Atari XL Manuel utilisateur

THE

ATARIXL

HANDBOOK

THE

ATARIXL

HANDBOOK

PETER

LUPTON

&FRAZER ROBINSON

CENTURY

COMMUNICATIONS

LONDON

Peter

Lupton

and

Frazer

Robinson

1984

All

rights

reserved

First

published

Great

Britain

1984

Century

Communications

Ltd,

12 - 13

Greek

Street,

London

5LE

ISBN

7126

02259

Reproduced,

printed

and

bound

in Great

Britain

Hazell Watson &Viney Limited,

Member

the

BPCC

Group,

Aylesbury,

Bucks

Typeset

Spokesman,

Bracknell

CONTENTS

Acknowledgements

Introduction

Computers

and

Programs

Setting

your

XL 3

First

Steps

Programming

Program

Control

Data

and

Programs

Pieces

Strings

Functions

Logical

Thinking

Memory

Managemen

t74

Sound

and

Music

Characters

105

Graphics

136

Advanced

Graphics

153

Player-Missile

Graphics

172

Permanent

Storage

188

Advanced

Techniques

196

APPENDICES

BASIC

Commands

204

BASIC

Error

Codes

Speeding

Programs

umbering

Systems

Graphics

Modes

Colour

Codes

Character

Codes

Display

List

Instructions

Useful

Memory

Locations

Music

Frequencies

Musical

Notation

System

Memory

Map

Index

215

223

225

230

231

232

234

236

238

239

243

244

ACKNOWLEDGEMENTS

Our

thanks

all

those

who

some

way

made

the

creation

this

book

possible,

especially

friends

and

colleagues

whose

enthusiasm

and

interest

was

invaluable

our

stocks

midnight

oil

burnt

low.

Special

thanks

Herbert

for

all

his

contributions,

and

Richard

Gollner

for

his

continuing

optimism

and

sense

humour.

Once

again

our

families

have

given

much

encouragement,

for

which

are

grateful,

and

sound

nutritional

advice,

which

have

ignored.

INTRODUCTION

This

book

introduction

the

ATARI

range

computers

and

their

facilities.

takes

you

from

the

first

steps

BASIC

programming,

pointing

out

the

pitfalls

and

explaining

how

make

the

most

the

features

ATARI

BASIC,

through

to a

detailed

understanding

how

write

good,

structured

programs,

with

many

illustrative

examples

along

the

way.

chapter

devoted

the

extensive

sound

capabilities

the

XL,

including

details

the

sound

generating

chip

itself

which

allow

you

create

wider

range

of effects

than

is possible

using

the

standard

commands.

Four

chapters

cover

the

incredible

graphics

facilities

the

machines,

including

many

spectacular

examples

and

useful

programs.

advanced

chapter

shows

how

detailed

knowledge

the

way

graphics

are

created

leads

even

exciting

effects.

comprehensive

set

appendices

ensure

that

the

book

will

remain

valuable

reference

work

long

after

you

have

grasped

the

principles

the

machine.

hope

that

you

will

find

this

book

both

enjoyable

and

instructive

and

that

enables

you

exploit

the

potential

your

XL to

the

full.

PETER

LUPTON

and

FRAZER

ROBINSON

1984

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