AcornUser004-Nov82.pdf

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The Acorn Atom From E118 plus VAT.
Personal Computing-Instructional
and Fun
The Accessories-something for
everyone
The A t o m - t r i e d and tested
'lb get the best out of personal
computing you need two things-
hardware that is powerful and reliable
software that uses the hardware to
the full. The Atom range is lust that.
The Atom was designed to last -
inside and out. Outside a rugged, high
impact case with a proper keyboard.
Tested to withstand children as well as
adults. Inside a powerful operating
system that will never be bettered.
It is available in several versions so you
can choose what you want. And there
is an enormous range of additional
boards that fit inside the casing-start
where you like a d d more power,
more versatility when you need it.
Available Nationwide
Diskpaoks, printers, monitors,
plug-in ROM's, manuals, other
languages, arcade-type games,
business and household software.
Whatever you want to do teach your
children, run your business y o u can't
do better than choose the Atom range.
For full details of the
complete range and
a list of dealers just
fill in the coupon
or write to us.
FREE Catalogue
atittion
Thc Acorn At
I To Acorn Computers Ltd,
Fulbourn Road, Cherry Hinton,
Cambridge CBI LIIN Tel (0223) 245200
Please rush me a complete list of the
Atom range
Name
Address
Not just mail order, the Atom
range can be bought through a national
dealer network they will help and
advise you. And in the unlikely event of
breakdown they will be there. Like our
equipment Acorn Computers are
here to last.
CORNAuciebronuCtnonRiopatditecrshLeirmryited,
C O M P U T E R Hinton•Cambridge CBI 4IN
fel, (0223) 245200
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CONTENTS
ACORN
USER...,
NOVEMBER 1982, NUMBER FOUR
Editor
Tony Quinn
Managing Editor
Jane Fransella
Sub-editor
Ann N i m m o
Production
Susie Home
Marketing Manager
Paul Thompson
Promotion Manager
Pat Bitton
Editorial Secretary
Jane Lake
Publisher
Stanley Malcolm
Typesetters and
Designers
GM Graphics
Graphic Designer
Phil Kanssen
Printed in Great Britain
by E.T. Heron & Co. Ltd.
Editorial
01-631 1 6 3 6
Advertising Agents
Dealer Deals Ltd
20 Orange Street
London WC2H 7ED
01-930 1612
Published by
Addison-Wesley
Publishers Limited
53 Bedford Square
London WC1B 3DZ
Telephone: 01-631 1 6 3 6
Telex: 881 1 9 4 8
ISSN: 201-17002 7
'Addison-Wesley
Publishers Ltd 1982
2 Editorial
3 News
10 B B C update
David Allen on the new TV series
12 S i m p l e machine code
John Ferguson a n d Tony Shaw
lead t h e w a y
16 B e e b Forum
Ian Birnbaum tackles programming
problems
19 T r e k Ill
Star wars by Tim Heaton
26 S c h o o l s
Fishy graphics by Robin Norman
29 Graphics recipes
Windows, by teacher Jane Whitwell
32 M u l t i p l e program storage
Michael Murray has it taped
35 H i n t s and tips
Joe Telford speeds up graphics and
moves on to games
46 Printing on an Epson
George Hill's seven-tone dump
48 U s e r group news
51 A t o m graphics
Paul Beverley on manipulation
with machine code
56 Te x t manipulation
Peter Thomson is in control
58 D u m b terminal program
Beeb hint by Paul Beverley
60 Fireworks
Joe Telford lights the way
62 Concurrent picture storage
Peter Goode runs the show
64 Letters
66 S u b s c r i p t i o n o ff e r
68 W i n a BBC micro
Simon Daily sets the quiz
72 A c o r n dealer list
75 Readers' tips
76 F a m i l y favourites
Ronnie Rowsell's isn't a micro
Subscription information
For UK Subscriptions, send
your cheque or postal order
made payable to Addison-
Wesley Publishers Ltd to:
MAG SUB (Subscription Services)
Ltd, Ground Floor Post Room
Oaktield House
Perrymount Road
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West Sussex RHI 6 3 0 H
How to submit articles
You are welcome to submit articles to the Editor of Acorn User for publication. Acorn User
cannot undertake to return them unless a stamped addressed envelope is enclosed.
Articles should be typed or computer written. Black and white photographs or trans-
parencies are also appreciated. If submitting programs please send a cassette or disc.
Listings should not contain more than 39 characters per line for ease of reproduction.
