MasteringMachineCodeOnYourZXSpectrum.pdf

MASTERING

MACHINE CODE

ON YOUR

ZX SPECTRUM

by Toni Baker

with illustrations by Cathy Lowe

First published in the UK by:

Interface Publications,

9-11 Kensington High Street,

London W8 5NP.

AII rights reserved. This book may not be reproduced in part or in whole

without the explicit prior written permission of the publishers. The

routines outlined in this book may not be used as part of any program

offered for publication nor for programs intended to be sold as software,

except as allowed by the publisher. Permission must be sought, in

advance, for all applications of this material beyond private use by the

purchaser of this volume.

ISBN 0 907563 23 6

Cover Illustrator, Stuart Hughes

Typeset and Printed in England by Commercial Colour Press,

London E7.

Further information on Spectrum Machine Code may be obtained from

the ZX Machine Code Users Club.

Toni Baker

37 Stratford Road

Wolverton,

Milton Keynes,

MK12 5LW

CONTENTS

CHAPTER ONE – INTRODUCTION

A brief summary of the book.

CHAPTER TWO – INTRODUCTION TO HEXADECIMAL AND

MACHINE CODE

Computers count in sixteens not tens. The system is called

hexadecimal and this chapter will help you to get to know it.

CHAPTER THREE – SIMPLE ARITHMETIC

“ Simple” means very simple! Plusses and takes only. Shares and

timeses are left till later!

CHAPTER FOUR – PEEKING AND POKEING AND MORE ABOUT

An explanation of how to use memory in RAM.

CHAPTER FIVE – STACKING AND JUMPING

How to use the stack to store data. Jumping and conditional jumping is

explained, and the use of subroutines explained.

CHAPTER SIX – TAKING BYTES TO BITS

Or how to count on your thumbs. This is called binary, and reveals the

innermost secrets of how computers count!

CHAPTER SEVEN – PRINTING THINGS TO THE SCREEN

In BASIC the PRINT statement is one of the most widely used of all.

Here's how to use it in machine code.

CHAPTER EIGHT – A DICTIONARY OF MACHINE CODE

AII the instructions. A complete explanation of every single machine

language instruction used by the Spectrum.

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