DragonUser23_Mar85.pdf

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March 1985
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1. 1111I MMI I I MI I MI NI MMEI MME
Quantity
Please make chequesTP.O. payable to Salamander Software
Name
Address
1
Total a. enclosed
E Please send me your full colour catalogue.
Salamander Software Discount Club
17 Norfolk Road, Brighton, East Sussex. BN1 3AA
1 1 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • = m o m m o m o m i l l
111
1
1
6
Telephone number
C
(All departments)
,
01-437 4343
A
Editor
BRENDON GORE
Production Editor
BARBORA HAJEK
Software Editor
GRAHAM TAYLOR
Editorial Secretary
GERALDINE SMYTH
Group Advertisement Manager
DAVID LAKE
Advertisement Manager
SIMON LANGSTON
Administration
THERESA LACY
Contents
Letters
5
Sequential files
7
Manic Min e r query. a change o f mo d e .
back issues and an Edit command tip
-4k•-•
SU SH E
N IN
2 2
Robin Hamilton explains h o w to create a
200K database on tape using sequential
file techniques
News
The latest information on new software for
the Dragon plus news of a bulletin board
service for Dragon 64 owners
Interrupt printing
2 6
J ohn Na s h rev eals s o me of t he my s t eries
of the interrupt routine and h o w it can be
used for printing
Flight Simulators 1 0
Brian Cadge compares two flight simu la -
tors a n d d isco ve rs that landing i s mo re
difficult than taking off
Open File
2
3
8
5
Readers' programs this month include
Dragonsoft
1
1
Adventure trail
John Scriven takes a look at some of the
latest g a me s o n o ffe r, in clu d in g S p e e d
Racer and Draconian from Microdeal
Mike Gerrard provides hints and tips on a
range o f adventures including an incredi-
ble shrinking scientist
Managing Editor
DUNCAN SCOT
Publishing Director
JENNY IRELAND
Subscriptions
Expansion system 1 3
Hywel Francis examines Race Electronics
new expansion system
Bookbytes
3
7
Arcade games and introductions to co m-
puters f o r n o vice s fe a tu re a mo n g t h is
month's selection
Mastermind
14 D r a g o n Answers
3 9
UK DO for 12 issues
Overseas (surface) El 6 for 12 issues
ISSN 0265-0177. Telex : 296275
Dragon User, 12. 13 Little Newport Street,
London WC2H 7PP
US address: c o Business Press
International. 205 East 42nd St, New York.
NY 10017
Xavier Devreker presents a computerised
version of the popular board game — our
program of the month
Another batch of timely advice from Brian
Cadge, plus a routine to unplug the DOS
cartridge using software
Doodling
John S m i t h p re s e n t s a s i mp l e
graphics type program for drawing on the
Dragon's hi-res screen
1
t u
8
le
rt
Competition corner 4 2
Win 1 5 co p ie s o f Wo rld s o f Flig h t fro m
Microdeal in this month's competition from
Gordon Lee (Front cover by Mike Berend)
1ABC
Published by Suns hine Books, Scot Press
Ltd_ (C) Sunshine Books 1985
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
SlN9. 01-274 8611. Telex: 261643
Registered at t he Pos t Of fi c e as a news -
paper
Dragon a n d i t s l o g o a r e t rademark s o f
Dragon Data Ltd
Editorial
When the Dragon was first launched, one of the most common queries
was nothing to do with the operating system or machine code, it had to do
with the whereabouts of the mushroom in Madness and the Minotaur.
Some of the earliest independent Dragon software houses were also
heavily adventure biased, notably Salamander Software, creator of the
inscrutable Dan Diamond.
FOR SOME REASON there is a remarkable affinity between Dragon
owners and adventure games. Many of the recent game releases have
been adventure orientated. Incentive ha s recently converted its K e t
Trilogy to the Dragon, while both Adventure International and Channel 8
have also released adventures. Now Compusense has launched a version
of the classic Colossal Cave.
This is not to say that Dragon owners are not interested in arcade
games or more serious applications. There are as many standard shoot
'em up games for the Dragon as there are for most micros. Manic Miner,
Grid Runner and Lazer Zone have all been converted to the Dragon.
However, t he adventure market still seems t o have a n irresistible
attraction for Dragon owners. Wintersoft's Ring of Darkness and Return of
the Ring have built up a dedicated band of followers, as has Dragon Data's
El Diablero.
