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Full text of "ZX Mushroom Club Newsletter (February 1988)"

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. ~ ^ ,.,..„. ..,.■■ nun -30774. 

jj)~zx mushroom cluET 




Sinclair 

ZXSPECTRUM*2 



ll 50FTWAFS i-N *!*!! 




The omeino ZX Spectrum +2 has ■ DuPI+> detaeotiJaf - to rave you 
Ihe bother of tape recorders and leads. The advanced 1 28K memory 
helpi you get the most horn the vast universe of gemoa available. 

Every model cornea complelo with six tree games to start 
you off. and a Iree joystick to mane you super agile. 

With the advanced Sinclair technology you can afford to let 
your imagination go wild. Because at 1144a only your enemies pay 
heavily. 

Compare these prices and see what a good deal 
you are B atttngi- 

neBOSSMMM Price R6B9.00 

I.E. 'a Normal Price 589.00 

SPECIAL PRICE 449.00 



Knight Ore 


32 


W 


Nabulus 




:'.' 


Ball breaker 
Road Runner 


29 


" 


Hubble Bobble 

Pride of the Federation 


29 
27 


99 

99 


Kyateris 
High Frontier 


29 
36 


99 




29 


99 


Wl snail 






ErHJ 


36 
39 
117 


* 


hi-oft Basic 


52 

52 


00 


720° 

Planter Pilot 


36 


S 


Tomahawk 


38 


50 


T^undercsta 


36 


50 


Scruples 


36 
36 


w 


Tibet 








29 




c'L^Br'ida.e 


4S 


m 




36 


n 




36 


HM 


Gaunt'let IT 


76 


n 



I IS THE ITEM 



ONLY 10 IN STOCK 








. NO CATCHES - 






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re "no 


-atch" apeci 1 


WE ttad 






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If they are able 


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«nt t 


M ke a special deal fo 




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FIRST 


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Good hay7 Well our 


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at ion? Quite 
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w=Q TO 7:PHINT AT 10,10;CHRS p 

10 PRINT AT w,5/ , " , :PAt!SE 0:IF INKEYJ' 

THEN INPUT a:POKE qlw.a: PRINT AT I 



in Graphics, bul 



IF INKEYI = ChBI THEN L 
NEXT q 



i p 32 THEN LET p = P 



: SAVE a$ CODE 



3 



•■*.*•*«■»••*■*. THIS PROGRAMME RESULTED FORM READING -FORTUNE 
SECRETS' BY URI GELLER AND "HInDS UITHOUT BOUNDARIES" BY STUART 
HOLROYD. AFTER THIS OVERDOSE OF MYSTICISM IT UAS INEVITABLE THAT I 
SHOULD TRY THE MENTAL EQUIVALENT OF SPDON BENDING ON THE QL5 UITH SOME 
SURPRISING RESULTS I BIGHT ADO. 

IT UAS THE CHAPTER IN THE HOLROYD BOOK ON ZENER CARDS THAT ACTED AS 
THE TRIGGER. THESE CARDS UERE DESIGNED BY A CERTAIN DR ZENER. CIRCA 
me, TO PROVIDE NEUTRAL IMAGES FOR RESEARCHERS TO CONCENTRATE UPON. 
THEY COMPRISED A CIRCLE. A STAR. A PLUS SIGN. UAVEY LINES AND A SQUARE 
ANDIT HAO BEEN MY INTENTION TO DUPLICATE THESE SYMBOLS ON THE OL. BUT 
IN HY HASTE TO GET INSTANT RESULTS FOR THIS PROGRAMME I HAVE MERELY 
USED THE NUMBERS ONE TO FIVE. 

THE ZENER CARDS UERE INTENDED TO BE USED BY TUO PERSONS TO SEHDl 
TELEPATHIC MESSAGES TO EACH OTHER. BUT IT UAS AT THIS POINT THAT I 
PICKED UP THE GELLER BOOK AND READ THAT, ACCORDING TO HIM. THE HUMAN 
MIND COULD NOT ONLY INFLUENCE OTHER PERSONS BUT IT COULD INFLUENCE 
INANIMATE OBJECTS AS UELL. APPARENTLY DURING A BBC TV PROGRAMME, IW 
UHICH GELLER HAD BEEN THE GUEST, HALF THE UATCHES IN THE UK STOPPED, 
UHILE JUST AS MYSTERIOUSLY AN EQUAL NUMBER STARTED. SO AOOPTING THE 
PHILOSOPHY THAT UHAT IS GOOD ENOUGH FOR LONDON IS GOOD ENOUGH FOR 
JOHANNESBURG I UROTE THE FQLLOU1NG PROGRAMME IN UHICH YOU ATTEMP 
INFLUENCE YOUR Ql_. 

