AcornUser007-Feb83.pdf

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Machine code answers
3D Atom graphics
1 MHz bus details
Dynamic procedures
£80 printer reviewed
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THE RH ELECTRONICS
I
Place the pen gentlyon the
screen and a new world presents
itself. You can draw on your TV
screen. Just like you would on
for BBC Model A users.)Valid
Price £37 (inc. VAT, p&p)
for BBC Model B Microcomputer.
paper but with the added excite
ment and flexibility of using an
electronic light pen.
You can construct shapes, lines
and with the software packssoon
to be available, you'll be able to
create a host of effects, which will
inputs are indicated by an LED at
the end of the penwhich only
responds to the light pulses from a
TVor monitor screen.The pen
sensors are sheathed in a
Makecheque or PO payableto
RH Electronics Limited,
allowing28 daysfor delivery.
professional quality case and react
practically instantly (200nS).
Supplied with a machine codedrive
routine and four basic programmes,
R H Electronics Limited
Chesterton Mill, French's Road,
Cambridge CB4 3NP
you have the flexibility to select
the mode most suited to your
work.
Telephone (0223) 354455
all spring to life in glorious colour.
Simply plug the interface board
into the analogue inputsocketof
the BBC Model B Microcomputer.
You'll find RH Electronics' light
Approved by Acorn Computers
for the BBC Microcomputer,
Model B.
pen pure inspiration. It'll bring out
the artist in you.
(We can supplyfitting instructions
CONTENTS
ACORN
USER
FEBRUARY 1983, NUMBER SEVEN
Editor
2
3
Editorial
News
56 Reviews
Wordwise firmware and
Acornsoft's
Rocket Raid
Tony Quinn
Editorial Assistant
Kitty Milne
6
8
User groups
58 Reviews
Managing Editor
Jane Fransella
Production
Susie Home
BBC update
Amber 2400 - the £70 printer
60 Letters
11 Machine code programming
John Ferguson and Tony Shaw
Marketing Manager
Paul Thompson
show you where to put it all
19 Hints and tips
Teletext, discs, EPROMs,
to name a few topics
63 Dealer list
Promotion Manager
Pat Bitton
Publisher
Joe Telford gets dynamic, and
adds a note of warning
24 Beeb forum
Stanley Malcolm
Designers and Typesetters
GMGraphics, Harrow Hill
Graphic Designer
Phil Kanssen
Printed in Great Britain
Ian Birnbaum assesses your
programming tips
29 Micros in schools
by E.T.Heron & Co. Ltd
Advertising Agents
Dealer Deals Ltd.
Charles Bake gives his
ideas for primary teachers
37 1
MHz bus
Paul Beverley probes the
secrets of Fred. Jim and Sheila
43 Atom BBC board
20 Orange Street
London WC2H 7ED
01-930 1612
Distributed to the News Trade
Is it worth the money?
by Magnum Distribution Ltd.
72-8 Fleet Street,
London EC4Y 1 HY.
Tel: 01-583 0961
Barry Pickles takes a look
47 Atom
error
handling
Telex: 893340 Magnum G.
Published by
Addison-Wesley Publishers Ltd.
53 Bedford Square.
London WC1 B 3DZ
Tony Armitstead has his own
way to do it
49 3D graphics on an Atom
Wire frame drawing and
rotation by Philip Tubb
54 Competition
Simon Dally sets you thinking
about routing
How to submit articles
Cover design by Chris Gilbert.
Pictures Irom opening lilies to
Telephone: 01-631 1636
Telex: 881 1948
ISSN: 201-17002 7
-''Addison-Wesley
Publishers Ltd 1983
BBC TV series - page 8
Subscription Information
For UK Subscriptions, send
your cheque or postal order
made payable to Addison-
Wesley Publishers Ltd to:
MAGSUB (Subscription Services)
Ltd, Ground Floor Post Room
Oaklield House
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.
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 WC1 B 3DZ.