Given the depressed state of the Dragon market generally, it is nice to
know that there are some areas which are still relatively buoyant. Happy
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
ser for publication should not be more than
words long. All submissions should be
ped. Pleas e leav e wi d e margins a n d a
ubie space between each line_ Programs
ould, whenev er pos s ible, b e c omput er
•nted on plain white paper and be accom-
nied by a tape of the program
We c annot guarant ee t o ret urn ev ery
bmitted article or program, so please keep
copy. I f you want t o hav e y our program
turned y o u mu s t inc lude a s t amped.
dressed envelope,
adventuring!
March 1985 Dragon User 3
A change
of mode
l e t t e r s
T h i s
screen-dump p ro g ra m in t h e
i
s
September 1984 issu e wo rks
t
h
e
perfectly on the Mannesmann
c
h
G L E D lo n g t o three dimensions in a F o r
HAVING S TRUG
Tally " S P I RI T-8 0
and hard with Dragondos ran- N e x t loop.
p
and r i
- p hasnproved very useful to
t e r
A Stein
dom access data tiles perhaps
me!
a
t o o ,
readers would be interested in
48 Suffolk Road
John Harrington
a
the two accompanying p ro g -
Seven Kings
8 West View
n
rams th a t, wh e n ru n . lo a d ,
Ilford
Northgate
g
Essex
store and retrieve an array up
Morpeth
c
' TWO RROGRAMES TO LORD..STOFE! R E T R I E V E ARRAYS
Northumberland NE61 3BT
10
e
20 ' NO DI MENSI ON CAH BE LARGER THAN 1 0
e
't , THERE CANNOT B E MOPE THAN 3 DI MEMSI ONS
t
40 I F THEY WERE THE STORE PROGRAM WOULD ACCEPT
D
50 ' THEM BUT THE RETPI EVE PROGRAM WOULD NOT
o
-7
70 r_tC
:
r
O DI T X ( 4 . 5 . 6 )
C OM
'
[
F
O
R
EXAMPLE]
DURING T H E p a st mo n t h I
90 CREATE"DATAFI LE". 130 4 * 5 4 : 6 4 - 1 0 B T E S 3
a
R
i
have been abroad and, a s a
100 FOR nr-1 TO 4
r
E
consequence, missed the De-
110 FOP 8 =1 TO t ;
120 FOP C r
cember issue of Dragon User.
r
P
130 I
, RNPUT X ( A , B , C ' E T O LOAD WI TH A FO12. fl ET LOOP]
My l o c a l n e w s a g e n t h a s
o
r t . 1 0 8pmp14 F. R' [ P L B Y TE LENGTH-EP-B7TE POSTI ON]
140 T O
1
already se n t b a ck h is unsold
ti21 CWRI TE"DATAFI LE", FROM D r , r 0 P
y
O
6
copies. I s t h e re a n y w a y I
C
n
G
170 R
NE:".T B
could p u rc h a s e t h i s issu e .
o
AHCXT n
u
either f ro m th e publishers o r
u
'PROGRAM TO p E TRTr v r DA I A FI L E
some 'back issue' company?
10 M
G While
T
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CL5
202 Cutenhoe Road
s
IPRIHT
v
NAME"; 11
40 NPUT"A
Luton
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I NRUTue NOME": P
50
Beds LU1 3NJ
60 I MPUT"C HAME". r.
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70 B P .
Back issues o f the maga-
r
'EXPLANATI OM O F VARI ABLE CP A S WE
zin e a r e a v a i l a b l e d i r e c t
80
,
20• '•A L L THE
w
E X C F P T THE ONE OH EXTREME RI GHT
e
••
from us. Simply send £1.25
(
100 ' APE ALWAYS - 1
per copy t o Dragon User,
i
• : ' THE MULTI PLES STARTI NG A T THE L E FT APE At wAYS
2
110
Back Issu es, 12- 13 Little
A
120
s
- ' THE DI MS ON THE RI CHT MUTI PLI ED TOGETHER, l c
Newport St reet , L o n d o n
12'0 ' I N THI S CASE Q - 5 t 6 B . 6 AS ONLY 1 D I M PCMAI HS
1
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TWO DI M APPP•Y'.', APE DNI E THE S RA
WC2H 7IDP_
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w A N E>•:AMPLE O F 5 . . 6 > MULE) B E
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170
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120 FP E n n " b r-i
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PP INT" FINSWEP " •1
200
-
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10 Gob ° 3 0
:
2
WITH R E F E R E N C E t o R
r8 F I L E "
i
. ( A
t
E t
Hadekel's le t t e r i n D ra g o n
- F
C
n
User Se p te mb e r t h e re i s a
might be able to get Out of the
-
t
P e t i
simple solution to his problem.
