Advanced Spectrum Machine Language

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Practically the only branch of Spectrum programming not extensively
and comprehensIvely covered by a plethora of books is that of
advanced Spectrum machine language programming. With this book I
hope you remedy the situation
By 'advanced' programming I mean the type of top-level machine
language behind many of Ihe most successful Spectrum games.
Indeed, some of the techniques produced in this book are completely
orig inal and beyond anything seen in Spectrum games at the time of
writing. As an example,l cite the high-resolution coloor routines,and the
suite of routines which allows you to produce full screen pictures over
the border. Neither of these special effects has ever been seen in public
before. .
It is only fair to warn you that this book is not intended for beginners there
are plenty of good publications already available tor newcomers
to Spectrum machine language - and this book assumes a full
understanding of Z-80 instruction code righl from the start. This makes it
possible for me 10 take you to the very frontiers of state-of-the-art
Spectrum programming, extending them as we go. I hope you will enjoy
and benefit from the experience.
I would like to acknowledge the contributions of the following people:
• Mum and Dad. for eighteen years at immeasurable patience.
• My publisher. Fred Milgram. and all those at Melbourne House
Involved In the production work tor Ihis book,
• John, Deb, Brian. Dermot and Nobby for their support and
encouragement.
Finally, I dedicate this book to the six at clubs: and that's known as
dropping a good danker.
DAVID M. WEBB
Exeter College,
Oxford.
February, 1984.
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