Machine_Language_for_the_Commodore_Revised_and_Expanded_Edition.pdf

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JIMBUTTERFIELD

MACHINELANGUAGE

FORTHE COMMODORE 64.128,AND

OTHER COMMODORE COMPUTERS

REVISED&EXPANDEDEDITION

STX $0381

■J

MACHINE

LANGUAGE

FOR THE

COMMODORE64,128,

and Other

Commodore

Computers

Jim Butterfield

A Brady Book

Published by Prentice Hall Press

New York, New York 10023

Machine Language for the Commodore 64,128, and Other

Commodore Computers

including the right of reproduction

in whole or in part in any form

A Brady Book

Published by Prentice Hall Press

A Division of Simon & Schuster, Inc.

Gulf + Western Building

One Gulf + Western Plaza

New York, New York 10023

PRENTICE HALL PRESS is a trademark of Simon & Schuster, Inc.

Manufactured in the United States of America

123456789 10

Library of Congress Cataloging in Publication Data

Butterfield, Jim

Machine language for the Commodore 64, 128, and

other Commodore computers

Includes index.

1. Commodore 64 (Computer)—Programming. 2. Commodore

computers—Programming. 3. Programming languages

(Electronic computers) I. Title.

QA76.8.C64B88 1986

001.64'2

84-6351

ISBN Q-

Contents

Note to Readers

vii

Preface

Introduction

xiii

1 First Concepts

The Inner Workings of Microcomputers

Memory Elements

Microprocessor Registers

Instruction Execution

First Program Project

Monitors: What They Are

The Machine Language Monitor

MLM Commands

Changing Memory Contents

Changing Registers

Entering the Program

Things You Have Learned

Detail: Program Execution

Questions and Projects

2 Controlling Output

Calling Machine Language Subroutines

CHROUT—The Output Subroutine

Why Not POKE?

A Print Project

Monitor Extensions

Checking: The Disassembler

Running the Program

Linking with BASIC

Loops

Things You Have Learned

Questions and Projects

iii

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