lower-case text mode by using
This i s t o u s e t h e P CL E A R
a poke fro m within th e p ro g -
d
F
O
ra m, r a t h e r t h a n t h e
subroutine lo ca t e d i n R O M ,
i
R
a v o id in g t h e c h e c k f o r
e
HAVE recently purchased a
y
1
PCLEAR O.
keyboard. C a n y o u t e ll m e
S
game called Ma n ic Miner. Is it
N
O
.
whether th is i s possible a n d
If the following line is added
H
possible to obtain a co d e t o
o
:
how I might do it?
to the beginning of a program,
I
enable me to h a ve a s ma n y
it will cause the removal of all
n
e
lives and screens as possible,
F By t h e wa y, y o u m a y b e
high-res pages with the loss of
,
interested to know that lob o ap
as one can on th e Co mmo d -
u
T
G wyn n 's m a c h i n e c o d e
variables, but not the program
9
ore 64 and Spectrum?
w
+
Robert Williams
,
r
O
12 Esplen Avenue
C
P
t
Crosby
"
p
Liverpool L23 2SS
f
i
S o f t w a r e Projects
r 1 ( 5 ) Ma n ic Min e r
o
S h a r d s
o
2 ( – ) Mystery of the Java Star
p
O
c
e
a
n
m
3 ( 1 ) Hunchback
d
O
a
s
i
s
t
4 ( 3 ) Dragon Chess
s
5 ( 2 ) Chuckle Egg
A
&F
h
6 ( 7 ) Sprite Magic
K n i g h t Software
I
,
A M putting together a ve ry
e
7 (10) Bug Diver
M a s t e r t r o n i c
simple program on the Dragon
s
8 ( – ) Cuthbert goes Walkab o u t __ ............ Microdeal
32 wh ich will e n a b le m e t o
c
9 ( – ) Ring of Darkness W i n t e r s o f t
produce letters, re p o rt s a n d
t
10 ( – ) Da ta b a se
M
S
T
such like via a printer.
o
One problem I have a t the
Chart compiled by Websters Software
r
moment is figuring out h o w I
m
e
e
Load, store and retrieve
(le a s w i t h t h e n o r m a l
FCLEAR). But, beware, high-
res co mma n d s a re n o t d is -
abled and, i f th e y a re used.
the b a sic p ro g ra m w i l l v e ry
likely be corrupted:
Back issues
on demand
A$= CHRS(&H96)+ CHRS(&
HBC)+ CHRS(&HC6)+CHRS
(&H01)+ CHRS(&H1F)+ CHR
$( &H 02) + CHRS( &H7E) +
CHRS(&HAA)+CHRS) ( & H
35).4= VARPTR ( AS) :A= PE
EK (A+ 2) * 256+ PEEK(A– 3)
EXEC A
F Carl ottt
Hope Point House
Kingsdown
Deal
Ken!
Mystery
functions
DRAGON D A T A i s n o t t h e
only culprit in failing to provide
complete d o cu me n ta tio n i n
computer so ftwa re ma n u a ls.
Other u s e rs o f 6 8 0 9 b a se d
machines and Microsoft Basic
seem t o fi n d o missio n s a n d
errors on a regular basis. I d
like to pass on a recent " fi n d '
by Alan Farmer, as reported in
the Re a d e r's F o ru m o f t h e
September 1984 issue of Ho t
CoCo. T h e " My s t e ry F u n c -
tions in the E DI T Command'
that h e found in h is TRS -8 0
colour computer work perfect-
ly well in the Dragon.
Three sin g le ke y functions
are described: A , (:), a n d E .
used while the computer is in
edit mo d e . A i s p a rticu la rly
helpful to hackers like myse lf
who manage to me ss u p the
corrections while in EDIT, and
then w i s h t h a t t h e y c o u l d
erase t h e " co rre ct io n s
- a n vd r wit h o u t le a v in g
start o e
EDIT_ A single stroke on the A
key does just that.
0 i s f o r t h e p e rso n w h o
realises that he is editing the
wrong line, o r that the original
was really correct. 0 not only
erases t h e editing, b u t a lso
exits the EDIT mode.
E a llo ws y o u t o e x it t h e
EDIT mo d e immediately with-
out displaying th e balance o f
the edited line. A min o r time-
saver. One important item that
wasn't mentioned, if you are in
Insert mode within EDIT, then
the le tte rs A , 0 , a n d E a re
simply inserted into the prog-
ram l i n e y o u a r e e d it in g .
Simple
solution
Infinite
lives poke?
Software Top 10
tlarry C Taylor 1
1
Kiriat-Ono
Israel
March 1985 Dragon User 5
Zgłoś jeśli naruszono regulamin