IN-PRINCIPLE TEN NUMBERS. BETUEEN ONE TO FIVE. ARE GENERATED 

RANDOM ORDER AT LINE 1248. YOU ARE THEN INVITED TO GUESS THESE NUMBERS 

AT LINE *32B. OBVIOUSLY YOU CANNOT GUESS A NUMBER UNLESS THE Ql IS' 5 a ba: 

THINKING ABOUT IT AND THIS T ACHIEVE BY PRINTING THE NUMBER UITH BLUE otl -5 

INK ON A Bl UE SCREFN- SO THAT THF RESULT IS INVISABLE. [LINE 2828 AND « 1 ui t a 

LINE 4188). kSizz 

UHEN YOU HftVE KEYED IN THE PROGRAMME AND YOU SIT IN FRONT OF YOUR PSI J £i£§ 
TESTER YOU UILL BE PRESENTED UITH TUO UINDOUS, UHICH CHANGE COLOUR AI uj K I j a 
INTERVALS TO MAINTAIN INTEREST. THE LEFT HAND UINOOU UILL APPEAR BLANK c £ u £i 
BUT ONLY BECAUSE THE INK AND PAPER ARE THE SAME COLOUR. UHILE THE § = " *■ 
RIGHT HAND UINOOU WILL CONTINUOUSLY ROTATE THE NUMBERS ONE TO FIVE ALL ujuuo 
THE UHILE YOU HOLD THE SPACE KEY. UHEN YOU THINK YOU NAVE FORMED A J n£« 
SUITABLE TELEPATHIC BOND UITH YOUR OL HIT (ENTER) AND IOU UILL IE'" u 
OFFERED THE NEXT HIDDEN NUMBER . m Kg 

■ MADE TEN SELECTIONS YOUR CHOICES UILL BE ANALYSED (LINE ggg 1 -^ 
, HELPFUL MESSAGES DISPLAYED. AFTER THREE HUNDRED SUCH GJ, g « 
SELECTIONS YOUR PSI POUER RATING MAY BE DISPLAYED CLINE 2*80), BUT TE = 2 
ONLY IF YOU HAVE ONE. urn u _i 

BUT HOU DOES IT UORK? I HEAR YOU CRY. UELL AS THERE ARE FIVE £2£ Q g 
SELECTIONS THERE IS A TUENTY PERCENT CHANCE THAT YOU UILL RICK ANY Kjjj-H 

^ven'mSmIer "there are actually ten choices » »«J uquljcxpect. W s BS s 5 
tmf aufraof Tn SCORE TUICE. IF YOU DO SCORE AT THIS. AVERAGE. RAIL SaUHU 
THE RRERIrSSe UILL INDICATE AS "UCH ILINE 222HJ. HOUEVER IF YOU | i . g j 
MMMnUlSlI " K « FOUR IHE» YOU UILL REIN CLOSE RENTAL » „ J i 
CONTACT UITH YOUR OL «ND IT UILL ONLY BE A NATTER OF TINE BEFORE T 
OUIET NEN IN THE LONG UNITE COATS CORE W TAKE YOU AUAY. 




Hr *hl 

ISISTANTLY i^3„2 



•UT BEFORE THEY DO OUST CONSIDER THIS. I TRIED IT AND CONSISTS, 

SCORED ICLOU AVERAGE. NOU SCORING BELOU RUERAGE IS OUST AS INTERESTINE K IX 

ASSOTI* MOVE? SO I CONSULTED THE "BINDS UITHOUT BOUNDARIES" BOOK S = 3 p. ^uS 
AND REM THAT OR GERTRUDE SCHHEIOLER OF THE CITY UNIVERSITY OF NEU =!5"VBE" 
T»« HAO DISCOVEBED THIS FACT IN <?«•. SHE FOUND THAT THOSE •• "|„ ,!;.= 
SlJEUeri "I ESR tKTRA SENSORY PERCEPTION] SCORED ABOVE AVERAGE AND | ! S ; i S T * 
KosTSo OID^OT BELIEVE SCORED BELOU. SHE CALLED THEH SHEEP ANO -J » J 5 J 2 2 
eflRTSt THAT'S THE BIT I DIDN'T LIKE. =££fe£££S 



10B REMARK 37 12B0 »»**»»«•«»«*•*»*» 

