DragonUser21_Jan85.pdf

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The independent Dragon magazine
7 5 p U 8 3 . 2 5 J a n u a r y 1985
6809 show
highlights
Adventure
Blowing on
an Eprom
ARCADE
ACTION
RED MEANI ES
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PlePeLe make chequesrP.O. payable to Salamander Software
Name
Address
Total g enclosed
[ Pleas e send me your full colour catalogue_
111 2 • 11 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • i i
Salamander Software Discount Club
17 Norfolk Road, Brighton, East Sussex. BN1 3AA
Letters
Telephone number
(All departments)
01-437 4343
Editor
BREN DON GORE
Assistant Editor
GORDON ROSS
Software Editor
GRAHAM TAYLOR
Editorial Secretary
GERALDINE SMYTH
Group Advertisement Manager
DAVID LAKE
Advertisement Manager
SIMON LANGSTON
Administration
THERESA LACY
Managing Editor
DUNCAN SCOT
Publishing Director
JENNY IRELAND
Subs c ript ions
UK P O for 12 issues
Overseas (surface) £16 for 12 issues
ISSN 0265-0177. Telex: 296275
Dragon User, 1 2 13 Lit t le Newport Street.
London WC2H 7PP
US address. c o Business Press
International, 205 East 42nd St. New York.
NY 10017
$
King of the hill
2
3
Including this month information on key
functions, a plea from Incentive Software
and a special offer from Snip
Coilly Cobra and Splurge are out to get
you in P Thompson's O ben game — our
program of the month (Front cover by Mike
Berend)
News
8
Reach for recursion 3 1
Paul Grieves shows how to program in
recursion — a special ty pe of program
structure
Open file
A round-up of the 6809 show, details of
Premier's downfall and the latest on new
software and peripherals
3
3
Reader's programs this month include a
sound t o light listing, a short utility for
UltraDrive users, a stitching pattern and a
skiing game
Dragonsoft
1
1
1 5
Bookbytes
4
1
Our reviewers tackle the latest arcade,
educational, utility and graphics packages
Two basic books and an adventure game
guide are put under scrutiny
Bargain software
Adventure trail
4
3
Your last chance to obtain a selection of
games and adventures from Computer
Rentals at a reducad rate of C1.50 off for
readers of Dragon User
Mike Gerrard offers his help to adventurers
in need and tackles the latest adventure
from Channel 8
EPROM blowing
1 6
Dragon Answers
4 5
Keith and Steven Brian review the well-
designed EPR O M pr ogr ammer f r o m
Steve's Electronic Supply company
Brian Cadge offers adv ic e o n mov ing
DRAWed characters, saving graphics and
obtaining the start, end and exec locations
with the DragonDOS cartridge attached
ABC I
Published by Sunshine Books, Scot Press
Ltd. ©Sunshine Books 1984
Typesetting by Ches ham Press, Chesham,
Bucks. Printed by Eden Fis her (Southend)
Ltd, Southend-on-Sea. Essex
Distributed b y S . M. Dis t ribut ion, L o n d o n
SW9. 01-274 8611, Telex: 261643
Made in Spain
1
9
Gordon Ross interviews Eduardo Merigo,
president o f Eurohard SA, the Spanish
manufacturers of the Dragon
Competition corner S O
Cable Software offers the prizes to Gordon
Lee's puzzle
Editorial
IF THE 6809 show has any message at all, it is that the Dragon is not dead yet. Rumours
of the Dragon market's imminent demise, which have been rife since Dragon Data
folded, are somewhat exaggerated.
There was an excitement about the 6809 show not seen since the early ZX Micro! airs,
when the Central Hail at Westminister was filled with wall-to-wall people. Software and
books, admittedly on offer at discount prices, were shifting like there was no tomorrow.
But then many Dragon owners are worried that there will be no tomorrow.
Dragon's future has been the subject of considerable debate ever since Dragon Data
went into receivership and sold the manufacturing rights to the 32 and 64 to Spanish
company Eurohard. The pundits have been predicting a rapid end to the machine, with
software companies refusing to support a dwindling market.
Certainly the retail chains have emptied their shelves of Dragons and Dragon software
as fast as possible. Equally, those software companies specialising in the Dragon have
been converting their programs to other machines. Few of them are writing new Dragon
programs. Commodore, Sinclair, Acorn and Amstrad are the 'hot' machines now.
Nevertheless, the Dragon has undergone something of a mini-revival in recent weeks.
Stores anxious to rid themselves of unwanted machines have found cut-price Dragons
being snapped up by bargain hunters. Similarly, mail-order software houses have seen a
resurgence in business as Dragon owners discover they can no longer by software in
their local stores,
Perhaps the mos t encouraging news comes from Eurohard's plan t o s ell a n
enhanced 64 in the UK. Whatever the size of the existing Dragon user base, the machine
will only have a long-term future if it is followed by new models.
