

Fund.

. . . . . . . . . . .

....

Payment

Amount

lor

Sinking Fund

...

Present Value

Annuity

...

Monthly

Payment

Annuity

(Direct

Reduction

Loan)

Bonds

...........................................

Bond Price . .

. . . .

....

Bond Yield " . . . . . . . . . . . . .

...

Depreciation

............................

. .

...

Sum-ol-the

Years' Digits Depreciation

...

Declining

Balance

Depreciation

..........

. . . . . . . 36

Discounted

Cash Flow

Analysis·

...

Loans

Annual

Percentage Rate

Interest on

Installment

Loans

................

Add-on

Interest to Annual Percentage

Rate Conversion . . . . . . . . . . . . . . . . . . . . . . . .

...

Accrued

Interest . . . . . . . . . . . . . . . . .

Discounted Note

.............

Accumulated

Interest Between Two Points, Remaining

Principal

...

.................

.....

....

Rebates on

Consumer

Loans (Rule

78's)

....

Merchandising, Purchasing

Cost

and Price

(Markup,

Chain

Discounts)

Cash

Discounts....

.......

Statistical Analysis

Mean, Standard Deviation . . . . . .. . . . .. . . . . .

Linear

Regression (Trend Line)

Analysis.

...

Denominate Number Conversion

US-to-Foreign

Currency

Conversion

....

. . .

....

Foreign-to-US

Currency

Conversion.

...

Appendixes:

Design Concepts. .

.............

. .

B. Combined Arithmetic Processes

C. Extended Bond Calculations

Operating Characteristics

E. Accessories

Service and Warranty

G. HP-80 Calculation Formulas

...........

Glossary

...

.....

...

~.",,,S

"jl

:,i,!

;;~

'0';

-U·

8 q 7

ftY'

,':

:;g

l:'

Introduction

When

Charles

Lamb

wasn't writing literary classic

he labored as

accountant for the

East

India

mpany. During his

dual

career

-1791

to 1825-he often expressed a dim view of the business

business as it was when the standard calculating equipment

consisted

a high stool, desk, quill pen, and a

human

brain-

had

perpetually a dread

some crisis to which I

should

found

unequal .

I served

over

again all night in my sleep,

and

would

awake

with terrors

imaginary false entries, errors in

accounts,

and

the like .

There

little

doubt

that

Lamb'

s frustration with the burdens of

his work sparked his creative

genius-had

he been content he

might never have written anything

lasting significance. (In fact,

his retirement from the East India

Company

mark

the

end

his productive period as a writer.)

the risk of depriving the world of

another

businessman-cum-

artist, we have produced a device

that

takes the drudgery

out

complex financial

and

business

calculations-and

makes them

more accurate, too.

The

tool

the HP-80 electronic answer-ma-

chine

that

weighs only nine ounces (you can

take

it anywhere

you

go-and

should),

and

replaces stacks of tricky tables

and

other

such "

inundat

a". It

the first pocket calculator to offer built-in

logic for solving business-oriented problems.

There

no compa-

rable tool available today!

you

sam

e of what

you

can

with

e HP-80,

itch the

calculator to ON a

work a typical compound

int

st problem.

Suppose you wanted

calculate the effective annual rate of return

an investment

a basis for evaluating various investment opportuni-

ties.

you

could buy property today for $10,000 and could expect

sell it

7 years for $15,000, what

wou

the annual rate of return

your original investment?

solve, simply enter

e known values

follows:

Key

7 (number

yea

rs)

and

press.

(number of periods

terms

time),

key

10000 (inilial investment) and press

iii

(present value),

key

15000 (amount

be returned) and press

iii

(future value), then

press.

(interest). Find

ur answer

(annual rate of return)

the display:. %

you want to see your answer showing six decimal places, press the

gold key. , key in 6, and see displayed: _ %

Compare that with the painful procedure used with the existing cal-

culation method:

Conventional

Method

Use

basic

formula:

S =

P(1

i)"

" = S

where:

S =

future

value

P = present

value

;::::

effective periodic rate

n =

number

periods

Thus'

" =

~~~~~~

= 1.50

Next,

consult

compound

interest table to find

the table value

closest

to 1.5000000. The

table

value

for

seven

years

is 1.4071004227,

while

the value

for

is 1.5036302590.

There-

fore, the

exact

annual

rate

return is some-

whe

between

and

6%.

Now

for

interpolation

(note

that

since

method

used

linear

interpolation,

the

answer

only

approximate).

Let:

X =

amount

between actual and low value

.01

(or

difference

between

two

table

values

0928995773 =

difference

between

lower

table

amount

1.4071004227 and

actual

1.50

.0965298363 =

difference

between

higher

and

lower

table

amounts.

Then,

set

the

equation

as a

proportion:

X _ .0928995773

:01

-.0965298363

Cross-multiply:

0965298363X =

.01

x .0928995773

= .000928995773

Divide by .0965298363:

=~~~;~:~;~;73

= .00962392363448

.96%

Finally·

Annual

rate

return

lower

table

rate

+ .96%

5.96%.

HP·80 Method

Key

in:

71i1

10000

.15000"

•

Find

answer

displayed:

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