Understanding Atari Graphics.pdf

PLATE 1 Rotating colors in this mode-lO display of

Program 7 gives the illusion of motion.

PLATE 2 Delicate shadin g in this mode-9 display of

Program 8 creates a three-dimensional image.

PLATE 3 An entire spectrum of colors can be dis-

played simultaneously in the mode-ll Program 9.

UNDERSTANDING

ATARI

GRAPHICS

by Michael Boom

AN ALFRED HANDY GUIDE

Computer Series Editor:

George Ledin Jr.

List of Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

List of Plates and Figures . . . . . . . . . . . . . . . . . . . 4

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2. Basic Concepts and Terms . . . . . . . . . . . . . . . . 7

Atari Display Modes . .. . .. . . ..... . . . ..... 7

Pixels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8

Screen Address . . . . . . . . . . . . . . . . . . . . . . . . .. 9

Pixel Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Character Sets .... .... .. . ... . . .. . .. ... 11

Color Registers. . . . . . . . . . . . . . . . . . . . . . .. 11

The Cursor . .... . . .. . .. .. . .... . ........ . 13

3. Graphics Commands . . ............... ... . 14

Formatting Commands ....... .. .. .... . .. . 14

Graphics ... . . ..... . . .. . . ...... . . .. . ... 14

Setcolor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Color ..... .. ... .. . ... ... . .. ... .. ...... 17

Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Plot ..... . .... . .. . ..... . ... .. ... . .. . .. 18

Drawto . . ............ .. ... . ....... ... . 18

Position ...... . ... ... . . .. . . . . . .. . . . . . . 19

Print ... . . .. . .... . .... . .... .. .. . .. . . .. 19

Using Print in Text Modes . ....... . ..... 20

Using Print in Graphics Modes ....... . .. 22

Locate . .. . . . .. . .. .. . .. . . . ..... . .. . . . . 22

Put/Get .. ....... . . . .. . .. ... . ........ . 23

XIO . . ... .... .. . .... . .. ... .. . . . ....... 25

Command Summary ... . ...... .. .... . . . . .. 27

4. The GTIA Chip and Graphics

Modes 9,10, and 11 . . .......... . . . . .. . .. . 28

5. Tips and Tricks ... . ..... .. . . . . . ...... . ... 34

Appendix A: Display Mode Information . . . ... . 36

Text Modes .. .... .... .. .. . . . . .. ... . ..... 36

Graphics Modes ... . ..... . ... .. . .... . . . .. 38

Appendix B: ATASCII Code Chart .... ... . .... 41

L.J ~ SHERMAN OAKS, CA 91403

~ ALFRED PUBLISHING CO., INC.

This Handy Guide is not a publication of Atari and should

not be used in lieu of the instruction manuals that accompany

their products. All information regarding Atari graphics may

not be accurate or completely up to date.

Editorial Supervision: Joseph Cellini

Cover Design: Paula Bingham Goldstein

Production Management: Michael Bass & Associates

Printed in the United States of America.

or transmitted in any form or by any means, electronic or

mechanical, including photocopying, recording, or by any

information or retrieval system without written permission of

the publisher.

Alfred Publishing Co. ,Inc.

P .O. Box 5964

15335 Morrision Street

Sherman Oaks, CA 91413

Library of Congress Cataloging in Publication Data

Boom, Michael.

Understanding Atari graphics.

(An Alfred handy guide)

1. Atari computer-Programming. 2. Computer

graphics .

I. Title.

QA76 .8.A82B661982

001.64'43

82- 18463

ISBN 0-88284-224-2

LIST OF PROGRAMS

Program 1

Program 2

Program 3

Program 4

Program 5

Program 6

Program 7

Program 8

Program 9

Chapter 2, p. 8

Chapter 3, p. 16

Chapter 3, p. 18

Chapter 3, p. 24

Chapter 3, p. 26

Chapter 4, p. 28

Chapter 4, p. 31

Chapter 4, p. 32

Chapter 4, p. 33

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