Amiga Computing - Commodore Is Awesome

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VISAGE e NA 1='Li 1 - IE F t 3.413%111 F-110.111 HARD DRIVES VZ: WESTERN DIGITAL 3,3" 1/11211. 421IN111 540%113 IA GIG 1.2 GIG a D S e a g HITACHI 2.5" IDE " " . " (249.99 1110111 04999 1.2 tali - - a ; ( A500/A600 1 t RAM 1 A500 1e2MB NI(Clock . E 1 9 99 4500 112MB WiClo ck 1 E 2 4 9 9 e 2 A500. 1 M B E 2 9 99 - A600 1MB NiClock 6 E 2 9 99 A500 1MB W(Clock 1 E 3 9 99 . . MITSUMI . MOO . Internal ICIE CDROM . unit 101 the A4000 (requires Tandem . CDROM controller) Super-fast 600KbSec transfer rate FX400 CDROM E 1 4 9 99 FX400 Plus Tandem CDROM controller card E 1 9 9 99 27 Watnall Road, Hudnall Nottingham NG15 Tel: (0115) 964-2828 FAX: (0115) 964-2898 STORAGE Quantum' Al200 OVERDRIVES Cirkva Eil I )1. 631 01150M11 1199.99 611 1 GIG 120991 1 1.2 GIG 122999 1 1 111; 1329.99 .3•5 - ( F 116999 . 6 A 119994 1 D 120999 . E 1 A500 ALFAPOWER l I.22 k 1(27a.ka kErik's STOP! 1 rk 6 9 270MB 110,99 .11.11sti; U AND THINK 9 9 ili 540N1B 1 GIG. 129999 Before you purchase your hard drive from elsewhere, just look Eolnrnaly albite MO Chive , ACCAttA500-• Can Sta poodouto ht . , PAS • pi RAM - at what you gel FREE with our drives!!! th Alt 3.5 IDE Hard Invite mom% an adaptor • Drives are formatted and hale. ..non heed treo e,A6001203 15 03 intstalled with WorkBench own purchased a hoOrhanel Kaparatoty dneel El 99 when • 100MB of top quality Public Domain software including- If you have found a cheaper Compugraphic fonts & clipart, ' IAON 14 ••••• price elsewhere in the magazine, call us and we will do our best to beat it. Lighlwave & Imagine objects. lop demos & music modules. essential utilities, games and lots morel The new Apollo A4000 Accelerator fits into the CPU slot of the A4000 (A3000r1). Fully upgradeable to the Motorola 68060 CPU (Call for prices and availability). Comes in 33, 40 & 50Mhz versions, 4 x 72p1n SIMM sockets (2 x 72pin SIMM for A3000Desktop) & SCSI-2 controller. 40Mhz E699 99 HOW TO ORDER CD ROM DRIVES AIWA CDROM External SC SI C D R OM f o r t h e Al2011 Plugs into the PCMCIA port Fast 390KPISec transfer rate Connect up to six other SCSI peripherals Dual Speed E C M • Please call - new drrxe expeded • PRINTERS EPSON Stylus Colour - II Inkjet printer offers photographic like quality when used with optional 7200PI printer driver (coated p a p e r required). Bu ilt In auto sheeffeecter• • \A • sirvi 4 STUDIO 2 - PRINTER SAN Professional p rim st u d io Fo r t h e Amiga. Enhance the output ot your 'N toy ,,, - , .0 wet. I4 printer Inc. 720DPI on Epson Stylus From only E 2 9 9 - 9 9 Colour On ly E 4 9 . 9 9 Coated 7200PI paper 069/50Mhz ES99.99 The 1220 combines the best Price/Performance ratio for any Amiga 1200 accelerator. With a 68020128Mhz and 28Mhz 68882 FPU, 1 x 72p1n SIMM socket (1 or 4MB). Realtime battery backed clock, Only E 9 9 . 9 9 BY POST - Please make cheques and postal orders payable to "usage Computers". Please allow 5 working days for cheques to clear VISA WE ACCEPT ALL MAJOR CREDIT CARDS INCLUDING SWITCH & VISA DELTA &Au GA 1200 "MAGIC" The awsome new AMIGA 1200 "ATIlbga Magic" pack is here. Software pack includes. Photogenics 1 2 SE Personal Pa in t 4 .5 WordWorth 4 Datastore 1.1 Digita Organiser/Print Manager Turbo Cato 3.5. Pinball Mania.WhiZZ PLUS FREF Mousemat & Dustcover MODEMS EXTERNAL BABT approved FAXiModern Complete wrlh all leads. PSII and Cornms software. 1_094 P0011 E 1 0 9 . 9 9 1/34•28,8410 E 1 7 9 . 9 9 LOGIC 3 SCREENBEAT SPEAKERS SB3 110W) 4MiGA M1438S High re so lu tio n co lo u r m u la syrc monitor for all the Amigas . stereo Built-in speakers E289.99 C15 99 SB25 125W1 E 2 9 99 SB PRO 50 (50W) ..... E39 99 SB PRO BO (80W) E 9 9 . 9 9 All speakers come with cables MEMORY SIM'S 4MB - E129.99 BMB - C239_99 16MB - E399.99 16MB - tCALL DELIVERY CHARGES NEXT DAY - £6.95 STANDARD - C3 95 strrstUIR !stilt iNc1i-01,1) Only £389.99 Add E1 0 .0 0 fo r a C H AOS Pa ck Pack includes:- Nick Fair/0's Golf, Chaos Engine. Pinball Fantasies, Syndicate 4000 Tower 25Mhz 6 8 0 4 0 C PU 1.269 SCSI-2 HD/6MB RAM AT/IDE HD Interface, SCALA MM300 E2149.99 Call tor details and prices on 060 version. ACCESSORIES 240 CAPACITY DISK BOX The Logic3 stackable Storage box holds up to 240 risks Only E 1 2 99 ASK FOR QUANTITY PRICES ALFA DATA PRODUCTS Megamouse•400dpi E 12 .99 Megamouse.3Button E l 4.99 Auto SMouse switcher E14.99 AT-8us2008110E. E 7 9 . 