118 REMARK INHHHMM PSI TESTER »*»««« 

120 REMARK »•«••»»«••»»»• »«»•• »■•«••» 

130 REMARK * THIS PROGRAMME « 

140 REMARK I ATTEMPTS TO » 

159 REMARK « INVESTIGATE YOUR PSI > 

168 REMARK * POUER BY INVITING YOU ■ 

170 REMARK • TO GUESS RANDOMLY • 

180 REMARK • GENERATED NUMBERS. THE ■> 

190 REMARK * PROGRAMME INDICATES " 

200 REMARK - YOUR SCORE • t 

210 REMARK »«„•■«•»»■■»■•»«*•»»»•»»» 
220 : 
230 : 
240 : 
758 INIT 
PAR HEADING 

m nu"Sf-repeats^num-of-repeats2* <0 

29B GENERATE 

308 COLOUR 

310 FOR NM=1 TO 10 

320 DISPLAY 

338 IF NM>9iBEEP 0,10.100.5008.8 

340 GUESS 

3S0 NEXT NH 

36B ANALYSE 



1360 OIGITX-1 

1370 REPEAT GUESS'LOOP 

13B8 CLSn*:CURSORO4,30. <! 

13?fl PAUSE:IF KEYROUCU = 

1400 DIGITI-DIGITXHsIF I 



PRINTB4.DIGITX 
EXIT GUESS'LOOP 
GITZ>5:DIG1T1"1 



USE AHD LEARN 



370 PRINT'FESULT 



-OF-REPEATSZ>300: PRIZE: 
INT-RESULT:EXIT L 



370 MORE 

480 IF- EFLAGXi 

410 END REPEAT LOUP 

420 CL0SEH3:CL0SEn* 

438 PAUSE: BEEP: STOP 

440 : 

458 : 

440 I 

18B0 DEFINE PROCEDURE INIT 

1010 PAPER SiBORDER 4. 7 :CLS:CLSBB 

1028 0PENH3.SCR - 512X256ABXB 

1030 0PEN04,SCR-512X2S6ABX9 

1848 UIND0UB3. 108. SB. 120.70 

10S0 B0RDERB3.4.8 

106H UINOOUBi, 10B. 58- 270.78 

1870 BORDERU4.4.0 

1B90 CSI2EB4.3, 1 

1890 CSIZEB3.3, 1 

110B DIM NUMXt 103 

1118 DIM NUM-GUESSXt «0) 

1128 DIM SC0RE2C31 

113B TOTALX-0.WUM-OF"REPEATSI-0.AWX-B.ME 

1140 END DEFINE 

1150 : 

1140 ■ 

1170 i 

1188 DEFINE PROCEDURE DISPLAY 

1198 CURSORUS.SO.^PRmTaa.NUMZ 

1208 END DEFINE 

(210 I 

1220 : 

1240 DEFINE PROCEDURE BENERATI 

12SB FOR «1-1 TO 10 

1268 NUnXCNTIJ-RNDM TO S) 

1270 NEXT NM 

1288 END DEFINE 

1290 ■ 

taea i 

1310 i 

1320 DEFINE PROCEDURE GUESS 

1330 BEEP 999,108 

4348 AT <2.0 

1350 PRINT' HOLD SPACE 




'AGHEATA3SET 

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OUT OF 5PECTT1UM BASIC" ...VERY HIGHLY 

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THE ART STUDIO VS I'HE ARTIST II 
ho OCF' Art Studio and the. Artist II by Sof technics are the two 

eceived the acol lade of being a Sinclair user S itmr Cl***ic 

ind both give the user complete control over the Spectrum 

IYOUT 



Dn both programs the top few lines of the screen are dominatei) 
by menu bars. These menus can be pulled down over your work to 
reveal a number of options which can then be higlighted and 
used. This sytem of pull down menus works eiitreemly well and 
efficiently and contributes greatly to the overall success of 
the systems. On the All the bottom rows of the screen have a 
number of icons which are used for various functions which 1 
will explain later. 