Payment is £50 per page or pro rata. Please indicate if you have submitted your article
elsewhere. Send articles, reviews and information to: The Editor, Acorn User, 53 Bedford
Square, London WC1B 3DZ.
Coming soon in Acorn User:
• Sound on the Beeb • Software reviews • Atom word processing • Maths
in B a s i c • Programs f o r schools • Progress a t t h e B B C • Festive hints
and tips • Econet details • Listings for games • Teletext graphics
Cover design b y Chris G i l b e r t
Annual subscription rates
UK
E
1
5
Europe
1
8
Middle East
E
2
0
The Americas and Africa £ 2 2
Rest of the World £ 2 4
All rights reserved. No part of this publication may be reproduced without prior written permission of the publisher The publisher
cannot accept any responsibility for errors in articles, programs or advertisements published. The opinions expressed -on the
pages of this Journal are those of the authors and do not necessairly represent those of the publisher, Acorn Computers Ltd. or
Acornsolt Lid.
Acorn, Acornsoft, and the Acorn symbol are the registered trademarks of Acorn Computers L t d a n d Acomsoft Ltd.
'ACORN
Constructive
approach to
the problems
of computing
C O M P U T E R t r ' . " , " , : : , ; 7 7 „ ' ; ' , " , ; ! t : : „ 0 , , . CarnbnagaC e t r e r e p h o n • 0223 245200 t a l k s 817825 ACORN
Pear Readers
,ertware House.
..'i%'-'a=:'t.e.TntrZtitIgh:I'lt:st=d:f7c..oer'n-T=7:di=g4tZegC
n i e r o e u m p O t e r, S y s t e m , L o r n A t o m , E c 9 n e t a n d m a t e r i a l s f r o m a e o r n s o r t , o u r
e have e n t r u s t e d t h e p u b l i s h i o g o r t h i s magazine t o Addison-Wesley. who. w i t h
t h e i r r e p u t a t i o n i n computer p u b l i s h i n g , s h o u l d b r i n g t o I t a u t h o r i t a t i v e
comment r e cd ia r t i a l t rs lo n balanced v l e w. a c t i v i t y . T h e magazine w i l l n o t b e
readers a n e v e c e u y microcomputer
l i m i t e d b y Acorn e i t h e r e d i t o r i a l l y o r i n t h e a d v e r t i s i n g c o n t e n t . t o ensure
fisewhere I n t h i s i s s u e t h e r e a d e r w i l l f i n d c u r r e n t i n f o r m a t i o n on t h e
a h l a i y t f h n c i l developments.
of vt a iea lb i tl ets t o e ce x i is tan g and new equipment a n d s o f t w a r e , i n a d d i t t o n t o d e t a i l s
of s e a i t u l l
Pours rrv i c ef and yUpgrading f a c i l i t i e s . I n l e t u r e i s s u e s you w i l l b e kept a p p r a i s e d
ACORN COMPUTERS Ill)
H M Hauser
C J Curry
Joint Managing b i r e c t o r s
TO THOSE of you who have never seen a copy
of A c o r n U s e r b e f o r e - w e l c o m e . Y o u a r e
reading t h e o n l y m a g a z i n e f o r u s e r s o f t h e
Atom, B B C m i c r o c o m p u t e r s a n d E c o n e t
systems which has official support from Acorn
Computers.
Acorn U s e r i s r e l a t i v e l y n e w - i t w a s
launched in July - and this is the first issue to
be distributed nationwide. I t s r o l e i s t o h e l p
you s q u e e z e t h e b e s t f r o m y o u r m i c r o (and
help you get one), as well as providing news of
the latest developments from Acorn, t h e B B C
and any other sources which are relevant.
The word 'users' is meant in its widest sense
as readers c o m e from all worlds - education,
business, industry, home - and many countries.
So w h a t e v e r y o u r interest, t h e r e s h o u l d b e
something here, if not let us know.
Commentators in the media have had a field
day with t h e i r criticism o f Acorn - much o f i t
deserved. B u t this magazine aims to provide a
constructive s i d e t o i t s criticisms. F e e d b a c k
presented i n a proper way is valuable both t o
writer and target.
This effect is appearing in Acorn's attitude to
its n e w, m a s s m a r k e t m i c r o c o m p u t e r - t h e
Electron. H o p e s o f a Christmas launch h a v e
now b e e n d a s h e d , a n d t h e c o m p a n y i s
delaying t h e l a u n c h t o a v o i d p r o d u c t i o n
2
difficulties which bedevilled the BBC machine.