9 9 AT-Bus2008I5C5I ... E l 09.99 MaPower/A50011DE E89.99 Tandem C o n k - olio' EThe 5 world 9 ft accelerator . 9 9 r the A600 is here... Mhz 68020 CPU, 68882 FM 1 x 72 pin SIMM Socket (1, 2, 4 or 8MI3). equires internal fitting £139.99 Accelerator card for the A1500/2000. Available in 25 or 50Mhz versions, complete with 68882 FPU & SCSI-2 interface. Not compatible with GVP cards. FROM E299.99 BY PHONE - Credit/Debit card orders taken from 9.30am - 5.30pm Monday to Saturday. CALL (0115) 964-2828 OR (0115) 964 2898 TO PLACE YOUR ORDER
HI South shows you ow to emulate ore arcade game chniques using the of so cheesy Amos logs, eh? I bet you don't think about them or give them a second thought, do you? You don't have the slightest idea what I'm talking about, do you? Well, o flog, for the purposes of this discourse, is a vanwhich is set to indicate to a program that a in state exists So when the flog is set, some. ng has happened that the program should know , and more importantly doesn't need to check again. Until, that is, the state changes, in which se the flag is changed and the program then s checking for that state again. Confused? y iers use on example. In arcade games, you fire a bullet from your ship/loser/whatever. The program checks the buton and if its on it activates and moves a sprite across the screen away from the gun, ii let the sound effect of the gun going off, and ks the bullet across the screen until it hits ing. So you make o loop to check for the button on joystick being pressed. Simple enough, yes? el, the first thing you notice when you write a ine like this from scratch is that when you press Duton the loop checking for the button press round about 50 times a second, so when you t you get a horrible staccato buzzing noise the bullet doesn't ocivaly leave or the buzzing se stop) until you've released the button. The buzzing noise is the bullet sound, the bong, lig played many times over and over very fast, reason the bullet doesn't leave the barrel is that skirts its journey every time the button is sensed to ir the down position. So how do you moke the If you ca re fully hallow Phil South's If Tire(I) And MISSFLAI4 Then Sol Ploy 1 instructions you will NISSFLASal : Ildb 2,SX,S1,2 : NIzSX : NY.SY soon ha y. ships If 1I55ILIG=1 Then Add OX,S : Bob 2,10,17,2 : If shooting trom lb. hip - or some whe re /DOWN Then lob Off 2 : RIS5U6.0 ton press once and only once? Now you're MEM I N N • t -AMIGA COMPUTING FEBRUARY 1996 Nol with a bullet OVER TO YOU Why not send me your examples of Hags, and interesting uses to which they can be put. Making a process easier, showing the program that states have changed, even some interesting flip-flop effects (('II be going into those another time) - anything really as long as it's about 10 lines of code or less and it Mcludes a flag or two. I'm particularly interested in graphic elleas, but timing and more mundane task are acceptable. Perhaps there is on interface problem you can solve with these flags? Look into it. I'll look at the best in a month or two. In the meantime see you next month for another arcade game routine which you'll find handy when you design your own version of an arcade classic. getting the idea You use a flog Take the following example: If firt(l) Then Sao Play 1 : lob 2,SI,STa MPH : POW Add O0,5 : lob 2, 11 Oft 2 IoNT, 2 : I f O U P I T T I D O T h e n B h a That's simple enough Sense the joystick, make a bang [in this case a nice sample], then move the sprite Iwo pixels at a time from the barrel to the edge of the screen in a straight line. If it gets 100 pixels away from the ship without hitting something it gets turned off. But this routine suffers from buzzing and no bulets. The better way of doing it is: In this version, when the button is pressed the flag • • MISSFLAG is set from 0 to 1. In the next line the missile is moved only if MISSFLAG is still 1. Until the missile moves 100 pixels away from the barrel, the flag is stil set, so the fire button is dead. You only fire one shot. When the first missile vanishes [you could explode it, but