HANDELINE OF SCREEN CURSOR/PP INTER 

The AS and All are both completely cursor reliant. Both 
programs' pointer can be controlled by use of keyboard, kemspton 
Joystick or mouse. When using the AI I , the keyboard 

controls can not be re-defined. The AS cursor is Intelligent 
whereby ..its speed is increased the longer the movement keys are 
nrpssed. 1 found the All icon cursor to move at a much slower 
than the pointer of AS. I felt this was a big drawback to 



Eace than the pointer of 
he speed of the program 



CULUUR ATTRIBUTES 






| those already on the screen. The AS can only select 

- options by the menu labelled "ATRIBUTES", but the A 

E chose these attributes in a number of ways. Firstly you c 

w the "MODES" pull down menu as like AS, but one can also 



8 



| DRAHiNia of pre-defined shapes 

The AS wins hands down with the drawing of pre-defined shapes. 
% The All can , by selecting the appropriate icon , draw 1 ines, 

rectangles (again can be drawn filled) The AS can also draw 
those shapes (excluding the eclipe-eB) with the inclusion of 
triangles and rays. Another feature that the AS has, is that an 
•'elastic'" option c*n be highlighted, which, when drawing 
circles, rectangles etc, stretches the shape as the Joystick is 
moved ie: instead of ploting the centre dot for the circle and 
then the radius, this option allows you to plot the centre and 
strech and contract the circle until the required shape is 
reached.' I found this to be a very helpful antra when accurate 




ttjilJ blessing. This facility remove the la*t pr^dure don* by the 
SPuifT (except on the AS after magnify mode has^been^uced . >^ The 

"V^ MALSN1FYIHE "J 

/N-jFor those detailed drawing or reaving O* tiny blemishes to your 

HUrt work this option is very powerful, in the mag mode pixels 

7-rPtcaii be placed and removed at great accuracy and this can real!/ 
UV polish up your work (Also it is interesting to see what a colour 
Hi cTash loo k. 8 times its normal size.. In the AS three stages of 
] magnification can be optained, 2m, 4x and Bx normal size. The 
-=_ latter produces a portion of the screen at a s.ze where the 

I pixels are represented largly. In the AS the entire screen i» 

I— removed and the enlarged version of your drawing is shown, 5- 

Pl one must return to the main screen in order to check the true 

ILjHJsiite and nature of your work. Ttio All divides the screen in two 

1 El in mag mode, showing the enlarged work on one side and the true 

1 Pp.iw on the other. This is much easier to work with PUT only Oh* 

5ff magnification size is available, which makes detaUed wurk more 
S[ difficult to obtain. 



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MACHINE. CODE 



Machine Code Tape Header Reader 

Mb SOFTWARE PROJECTS 

One o( the least explored and certainly most fascinating, areas of our 
favourite machine is the ROM. It contains an Incredible number of 
routines Just watting to make your machine code programming easier. 

The particular routines I am going to use here now are some that we 
have all used In our time, from BASIC, yet probably without even 
wondering about what else we could do with them. They are: 

1) The ROM tape header reader 

2) The ROM restart routine for printing to screen 

Every time you use the BASIC commands "LOADVSAVEVMERGE" or VERIF 
the routine at ROM address #0556h Is run to read the header Information 
being sent from the cassette. By simply changing the starting 
information ( PARAMETERS ) in the registers used by the routine we 
can then place the heeder data where we want it, to manipulate from 
machine code or even BASIC ! 

Let me demonstrate: 

I like to describes my machine code routines in the following wey: 

ENTRY CONDITIONS: l.e what must be In which registers and what 
: locations before the routine may run. 
: e.g HL» Start , BC= counter , etc. 

EXIT CONDITIONS: l.e what will be in which registers and what 
: locations after the routine Is run. 
: e.g HL- end+1 , BC- aero , etc 

REGISTERS USED: Merely a (1st of all registers used by the 
: routine, so that you can save them on the 
: stack or elsewhere In memory If you do not 
: want them overwritten 
: e.g AF, BC. E, H, IX , etc 

I will be using this standard throughout my program and supporting 
notes. I heve also assumed that you can get your hends on a good 
Assembler program (I'm sure I.E would oblige to sell you one of the 
superb programs on the market!) If not, a BASIC routine to ellow 
entry of the HEX CODE Is supplied after the listing. 

Also, read up on the "RANDOMISE USR" expression to RUN any machm 
code you may have entered. 







-> 



THE ROM HEADER READER ROUTINE: 



ENTRY CONDITIONS: IX = start of free area In RAM 

: DE = Number of bytes to read from tape (17 normally) 



EXIT CONDITIONS: "DE" number of bytes will be read from the tape 
header Into memory locations starting from "IX". 

REGISTERS USED: Assume all.(AF. BC, DE. HL, IX, IY & alternates) 

.. and this is the actual routine 

COMMENT 



free area = 290OO 

No of bytes to reat 
zero to accumulatoi 
SET carry flag 

all bytes read ? 



