Commodore_128_BASIC_Programming_Techniques.pdf

COVERS

COMMODORE

BASIC,

VERSION 7.0!

COMMODORE

128

BASIC

PROGRAMMING

TECHNIQUES

MARTIN HARDEE

TAB TAB BOOKS Inc.

Blue Ridge Summit, PA 17214

This book is dedicated to my mother, who will never understand computers;

to my father, who is trying; and to my wife, Jan, who routinely puts up with four or five in the house at one time.

Commodore, Commodore 64 and Commodore 128 are trademarks of Commodore Business Machines.

Apple is a trademark of Apple Computer, Inc.

IBM is a trademark of International Business Machines.

CPM + is a trademark of Digital Research, Inc.

FIRST EDITION

FIRST PRINTING

Printed in the United States,of America

Reproduction or publication of the content in any manner, without express

permissionofthepublisher, isprohibited. Noliabilityisassumedwith respectto

the use of the information herein.

Library of Congress Cataloging in Publication Data

Hardee, Martin.

Commodore 128 BASIC.

Includes index.

1. Commodore 128 (Computer)—Programming.

2. BASIC (Computer program language) I. Title.

QA76.8.C645H37 1986

005.265

86-14373

ISBN 0-8306-0432-4

ISBN 0-8306-2732-4 (pbk.)

Contents

Introduction

vii

1 A Refreshing Approach to BASIC

A Magician's Trade 1

A Walk Down Memory Lane 2

What Makes BASIC Different on the C-128 3

Using DO/UNTIL Instead of FOR .. . NEXT—Formatting Numbers—Inside a String

What's Ahead 5

2 What You Have to Work With

The Three Sides of the Computer 7

The 64 Side—The 128 Side—C-64/C-128 Compatibility—CP/M Plus

Commodore 128 Memory 9

What Memory and Power Mean to Programmers—Variable Memory—A Better Type of Memory

Graphic Sides of the Computer 11

The 40-Column Side—The 80-Column Side—Switching Between Modes

Editing Program on the Commodore 128 14

GraphicsSymbolsand Upper-and Lowercase Letters—EscapeCommands Used for Editing—How

to Makea Listing Pause—Splitting and Duplicating Program Lines—Clearingthe Screen from the

Keyboard—Changing Colors—Restoring the Screen

3 A Quick Tour of DOS Commands

Preparing Disks for Use 23

When to HEADER a Disk from BASIC—Entering the Header Command

Making Extra Copies 25

Seeing What's on a Disk: DIRECTORY or CATALOG 26

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