SpectrumMachineCodeMadeEasyVolume2.pdf

•SPECTRUM

MACHINE CODE

•

MADE EASY

Volume Two

For Advanced Programmers

Paul Holmes

Spectrum Machine Code Made Easy

Volume Two – For Advanced Programmers

At last, the book you've been waiting for, to take you

through machine code on the Spectrum from first

principles. Contents include jumping; jumping relatively;

calling and returning; restarts; jumping with decisions;

flags; loops; double-height characters; ANDing; ORing;

XORing; looping with double byte registers; rotating and

shifting bytes; interrupts; the ROM interrupt routine; and

much more. Appendices include Z80 instructions and

mnemonics.

If you want to increase your knowledge of machine code

then this is the book for you.

Another great book from

INTERFACE PUBLICATIONS

SPECTRUM

MACHINE CODE

MADE EASY

Volume Two

For Advanced Programmers

Paul Holmes

I MTERFCE

PUBLICATIONS

Features

First published in the UK by:

Interface Publications,

9-11 Kensington High Street,

London W8 5NP.

Easy to understand step by step approach.

Lots of examples to try using the 'hands on' approach.

Dictionary of Z80 machine code.

A further look at system variables.

Printing double height characters.

How to make sound effects.

ROM routines including BEEP, character printing, etc.

Takes the reader from a basic knowledge to a full

understanding of the Z80 instruction set and the ZX Spectrum.

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 44 9

Cover Illustrator: Stuart Hughes

Typeset and Printed in England by Commercial Colour Press,

London E7.

Contents

Going places: Jumping, Jumping relatively.

Negatives. Hex loader program. Calling and

Returning. Restarts. Printing.

To go or not to go?: Jumping with decisions. Flags. 35

Calling with decisions. Returning with decisions,

loops. Comparing. Double height characters.

A chapter of bits: Setting and re-setting bits, testing 53

bits. Mini-word processor/Intelligent typewriter

program.

Logical Approach: ANDing, ORing, XORing,

looping with double byte registers.

Rotating: Rotating and shifting bytes. Decimals.

Ports: Making sound, changing the border. BEEP

routine.

May I interrupt?: Interrupts, the ROM interrupt

routine, interrupt routines.

Appendices

DECIMAL, HEX, ASCII CHARACTER SET,

109

Z80 MNEMONICS.

Z80 INSTRUCTIONS FLAG ADJUSTMENTS.

115

SYSTEM VARIABLES EXPLANATIONS.

121

DEFINITIONS OF ALL Z80 INSTRUCTIONS.

131

About the author

Paul Holmes, at the time of writing, was a seventeen year old

student who first started computing 3 years ago with a ZX80.

Since then he wrote two ZX81 software packages, toolkit and

graphics toolkit, that were marketed by JRS Software in the

UK and Softsync. in the US. He has for a period been a soft-

ware reviewer for ZX Computing and also wrote software for

Jupiter Cantab before their recent downfall. More recently he

has become the owner-manager of Timescape Software and

has published several of his own games, worked for Atari for a

small period, and has gained much praise from the technical

press about his games which reflect his excellent programming

and design experience.

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