Coming soon in
Acorn User:
• Software reviews • Beeb hardware ideas • Guide to printers • Games
listings • BBC telesoftware launch • Atom utility boards • Programming in
primary schools • Music on the Beeb • Language ROMs from Acornsoft •
All nghls reserved. No pari ol Ihis publicalion may be reproduced without prior written permission ol ihepublisher.The publisher
cannot accept any responsibility lor errors in articles, programs or advertisements published. The opinions expressed on the
Perrymount Road
Haywards Heath
West Sussex RH16 3DH
Annual subscription rates
UK
£15
Europe
£18
Middle East
£20
The Americas and Africa
£22
Rest of the World
£24
pages ot this lournal are those ol the authors and do not necessarily represent those ol the publisher. Acorn Computers Ltd or
Acornsolt Ltd
Acorn. Acornsolt. and the Acorn symbol are the registered trademarks ol Acorn Computers Ltd and Acornsolt Ltd.
EDITORIAL
THE RIGHTS AND WRONGS
WE DID it again last issue. We upset people at
Acorn with the magazine. It happens every issue,
and they have a moan and we have a moan back.
This time it was the programmers. They've
gone through all the trouble of providing a useful
compiler in the Beeb, and articles in
Acorn User
tell people to do it another way.
Their real beef is that this gets people into
bad habits. If you play around with machine code
and move things around in memory through any
other method other than that described in the
In a perfect world no one would have a GOTO out
of a PROC, but many people - especially those
with no formal training-will do exactly this. And,
after all, it is at these people that the BBC's
Computer Literacy Project is aimed.
So in future we'll probably tell you the article
doesn't do things'right'. The program will run, but
it is unlikely to work on machines which use the
Tube or have the other expansions the Beeb is (or
will be) famed for.
User Guide,
you can mess things up when your
machine is expanded.
Hence, programs written with these 'bad
habits' will not run once the Tube is fitted or you
start using second processors. But, as always,
the decision is with you, if you want to do things
wrong, then you will do.
The same goes for programming techniques.
Anotherthing to remember isthat many of the
articles are written by users, not experts. Their
techniques won't be perfect, but their ideas are
good and worth being seen. The article may also
just be a clue to something which needs
developing.
Anyway, thanks for the feedback. If you don't
like something say so-and suggest a better way
if you can.
PROFESSIONAL
ADVENTURERS
TO UNDERTAKE
THREE DANGEROUS
MISSIONS
You will need a quick agile mind, a rock-steady hand, and nerves of steel to
survive. Your reward will be treasure beyond the dreams of man and the
satisfaction of going where no man has gone before.
Special
fCompetition1
with over
/CG'.lNSiFT GAMES
Castle of Riddles
PHILOSOPHER'S QUEST
/(CORNSSFTGAMES
A fascinating
Philosopher's
Quest
All the adventures can be run on
adventure in a world of
£3,000
in prizes.
CASTLE OF
RIDDLES
fiendish puzzles to be
solved. Tocomplete
your quest—think hard
the BBC Microcomputer Model B and
cost £9.95 including post and
packing.
Acornsoft Limited c/o Vector Marketing Ltd, Denington
Industrial Estate, Wellingborough, Northants NN8 2RL.
To: Acornsolt Limited c/o Vector Marketing Ltd, Denington
Industrial Estate Wellingborough, Northants NN8 2RL.
Please send me the following adventure games.
Philosophers Quest SBGO1... (qty) at £9.95 =
Sphinx Adventure
SBG07... (qty) at £9.95 =
SBG17... (qty) at £9.95 =
Castle of Riddles
Total.
v
about everything you
•/WORNSSFT GAMES
"I
do.
Win over £3,000 in prizes
in the fabulous Acornsoft/
Your Computer competition.
Entry form on every pack.
Enter the warlock's castle,
solve the riddles, and regain
the ring to become 'King of
the Ring!
SphinxAdventure
SPHINX
ADVENTURE
A full-sized classic
I enclose cheque no
or please debit
adventure game in
which you move
through caves, fight
with trolls, collect
treasure and finally make your way to
my Access or Barclaycard no
Please Print
Name:
the sphinx to collect your re^arr.
j SignaUi
ACORN USER FEBRUARY
NEWS
The artier side of Acornsoft
TRAVELLERS on London's
Underground system might
have been surprised to
see Acornsoft's name as
sponsors of an art exhi
bition.
cover
of
September's
Acorn User
to a piece of
tapestry.