Anyway, l e s s o f all t h i s theory a n d b a c k t o
the interesting b i t s . D a v i d A l l e n i s providing
this month's article from the BBC on progress
with t h e n e w T V s e r i e s . B u t m a k i n g
programmes, j u s t l i k e building micros i s all i n
the production, a n d serious filming w o n ' t start
till early November.
Meanwhile, o n e o f A u n t i e ' s offshoots, t h e
Ceefax s e r v i c e , i s p r e p a r i n g t o l a u n c h
telesoftware. B u y i n g a r e c e i v e r w i l l e n a b l e
computer u s e r s t o d o w n l o a d p r o g r a m s
broadcast o v e r t h e airwaves directly i n t o t h e
memory o f their machines, a n d save them o n
cassette or disc. Imagine it, n o more keying in!
Prestel has also set up a computer database to
provide a s i m i l a r service, w i t h t h e m i g h t o f
Buzby's British Telecom.
On t h e educational front, teachers a r e still
faced with a dearth of software. As BBC micros
spread t h r o u g h s c h o o l s f i n a n c e d b y t h e
Government's m i c r o e l e c t r o n i c s s c h e m e , t h e
need f o r d e c e n t programs w i l l b e c o m e m o r e
apparent. A c o r n U s e r h o p e s t o r e m e d y t h e
situation b y acting a s a medium f o r ideas and
printing listings.
That's all from the Editor for now, see you in
December.
ACORN USER NOVEMBER
a l = 1111 . 11 . 1 . 1111 . 11 . 11 . 11 = 11
• MCMLXXXII Wall Disney Productions w o r l d rights reserved
Acorn-Disney link up
British company joins forces
with US film giant in schools competition
IRON, t h e s c i e n c e f i c t i o n
adventure film, is the found-
ation o f a m a j o r l i n k u p
between A c o r n C o m p u t e r s
and A m e r i c a n e n t e r t a i n -
ment g i a n t W a l t D i s n e y
Productions.
A competition b a s e d o n
the film h a s been produced
for primary a n d s e c o n d a r y
schools i n B r i t a i n - w i t h
BBC m i c r o s a s t h e m a j o r
prizes.
Acorn are offering a BBC
microcomputer w i t h d i s c
drive, p r i n t e r a n d s o f t w a r e
as first prize. T h e r e will b e
further a w a r d s g i v e n f o r
regional entries.
But e n t r a n t s n e e d n o t
already h a v e a c o m p u t e r.
All primary children need to
do i s d e s c r i b e t h e p l o t i n
100 sentences of 1 0 words
or l e s s , w h i l e s e c o n d a r y
pupils m u s t w r i t e a s t o r y
based o n Tron laid o u t l i k e
a computer program.
Details a r e n o w b e i n g
sent to schools.
At the risk of giving i t all
away, t h e s t o r y t e l l s h o w
Flynn, a programmer, h a s
ACORN USER NOVEMBER
his video games stolen by a
powerful c o m p u t e r c o m -
pany. In his attempts to find
proof o f t h e theft, F l y n n i s
drawn into a computer.
This f a n t a s t i c electronic
world i s controlled b y t h e
Master C o m p u t e r P r o -
grammer, w h o s e n t e n c e s
Flynn to death by combat in
the v e r y v i d e o g a m e s h e
wrote in the outside world.
However, a mighty video
warrior called 'Tron' c o m e s
to h i s a i d i n t h e b a t t l e
against the MCP.
Much of the action takes
place o n l i g h t c y c l e s ,
shown b e l o w. T h e s e l e a v e
a wall o f energy behind
them, w h i c h t h e riders u s e
to t r y t o t r a p t h e i r
opponents. T h e m a c h i n e s
travel a t b l i n d i n g s p e e d s ,
and c o l l i s i o n w i t h o n e o f
these e n e r g y w a l l s m e a n s
death.
Tron l a s t s o v e r 1 0 0
minutes, a n d m a k e s exten-
sive u s e o f c o m p u t e r
graphics. Disney spent over
$20 million making t h e film
- a quarter of this on the 15
minutes of wholly computer-
generated sequences.
Unlike S t a r Wars, w h i c h
used m o d e l s a n d m o v i n g
cameras t o c r e a t e b a t t l e
scenes, T r o n u s e s c o m -
puters - w i t h s p e c t a c u l a r
results. A s t h e f i l m ' s
director o f s p e c i a l e f f e c t s
said r e c e n t l y : ' I t r e m i n d s
you o f something you have
never seen before.'
• MCMLXXXII Wall Disney Produclions w o r l d righ•-•
nd
Computer-drawn light cycles play a deadly game
3

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