Amiga Computing - Commodore Is Awesome

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ke you in Deed of a fag la, is et easier than even share • For every • Includes cobk °rookie between two Amiga's? Llano, Atoll the seam, led it nued • foe Masa wilt sod kedge' oral big needs. you con tikes ond pan horn wa 7.1) on with a fret mad pi • indodes Commodores Envoy nemoclung saltionue • foglish manual • autematooly reolootitm alter Ire lbootmg mthout new shekel • (goy newhine usable as server and diem 64.9 4 root' Picasso II with two O output on any TV or WCR. All with see from braorkeist video encoders Thai • 'N 40' is why the ROSSO II video e Pablo, won in the (German) magazine 'Amiga Nagano tissue 5/941 lest for video encoders • tables included - RCA, • i S-n included •e r V1IS s , ammotion demos mid more E • • a n • goo tine I I no lorreSlot required d • Easy installation of video modes S C A R 1 2 9 9 5 . T Don't get overwhelmed et solthi op a network, use our Anadne Ethernet We with all Amigos that hove an available lotto Slot. This y Busy to network - it also equipped with 2 additional parallel multiple network solutions. • 1011ase-1 (Thin Ethernet, • Socket lot Boat-tOki øendI °Basel (Twisted pair, western Wall : • SAKAI compatible driver for ethernet and paralel port • Hook op to two additional Amigos to the paralel ports with Liana • 32KByte code to support CPU • Includes Commodore's Envoy networking software • English mount V AG Welweg 95 D - 3115 7 S o r s t e d l •10 technical Hotline -11 Orders -40 Mailbox p '110Viii.Z.kriEratiette_ lii i I I I I -49 FAX ORPAve ,9 • More itnin 20 load oil soue-itodules tor ov /1/3/1. ations nod pictures • • features: ktiV1 Ste, GIE, 01 Qc, - ) • • Congiete Anim3 uiklime Quicklime ared Support up to 24 IV • ker • Index,-ide lot quic retool* cibirs cod with ol or up to n 16.7 maws colors as wel os saralli linego-sue • n • molions Supoil al env gro o o . w. • nOleo modules p lot raveling elerts fld,/ into the animmiori OW, Soak Scale. tocne, n • • 19 sound m odules lot 111 • Amos leaning, 06 votes) conuerft splitting and creating anitwations go • tasy-to use intuitive graoltdol user-oneriace E 199.00 sound • Progiormwable ?ort - o r / m c u s i p l o r Ilittenoft i • 6 Drakes Mews • Crovmhil • Milton Keynes. Buckinghamshire • MKBOl t a c k Order Eine 44 (0) 1908 261446 t o m Queries/Technical —44 10) 1908 2614-77 p t e Fax 14 fel 1908 2614418 v d a 885 .)1908 261 g 4 A • Priue Dealer 9on min ac.i Ami qud Firma II RIG, the graphics board all others are measured ogoinsr • Graphics board for all Amigo's with lorro-Bus - Workbench driver to retarget oil 2 MB progrants and WB to the Picasso E 329.9 • Supports up to 156 cokits with WB3.1, even on 42000 and 43000 • WB resolutions definable up to 1600 x 1280 pixels • !Kolar (16U) and TrueColor (248i1) graphics: 161A cokust • Drivers far most graphic programs such as MIN, ImogeFX, ImageMaster, Reo130 • Alows connection of any VGA or Muliscan monitor • Al 084 and Al 081 are sill usable with a special rabk • Black borders gone forever, hies fal advantage of manes capabilities • Systemcomplient implementation of monitorfile, resolution seler table using screen made-requester • Monitor-file Eomplioni with System 1.x on higher, resolution selectable using screimmode requester • View regular Amigo and speod Plimsol-RIG screens an some Monitor without changing cables. • Saeen promoter to make older programs work on Rosso • Droggoble screens • Available with liAB or 2M11, upgrariable from lidt to NB at anytime Imonc All I . lammed
Paul Overaa explains how AlRexxis de-bugging facilities an be used to find errors in scripts ebugging and testing con be one of the most time-consuming stages of any software development, and ARexx scripts ore, of course, no exception to this. The use of proper structured design techniques, modular programming, topdown development and so on titips, but it will not eliminate all the problems. No Tatter how conscientious a programmer you ore, some mistakes are bound to be made. Sometimes problems will be due to simple syntax !tors caused by, say, a basic misunderstanding of ow a statement should be written, or a dyslexic slip at the keyboard - inadvertently writing Uppre(l when you meant Upper( for example, or writing a s ebecause you didn't hit the shift key at the right time. mSuch mistakes ore usually considered harmless because they are easily found and therefore easily i orrected. - ARexx is very good in this respect and not conly will it identify most errors but you con be fairly oSure that any ARexx program which gets to a l noble stage is going to be nigh on 100 per cent ontacticaly correct. If, whilst developing a script, you get past the n ol syntax error stage and your program seems wrun in some fashion, then often you will be home hnd dry. Occasionally, however, things will go e ong - o program may run to a point arid then for n a obvious reason moy lust fail to behave as expected. It's at this stage that we enter the realm y debugging proper and one of the most important o s available to the modern programmer is easily u ble trace facilities. mARexx supports two basic modes of tracing: e sly, there is the normal Or 'non-interactive ' troc• amg mode which simply alows troce information to viewed Secondly, there is on 'interactive' mode n hich allows the programmer to step through the t °gram and interact with it as the trace proceeds ttea sidin or sterr if available'. It is possible to look o at the contents of variables, re-execute clauses, and weven type in instructions which are subsequently r xecuted as though they were o part of the ogram itself. i t HU, ttiLim• • AO C DONIPLIMINel• • e , . ••• a . • • • . ••••• • • • • • I—• Not •_ 1 •••• c • be. o l IIIMM...e,agm/O h• • • o I l • n 0 1 0 1 4 1 1 0 • • • • • • N . 