WWWffi #wsww volUMEIt,NO.6 Cover Story . , . . . . , , . , , . . . . 54 MATCHINGPARTNERS puLledout ofa arrow or names be it Cupjd's Insteadofl€avingthingsto chance, partnen, €quallytalented you tennis progmm can matcb compatibl€ with this hai, basketbaU teansorjust two peoplewith the saneintercsts. b) Hariet Morill LAUNOHINGPAD ... ".." IN ONEEASYLESSON MICROCOMPUTERS trving to as novice as befuddled can leave the literature Plungin8 into conpuler compulerprimerexplains in Greek.Thisoasy-to-und€rstand readShakespeare a svstemaswell. on selecting in simpletems - andincludeshinrs the basics 21 DIGGINGIN C o N T R A C T F U L F r L L M E N T . . . . . . . . . . . ....... .. . . . . . . . . . . . . . . . . . . . . . . . 2 7 requileshoursoltine fulfi theircontracts Keepinstrackofwhich customers Thh proglarnshowshow to let your compuierdo andcompl€xrecord-keeping. lhework fof you. r/ Sdn./Vetrors€ PICKINGA PRINTER andprices PrhteIsfor lnicrosofler r widerangeof fealules,specifications your easlet. b! Chip A Tyeti sel€ction Hcrcwe reviewih€s€lactorsto make 60 ......76 . ,... R E L O C A T AR BO L EU T I N E S . . . . . . . . . . . . . . fil each your routines to favotite lewriting Are you lired ofwriting ard programming titn€andefforl by ftdividualplogla l You canssvene€dlcss by Robertlryinq usillgfelocatrbleBASICIourines. ON THELIGHTERSIDE PROGRAMI\T I IH NE GM O S T C O M P L E X C O M P U T E R . . . . . . , .-..,.,...... ,' " 2 6 lho mostcomplexconPuterin the universe Lenrnhow to progranr FACToRCAI\,|E....... game your malhskillswhilehrvingfun with thisersv"to-leeln Sharpen by lIerbeftL. Defihem .................. DOB T YD O T. . . . . . . . You plobnblyplayedrhisgamebackin ninth gradesludvhallandconsisientlv - andlosel beatyour fd€ndsrnowyou canplay against vour comPurer by Fred Helliwell 69 MAKING MONEY .....39 .. ... ... FO T R M .S. . . . . . . . . . . . . . P R I N T I NCCO N T R A C your or sell customfor own busin€ss you pdnt can conilacts Witl this!roglam andconlractors. to localbuilders,snal businesses adecontracts b! Cha esA. Matz F A E D B A C K . . . . . . . .- ...4. R A N D O M A C C I S S . . . .9. . . ONCEUPONA TIME , , . . 50 . . .. . . . . . . . . . . . . . . . . . . . . . . . T N S I DYEO U RM I C R O C O M P U T.E- R CHESS, . , , . 87 COMPUTER Joinuson a guidedtour thlough goes inside a computer? on What actually 9 9 PRODUCTCLOSE.UP,,.. find out. your innafds to nicro\ . ..IOI UP. WI{AT'SCOMING INSTANT REPLAY - 79 JUNE1e7s PersonalComputing I Factor Game BY HERBERTL. DERSHEM betweenthe the difference maximizes claimable ofits numberandihe sum A, valiable, A dimensioned faclon. storesthesumof theclaimablcfaclors of eachnumber.Thusthe computeis choiceis detelninedbYfindin8the | -A (l). rcmaining lafP,esl UstinBI showsFactoras Program on the DECsYsteml0 implemented NotesIe" compulersystem.(Program fer to this listing ) ProgramListing2 showsFactoras witlen for RadioShackTRS-80Level I BASlc.Iit actuallya moreconven_ to run,sincethe arrayre_ ienl Droaram anddoesnot need rnain;o; ihe screen Herbchosel3;the computercould time.Thh feature each f€writien to be claimnothingsincel3 is Prime ThePro" command. AT th€ PRINT uses and Afl€reachroundoi choosing abbrevia' use of makes gram listed as the reports claiming,the computer tionsin LcvelI BASICandomilsrc_ scoreandprintsthearraywith all Thccomputerfirst asksfor lhe stolage, marksto congerve chosenandclaimednllmbe$omitted nameoiits opponentandthenlets