Texas Instruments TI-80 User Manual
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TI-80

GRAPHING CALCULATOR

GUIDEBOOK

TI-GRAPHLINK,Calculator-BasedLaboratory, CBL, CBL 2,Calculator-BasedRanger, CBR, Constant Memory, Automatic Power Down, APD, and EOS are trademarks of Texas Instruments Incorporated.

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Concerning

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Radio Frequency

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Table of Contents

This manual describes how to use the TI.80 Graphing Calculator. Getting Started gives a quick overview of its features. The first chapter gives general instructions on operating the TI.80. Other chapters describe its interactive features. The applications in Chapter 11 show how to use these features together.

 

Using this Guidebook Effectively....................

viii

 

Glossary .........................................

xii

Getting Started:

TI-80 Keyboard ...................................

2

Do This First!

First Steps .......................................

3

 

TI-80 Menus......................................

4

 

Entering a Calculation: Compound Interest ...........

5

 

Continuing a Calculation ...........................

6

 

Defining a Function: Box with Lid ...................

7

 

Defining a Table of Values..........................

8

 

Zooming In on the Table ...........................

9

 

Changing the Viewing Window......................

11

 

Displaying and Tracing the Graph ...................

12

 

Zooming In on the Graph...........................

13

 

Other TI-80 Features ..............................

14

Chapter 1:

Turning the TI-80On and Off.......................

1-2

Operating the

Setting the Display Contrast ........................

1-3

TI-80

The Display ......................................

1-4

 

Entering Expressions and Instructions ...............

1-6

 

The Edit Keys ....................................

1-8

 

Setting Modes ....................................

1-9

 

TI-80 Modes......................................

1-10

 

Variable Names ...................................

1-12

 

Storing and Recalling Variable Values................

1-13

 

Last Entry........................................

1-14

 

Last Answer ......................................

1-16

 

TI-80 Menus......................................

1-17

 

The VARS and Y-VARS Menus......................

1-19

 

EOS (Equation Operating System) ..................

1-20

 

Error Conditions .................................

1-22

Introduction iii

Chapter 2:

Getting Started: Lottery Chances ....................

2-2

Math, Angle, and

Using the TI-80 Functions ..........................

2-3

Test Operations

Keyboard Math Operations .........................

2-4

 

MATH MATH Operations ...........................

2-7

 

MATH NUM (Number) Operations...................

2-10

 

MATH PRB (Probability) Operations.................

2-12

 

ANGLE Operations ................................

2-14

 

TEST (Relational) Operations.......................

2-16

Chapter 3:

Getting Started: Working with Fractions .............

3-2

Fractions

Setting Modes for Fraction Results ..................

3-4

 

Entering and Using Fractions in Calculations .........

3-6

 

The FRACTION Menu..............................

3-8

Chapter 4:

Getting Started: Graphing a Circle ...................

4-2

Function

Defining a Graph..................................

4-3

Graphing

Setting Graph Modes ..............................

4-4

 

Defining Functions in the Y= List....................

4-5

 

Evaluating Y= Functions in Expressions.............

4-7

 

Selecting Functions ...............................

4-8

 

Defining the Viewing Window ......................

4-9

 

Displaying a Graph ................................

4-11

 

Exploring a Graph with the Free-MovingCursor......

4-12

 

Exploring a Graph with TRACE .....................

4-13

 

Exploring a Graph with ZOOM ......................

4-15

 

Setting the Zoom Factors ..........................

4-18

Chapter 5:

Getting Started: Path of a Ball ......................

5-2

Parametric

Defining and Displaying a Parametric Graph ..........

5-3

Graphing

Exploring a Parametric Graph ......................

5-6

iv Introduction

Chapter 6:

Getting Started: Roots of a Function .................

6-2

Tables

Defining the Independent Variable ..................

6-3

 

Defining the Dependent Variable ....................

6-4

 

Displaying the Table...............................

6-5

Chapter 7:

Getting Started: Shading a Graph....................

7-2

Draw Operations

DRAW DRAW Menu ...............................

7-3

 

Drawing Lines ....................................

7-4

 

Drawing Horizontal and Vertical Lines ...............

7-5

 

Drawing a Function ...............................

7-6

 

Shading Areas on a Graph ..........................

7-7

 

Drawing Points ...................................

7-10

 

Clearing a Drawing ................................

7-12

Chapter 8:

Getting Started: Generating a Sequence ..............

8-2

Lists

About Lists.......................................

8-3

 

LIST OPS Operations ..............................

8-6

 

LIST MATH Operations ............................

8-9

Chapter 9:

 

 

Statistics

Getting Started: Building Height and City Size.........

9-2

 

Setting Up a Statistical Analysis.....................

9-8

 

The STAT List Editor ..............................

9-9

 

Viewing, Entering, and Editing Lists .................

9-10

 

Sorting and Clearing Lists ..........................

9-13

 

Statistical Analysis ................................

9-14

 

Types of Statistical Analysis ........................

9-15

 

Statistical Variables ...............................

9-17

 

Statistical Plotting ................................

9-18

 

Statistical Analysis in a Program ....................

9-22

 

Statistical Plotting in a Program.....................

9-23

Introduction v

Chapter 10:

Getting Started: Rolling a Die .......................

10-2

Programming

About TI-80 Programs .............................

10-4

 

Creating and Executing Programs ...................

10-5

 

Editing Programs .................................

10-6

 

PRGM CTL (Control) Instructions...................

10-7

 

PRGM I/O (Input/Output) Instructions...............

10-11

 

Calling Other Programs ............................

10-14

Chapter 11:

Probability Experiments: Coins, Dice, and Spinners ...

11-2

Applications

The Unit Circle and Trigonometric Curves............

11-3

 

Program: Newton’s Numerical Solve Routine .........

11-4

 

Program: Numerical Integration.....................

11-6

 

Program: Window Variables Store and Recall .........

11-8

 

Graphing the Inverse of a Function ..................

11-10

 

Graphing a Piecewise Function .....................

11-12

 

Graphing Inequalities ..............................

11-14

 

Graphing a Polar Equation .........................

11-15

 

Program: Guess the Coefficients ....................

11-16

Chapter 12:

Checking Available Memory ........................

12-2

Memory

Deleting Items from Memory .......................

12-3

Management

Resetting the TI-80 ................................

12-4

vi Introduction

Appendix A:

Table of TI-80Functions and Instructions............

A-2

Tables and

Menu Map........................................

A-20

Reference

TI-80 Variables ...................................

A-26

Information

 

 

Appendix B:

Battery Information ...............................

B-2

Service and

Accuracy Information .............................

B-8

Warranty

In Case of Difficulty ...............................

B-10

Information

Service and Support Information ...................

B-14

 

Warranty Information..............................

B-15

Index

Introduction vii