HEX CODE 


ASSEM 


LER HhiEH 




ORG 


29092 


DD214B71 


READ LD 


IX, 29000 


DDES 


PUSH 


IX 


111100 


LD 


EE.17 


AF 


XOR 


A 


37 


SCF 




CD560S 


CALL 


#0556 


DDE1 


POT 


IX 


30EE 


JR 


NC.HEAD 



Another well-used ROM routine is one of the print routines. It 
Is called a RESTART routine and will print the CHARACTER in the 
A-register (ACCUMULATOR). 

But remember, garbage in - garbage out ! Do not try to print a 
character that is not between ASCII 32 and 164.(Check the back of 
the Spectrum Handbook). You're liable to Just get something wrong 
H your values are incorrect because EVERY character can sometimes 
have a special or implied meaning I 

Let's have a look at a simple working routine, which, although not 
not part of thB actual tape header reader, shows what I've 
described. 



RET < END. 

Now DON'T PANIC I. The character "A" was certainly printed on the 
screen, but probably In the bottom section, and eo the BASIC 
message "0:1 OK" has overwritten It 1 If you use the "PAUSE" 
expression you could hold the character on screen long enough to 
read before the BASIC program to run the machine code ends. 
But this is not the only alternative. The best method would be 

to load the System Variable TV_FLAG (23612) with zero before running ^ 

the program, and this way the printing will all take place in the / 

upper part of the screen. This is how " do this in machine code: 



ASSEMBLER MNEMONIC 
XOH A 



This routine would preceed the previous routine to print the "A" 
at the top of the 'page', and is the second part of our cassette 
header reader program. 



v and write an easy routine to 



Let us advance a step further r 
clear the screen display area. 

ENTRY CONDITIONS: None needed (The routine sets them up ttself) 

EXIT CONDITIONS: Take a guess I (One cleared screen .of coursel) 

REGISTERS USED: HL. BC, A 



HEX CODE 




ASSEMBLER MNEMONIC 


COMMENT 


210040 




LD 


HL, 16384 


Start of screen area 


01001B 




LD 


BC.6144 


No. of bytes in area 


AF 


CLS 


JiOR 


A 


Set A-reg to zero 


n 




LD 


(HL),A 


overwrite byte on scree 


23 




INC 


HL 


point to next byte 


OB 




DEC 


BC 


decrement counter 


79 




LD 


A,B 


Method used to check if 


Bl 




OR 


C 


BC = 


::oFf.= 




JR 


HZ, CLS 


If not then carry on. . . 



This routine does not actually do any more than ]ust overwrite all 
the dots on the screen, that is, it ignores the colours of the PAPER 
and INK In the attributes area, but it is sufficient for our needs. 




Expecting 
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in ». 




■■ at 


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DID YOU KNOW? 



iiahop sent us this Information on ARC0N01D 
over 2S000 and when you get onto the high 
-e table type in your name as PBRAIN. A 
lag* will than sppear telling yon to push 
:a to cheat. You will appear on the last 
:1 you played on and you will also get all 



AUF UIEDEK5EHEN MONTY 
CLEAR32767 : L0AD""CODE 
RANDOMISE USH 32799 

QUESTIONS 



rnis w»Uoh S*vF./L0M> 



2S floppies for only R4B5 
plus lC cartridges only H 



] 92159 work, (0431) 



ub could help 



: M. .. . ..„.„ „, «„, ci„b c.,i, 



Ettiene Mybfrgri f 



9 



. MEMBER REF i 



To: INFORMATION ENTERPRISES. PO Boa 35644, Menlo Park. 0102 



DESCRIPTION 



$tt*Mttttt**$$*ttttti$»t$$tttttt*tutttuttt>t*t**t*ttttt*tt»ttf**t***t*t> 



R . 

R . 

R .__ 

R . 

R ._•! 



HOW TO ORDER.. 



'S 



EZ\ 



KZ 



PO BOX 3 
Menlo Pa 



to 



it TEl^t 

7 



piJ5Tft<i£ AND PACKAGING 



SUBTOTAL: R_ 

POSTAGE: R_ 

TOTAL: R_. 



ADVICE CN 
EQUIPMENT A 
SOFTWARE 

n 



(012) 46 B226 



"KZ s 



PO BOX 35644 



HARDWARE 








Disc Drive (single 


fi.90 
7.00 


9.00 

11.50 






3.45 


5.75 


A4 Printer 




10.00 










5.90 






l.BO 


2.30 


Monitor (green 




B.00 
B.00 
8.00 


10. SO 

14.50 


Spectrum ♦ 
Spectrum . 2 




13.80 



STATIONARY 

Box of paper 120001 

Alphacom paper (1)