Victoria, who has done
portraits
for
President
Hussein
of
Iraq
and
President Stevens of Sierre
the exhibition in a month.
The
from
portraits
the
Queen
range
and
to
a
appears there is a history
in Acorn of sponsoring the
arts.
Queen
Mrs
Mother,
De Lorean
through
The 34 wax oil pastel
portraits on the theme of
'women
in
the
news'
replaced the
vertising on
normal ad
the down
escalator at Bank station.
Artist Victoria Preston
specialises
in
tapestry
portraits which, said Acorn
soft director David Johnson-
Davies, is a tech-nique
allied to computer graph
ics. If you don't believe
him, compare the front
Leone, booked the adver
tising space herself for
£800, and then sought
sponsorship.
She saw it as taking art
to the
people, and a
welcome change from the
usual static way of pre
senting art at exhibitions.
In fact, a spokesman
for London Transport esti
mated that up to a million
people could have seen
pensioner who was recently
mugged. We've shown the
'nice'
picture
of
Mrs
Thatcher, but there was
also
one
showing
her
darker side.
Chris Curry, joint man
aging director of Acorn,
once backed a harpsicord
player at the Wigmore
Hall.
Rumour also
has
it
that a Cambridge choir
has approached him for
financial support.
The
head
of
London
All of the portraits were
based on news photo
graphs of the people they
depict.
The
exhibition
was, unfortunately, due to
end in January.
David
Johnson-Davies
Transport's
advertising
department Joe Putnam is
always ready to look at
new ideas for the Tubes.
was keeping quiet about
the whole idea, but it
So
if
you
think your
graphics might qualify as
computer-generated
art,
give him a ring.
Four views of women: the nice side of Mrs Thatcher, Mrs Walesa, Mother Theresa and Billy Jean King
Courses and
addresses
•
Artificial Intelligence and
Education is the theme of
a
conference to
be
held at
Be a computer sport
THE editors of
a
book on
Exeter University on April
16-17.
Seymour Papert (as in
Logo) will be there and
tutorials
Details
will
be
held
on
microcomputers
in
sport
are looking for specimen
programs which demonstrate
the use of computers in
sport, recreation and physical
education. If any readers
have written, or are prepared
to write suitable progams
and
would
like
to
submit
as soon as possible to: Dr
David Brodie, School of
Physical
Education
and
Recreation,
University
of
Liverpool, PO Box 147,
Liverpool L69 3BX.
The editors are interested
in both simple and complex
programs. Every one selected
for inclusion in the book will
have
full
author
acknow-
ledgement in the text and
frontispiece.
Dr Brodie recently set up
a sports injuries clinic which
is
used by students at
Liverpool
University.
His
department is a leader in
the field of 'sports medicine',
and
the
treatment
of
soft
Prolog and Logo.
from
Masoud
them for publication, write
tissue injuries. Hugh Jones,
winner of last year's London
Marathon
was
a
recent
Yazdani, Computer Science,
Exeter University, Physics
Building, Stocker Rd, Exeter
EX4 4QL Tel: (0392) 77911
ext. 216.
patient.
In honour of Gulnik
THE computer business
spawns a new addition to
our society's slang just
about every week.
After
v idiot
(a video
game junkie), a new name
has surfaced, this time
from the Acorn waterworks.
•
December's
Acorn
User
It's
gulnik,
and
for
is
an
com
missed out the address of
•
Bristol
University
is
running
several
courses
using BBC micros. Contact
0. Wilde or Mrs. L. Skinner,
Extramural
studies,
32
Tyndalls Park Rd, Bristol
BS8 1HR. Tel: (0272) 241 61
affection
term
puter show groupies.
It is mouthed in honour
Bridge Software who make
Bridgeman.
The cassette
costs £7.90 from 36 Fern-
of a chap who is always
popping up wherever Acorn
exhibitions
found.
are
to
be
wood, Marple Bridge, Stock
port SK6 5BE. That'll teach
them to put their address on
cassettes!
Fame at last!
ACORN USER FEBRUARY

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