January 1985 Dragon User 3
paper
Registered a t t he Pos t Offi ce as a news -
Dragon a n d i t s l o g o a r e t rademark s o f
Dragon Data Ltd
How to submit articles
The quality of the material we can publish in
Dragon User each month will, to a very great
extent d e p e n d o n t h e q u a l i t y o f t h e
discoveries t hat y ou c an mak e wit h y our
Dragon. The Dragon computer was launched
on to the market with a powerful version of
Basic, but with very poor documentation.
Articles whic h are s ubmit t ed t o Dragon
User for publication should not be more than
3000 words long. All submissions should be
typed. Pleas e leav e wi d e margins a n d a
double space between each line. Programs
should, whenev er pos s ible. b e c omput er
printed on plain white paper and be accom-
panied by a tape of the program.
We c annot guarant ee t o ret urn ev ery
submitted article or program, so please keep
a copy. If y ou want t o hav e y our program
returned y o u mu s t inc lude a s t amped.
addressed envelope.
V'AJ
At last the saga
continues
The Guardian of Shedir
is defeated, the Hell
spawned hordes of the Evil
Sage lie at bay. Now
Ringbearer, wielder of the
Four Bright Rings, must
face the greatest
challenge: to return the
Ring Of Darkness to Its
creators on the hidden
planet Ringworid
And somewhere at the
ends of time the forces of
evil are preparing their
revenge.
After one year of
development, Wintersoft
are proud to present the
most sophisticated game
ever created for the
Dragon 32. Written 100% in
machine code, RETURN OF
THE RING is an astounding
multi program blend of
superb high resolution
colour graphics and
advanced routines that
allow you to communicate
with your computer in
complete sentences. You
will face challenge and
excitement as you and
your Ringworld
companions travel a
mysterious planet and
brave the dangers of an
amazing three-
dimensional forest moon.
An epic adventure
unrivalled for its wealth of
detail and diversity.
May luck travel your
path.
Please note: RETURN OF
THE RING is a complete
adventure. You need not
buy THE RING OF
DARKNESS to play it.
DEALERS PHONE
01-367 5720
ALSO AVAILABLE;-
DRAGON 32
Return of the Ring
The Ring of Darkness
Dragon Trek
SPECTRUM 418K
The Ring of Darkness
ornc -i 4811
The Ring of Darkness
Operation Gremlin
£
£
THE RING
OF
DARKNESS
PART II
£
£
£
9
6
£
6
9
9
9
.
.
.
.
9
9
.
.
9
9
5
5
9
9
5
5
5
5
30 UPLANDS PARK ROAD,
ENFIELD, MIDDLESEX,
EN2 MIT
PRICES INCLUDE P&P, VAT, AND OUR LIFETIME
GUARANTEE.
SELECTED TITLES AVAILABLE FROM
LARGER BRANCHES OF
Letters
Missing
manual
I PURCHASED a Dragon 3 2
secondhand and the previous
owner lost the instruction manu-
al. I f any reader has a spare
manual o r doesn't us e their
manual and would be willing to
part with it I'd be grateful if they
would get in contact with me.
B Elder
8 Longrove
Tie forest
Pontypridd
This is the chance to air your views — send your tips, compliments and complaints to Letters
Page, Dragon User, 12-13 Little Newport Street. London WC2H 7PP.
their home address and the Post
Office from which they obtained
their postal order, so that I can
clear up these orders and send off
copies of the game.
Darryl Still
Operations Manager
Incentive Software
54 London Street
Reading RG1 4S0
Function key routines
I WAS interested to read Peter
Whittaker's article on function key
routines in the October issue of
Dragon User. I have been ex-
perimenting with his method of
calling Basic ROM routines, and
found that for some routines at
least, it does not work. Inspection
of the ROM instructions at their
entry points shows why: these
routines need not the token, but
the next character after if to be
loaded into the A register. Also,
the CC register is unimportant
and does not need to be set with
ANDCC *SEE in the ones I have
tried. Below is a listing that calls
the ROM routines in sequence. To
execute type:
PMODE4: PCLS:SCREEN1,1:
CIRCLE(128, 96).95
The technique can also be used
with other languages. I use it to
call Basic functions from FORTH
as my MICROTANIC FIG NORTH
1.1 does not have Basic calls. but
does allow machine code calls
using JSR.
Dr John Nash
West Kirby
Merseyside
Twist or
stick
MANY THANKS for your review of
Cecil Plays 21; Having taken Brian
Cadge's comments very much to
heart we have immediately cor-
rected the faults.