in this case it just vanishes), you con then shoot another. Obviously, you could vary the timing so that you can add a multiple shot, perhaps, or make it a second (or 50/50ths of a second' or even half a second between shots, enabling the player to get his finger off the button. This is an extremely useful technique and one which answers a lot of those questions you ask, like 'how do you do that? Nine times Out of ten the answer is either flogs, subroutines or vectors. A side benefit of using flogs in your Amos programming is that these techniques ore used quite a lot in the worlds of C and assembly programming. So as and when you move on to those languages, as you might in the course of time, you will be prepared for at least one cool trick. WRITE STUFF If you have any other Amos programs or queries about Amos, please write to the usual address, which is: Phil South, Amos Column, Amiga Computing, Media House, Adlington Park, Macclesfield SKI° ANP. Please send routines on an Amiga disk with notes on how the program works on paper, not as text files on the disk. ,Make the routines short enough to appear in print, i.e. no more than about 30-40 lines of code and, if possible, make them use no external graphics, or if they can't be used without them then be sure to provide them on the disk in native f FF formal, and the same goes for sound files. Follow these guidelines and you'll be sure of making me a happy man if nothing else. 113
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11141 Issue 96 • February • 199
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RAM EXPANSION I I POWER SCANNER I I
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HE COVERDISKS IMAGEVISIG.II DEMO Pr
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k f i t t i r g i n s t r - . R E E
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1111•1•11n- ol o m pacha age fo
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• C i t i e s B o u r d i n , H e
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1 ProG aft' Supports all recent Anu
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ALIEN BREED 30 SIM CITY 2000 19.99
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You have read the review, now you c
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which is situated on the right of t
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Investing in AM I GA" Li Li Li Magi
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W u a ... nm rt . u., ; Video VIDI
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• IC 1 r - English map that comes
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n C ine ma s sce ne conta ins the t
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The IJK 9leading Light s Wave and A
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matically in the background and you
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lv NEW - UPDATED VERSION New Search
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I l e 1 7 7 CAMERA / 2 3 4 AM I GA
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3 and I'm on the track of the I new
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In _ a nd fully te xture d bricks ,
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ELF HELP .ammi I have owned my Amig
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RRIOUS PACK COMMODORE C64 113 ZX SP
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0 ISSING MMU I own an Amiga 4000/03
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GlIGP-ED V3 Produced by: Oliver Rob
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SCANNER FOR AMIGA 1200 TO 4000 COMP
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Turbocalc v2.1 • ( O M P R I C E
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A SSASSINS ULTIMATE GAMES 2 3 " M r
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The Power CD-ROM for the Amiga 600/
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Amiga Al200 Compute 2Mb RAM ik t
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w E A U T I F U L 'Id roe hive the
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Page 89 and 90: The backroom boys The programmer fo
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