1 1 1 , 0 0 1 0 1 4 • • • • 1 •••••• 1 • ,,s1• • • • • of. ...P O W 1 , 1 - • • • • • • • • rft-Sin - I E l i An ARa e rs tra cing console window in action. Bug 1 huntin ALL T r a c e s all clauses as they are executed. BACKGROUND This mode is the same as OFF except for the fact that the TS support program con not override it. COMMANDS A l l command clauses ore traced before being sent to the external host. Any non- zero return codes are also displayed. ERRORS C o m m a n d s which result in a non-zero error code are traced. INTERMEDIATES Clauses and all intermediate results of expression evaluation are traced (including values of variables, the results of function calls and expansion of compound names. LABELS NORMAL OFF RESULTS SCAN Traces labels reached either in sequence or via flow control statements. Default tracing mode. Similar to the ERRORS mode except that on error ceiling value (set using the OPTIONS FAILAT instruction Form) is used to determine whether or not an error trace should be generated. Tracing is turned off by this option although this situation can be overridden by ARexx's TS program. Traces the results of every expression that is evaluated. Similar to ALL but it is a parse-only scan so the program does not ac•ually get exerL tod. -11110111W I M P Tablet Sr Options a va ila ble . with AR e sx's TR AC E instruction THE TRACE INSTRUCTION The syntax of this instruction takes the general form— TRACE [ symbol I stringS I I [VALUE] expression]] which means that three basic forms of the instruction exist, namely: TRACE symbol TRACE string$ TRACE [VALUE] expression where the symbol, string or expression must either represent (or reduce to) a positive or negative integer, or be one of the options (or a single letter abbreviation) shown in table 1. Negative numeric values, incidentally, indicate a 'suppression count', which turns ARexx's tracing off for a given number of clauses. A positive value given during interactive tracing indicates that a number of interactive 'pauses for input' are to be skipped over. The trace output itself can be sent to one of three places: Directly back to stdout (which for programs launched from 111111=Mit ' 1 1 1 AMIGA COMPUTING FEBRUARY 1996 •.J CU/Shell console is the CLI/Shell window itself); to a file associated with a standard error (stderr) file handle (this can of course be another console window); or to ARexx's Global Tracing Console (a special console which can be opened using the TCO utility program). Before deciding where trace information should be sent, AResix checks for the existence of an stderr file handle, if you have opened a window or file tied to this file handle, or have opened the Global Tracing Console (which is automatically attached to stderr), then ARexx will send its information to this destination, otherwise it will send its output through the standard output channel (stdoutl. The benefit of having trace information sent through a separate channel is simple - it avoids having trace output and normal program output intermixed at the same window. Of course, what we need now is a few examples of these facilities in action to drive home the ideas. Needless to say this is exactly what's coming in the next issuel
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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
Page 55 and 56: The Power CD-ROM for the Amiga 600/
Page 57 and 58: Amiga Al200 Compute 2Mb RAM ik t
Page 59 and 60: w E A U T I F U L 'Id roe hive the
Page 61 and 62: HAT'S NEW PUSSY CAT? Tiot indeed. W
Page 63 and 64: ou could not but help notice the pr
Page 65 and 66: E i >( ta.; a) t • 2 00- a) o vt
Page 67 and 68: Emplant - Macintosh and PC emulatio
Page 69 and 70: n the beginning the earth cooled, t
Page 71 and 72: ne of the most common problems most
Page 73 and 74: THE WORLDIs FASTEST AMIGAS ARE ON T
Page 75 and 76: \HIGA BACK CATALlOGUE Ti FLIE6 AVAI
Page 77 and 78: Reviewed , OMIS The best game of 1
Page 79 and 80: yen more Doom s. I'm afraid so. Jus
Page 81 and 82: you'll like it... but not a lot...
Page 83 and 84: CD32 too! The joys of Worming are a
Page 85 and 86: Meanwhile the mad scientist demonst
Page 87 and 88: it2.7.VLL, E05.9Bilizmi.111 SEASON
Page 89 and 90: The backroom boys The programmer fo
Page 91 and 92: Manual read I'm not really the sort
Page 93 and 94: Take your pick from the many shops
Page 95 and 96: K e i g i t 'ojanaent Pun NIde(thIn
Page 97 and 98: t, Fit for anyone, The first thing
Page 99 and 100: 1 The space track is by the far the
Page 101 and 102: " am', amig 9" guiaGUIDE " riigc gu
Page 103 and 104: 1 FALCON per i or performance. Full
Page 105: Paul Overac delves beneath the surf
Page 109 and 110: el Mohr thinks some people really d
Page 111 and 112: ank \ord shows u how to avoid ows i
Page 113 and 114: HI South shows you ow to emulate or
Page 115 and 116: Paul Overaa looks behind the scenes
Page 117 and 118: Steve White explains how you can ma
Page 119 and 120: • • • • • , 5 1 Gary Whit
Page 121 and 122: Paul Austin explores the on-line of
Page 123 and 124: 41,0 041.5 "Breathless has boldly t
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