As we have sold a number of
these tapes we do feel a responsi-
bility to our customers and would
like to inform them that anyone
who has a copy of Cecil Plays 21
can return it to us as we will, by
return of post, send out not only a
corrected v ers ion b u t als o
another one of our games by way
of compensation.
Howard Davies
Snip Software
PO Box 20
Woking
Surrey 6U21 30N
Smooth
operator
WITH reference t o the rotator
program by Neil Blagden in the
November issue of Dragon User
(Open file section) I would like to
improve on the program by mak-
ing the 3-0 graphics smoother.
Load or type in the program as
listed in November, and then type
in the following lines of program:
1PCLEAR 8: PMODE 4,5:PCLS
365 PMODE 4,5
465 FOR N=1 TO 4: PCOPYN-i-4
TO W; NEXT N
490 PMODE 4,5
595 PMODE 4,5
. P C L S
705 FOR N=1 TO 4: PCOPYN +
TO N: NEXT N
760 PMODE 4.5: PCLS
The program will now draw the
frame of the cube or triangle on
page five then copy it to page
one. The effect finishes the prog-
ram off well.
Leon Rees
Leicestershire
Scramble to
the rescue
I HAVE had several inquiries re-
garding my program Scramble,
Scramble published in the Octo-
ber issue of Dragon User. Most
problems are caused by incorrect
data entries in lines 2970-3130.
The program is correct as listed.
however, any readers having
problems can send me (co Dra-
gon User) a blank tape and a large
SAE for a free copy of the prog-
ram
Steve Gathercole
In search
of Trackers
W HAVE had a fantastic re-
E
sponse from readers to our offer
for Back Track using the E1.50 off
token published in the October
issue of Dragon User. However,
we have received some orders
that we are unable to send as all
we have received is a postal order
and the coupon with no name and
address.
Any readers who have sent a
postal order to Incentive and have
yet to receive their copy of Back
Track please either write to me at
the address below, or phone me
on 0734-591678 giving details of
7530 0 0 1 0 0 O R G 30000
7530 9E A6 0 0 1 1 0 START LOX SOA6
7532 34 10 0 0 1 2 0 P S H S X
7534 BE 7558 00130 L O X #TOK1
7537 9F A6 0 0 1 4 0 S T X S0A6
7539 AS B4 00150
LDA . X
7538 BD A9AF 00160
JSR SA9Al
753E 4F
00170
CLRA
753F BD ABC° 00180
JSR SA8C0
7542 8E 7550 00190
LDX itTOK2
7545 9F A6 00200
SIX SOA6
7547 AG 84 00210
LDA . X
7549 BD A9FE 00220
JSR SA9FE
754C 8E 7561 00230
LOX #TOK3
754F 9F A6 00240
STX SOA6
7551 AG 84 00250
LDA , X
7553 BD B238 00260
JSR $B238
7556 35 10 00270
PULSX
7558 9F AG 00280
SIX $OA6
755A 39
00290
RTS
755B 3 4 0 0 00300 TOK1 FOB $3400
7550 3 1 2 C 0 0 3 1 0 1
FOB $312C
755F 3 1 0 0 00320
FOB $3100
-
7561 2 8 3 1 00330 TOK3 FOB $2831
N2
7563 3 2 3 9 00340
FOB $3239
7565 2 C 3 9 00350
FOB $2G39
7567 3 6 2 9 00360
FOB $3629
7569 2 C 3 9 00370
FOB $2C39
FOB $3500
756B , 3500 00380
0000 00390
END
00000 TOTAL ERRORS
START 7530
TOK
1 755B
TOK2 7550
TOK3 7561
Software Top 10
1 ( 1) Hunchback
O
c
e
a
n
2 (3) Hungry Horace M e l b o u r n e House
3 (8) Dragon Chess
O
a
s
i
s
4 (2) Mystery of the Java Star
S h a r d s
5 (7) Chuckle Egg
A
&F
6 (4) M r Dig
M i c
r
o d e a l
7 (5) Cuthbert in Space
M i c r o d e a l
8 (6) Kr ieg spiel
B
e
y
o
n
d
9 (--) Bu g Diver
M a s t e r t r o n i c
10 (—) Spr ite Magic
K n i g h t
Software
Chart compiled by Websters Software
Bulletin
boards
CAN anybody provide me with
details of bulletin boards (either
free access or charged access)
suitable for use with the Dragon.
Also, any person interested in
setting up a bulletin board for the
Dragon in my area can contact me
at 8 Knights Hill, Severn Stoke.
Worcestershire.
D A Sutton
Worcs
January 1985 Dragon User 5

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