in ihe TR$80 ver_ modification One \Vhenit's the usefsturn to claim him chooseth; sizeofthe arrayof ifthe (l) is sei negative that A is one sion factors,the factorsmustbe entered Any sizefrom 2 to 81 will numbers. the . from removed I has been integer when no at a time with a zeroentered althougharrayssmaller be accepted, me since is necessary this featule srray. user the known.lf are morefactors than l0 don't makefor veryexciting inte' test an used to string subscnpied claims,the comanypossible miss€s prcsenc€ in the DECsysiemlo com' ser's th€ use. after puter them repods of choosing option Theuserhasthe on the TRS'80. iersi;n is not available pleteshis turn. first or lettingthe compul€rchoose lunsin 4Kof The TRS-80 il" to claim an tries Prograrn usef Aiso,ifthe firsi. Only ihe verynaiveof the v€ry RAM, conlidentwll let thecomputerchoose legalnumber,the computerMll repori Ambiiiousfaclor€rscaneasilyex' add, "You illegal and move is why the advan_ player has an {irst,sincethe lint pand thisprogramto work beyondthe the lalgerthe array'the loseyour turn," tage.However, limit of 81. Also,ifvou havea slowtel' re' been Whenall numbenhave smallerthe advantage you will plobablywantto nodiminal, recomputer the th€ anay, Thecomput€Ithenprintsthe array' mov€dfrom fv the DECsvstem10versionsothat it portsihe final scoreandasksthe user whichconsishof all integenfiom 2 to print'the arraveachtime. This ifhe wouldlike the oppo unity io plav doesn't thelimit ente.edby the useI,andin' putsthe hea\Yburd€nof nodifi;tion plav again.If the userdecid€snot to vitesih€ userto makea choice.The on You,but Youmay find bookkeeping the rePorts anymore,the compute! playernakinSlhe choicecenpickany longwaitsfor output. prefeiable to it nunbei of gameswon bY eachPlayer in the array- call numberremaining computeris too good find the lfyou andstops. it N. He then receiYedN Points.The for you,you cantonedownits gamebY SanpleRun 2 showsa listingof opponentscoresby claimingall factors choiceof strategvby sorne replacingthe the comanothergameandillustrates oi N remainingin the array for which lf, on the ofseLection. mndom form inpul. he .eceives the sumof all ofthesefac_ puter'sreactionto erroneous challenge you want a stiffer otler hand, ih choices Thecomputerdetermin€s game be colild its computer, from the in a simplebui ihorough way. It sums Pickingihe largostprime first is us_ a look_ implementhg improved by uallv a sood choicesincethe opponent the remainingclaimablefactorsof each aheadstrates/ for choiceselection. of thenumbersstill in the array.The canlhe; chin no points ln the caseof tr Hsppyfactoriig! that choice which conputer's mov€ is Run I , lhe sampleshoumin Sample gameYoucan Withthiseducational your in skills factoringinte_ sharpen anaivticalproblem EenanddeveloD game.Factor.is deThe abilitv. ;olvinq glade srgnedforanyonewith seventh mathlevelability.But brightvoungstersshouldbe ablcto playihe 8am€ wiihout too muchdifficulty. bY Thesamewasfilst descdbed J.B.Hrr-kinandD S Martinin theNo' lemb(t 1913iss'reof me Aithmetic ?ercftsrThh versionof Factoladdsto the flexibilityofthe originalandcan on a microcomPuter bc implemented syslcm. ProgramRun I showsa samPle same.Theunderlined Portionsare iypedby th€ user,who Playsagainsi 44 Computing J'JNEre73 Personal Decsystem1Oversionof FACTOR 'r '"" sorrouLrc ; : : i : l ; ; ; : : l l : i i i . i l " l ! " ; . i ' : i l i ; i c" : : : : : : : r ; ; ' l l l l " : ' l i i ' : l ; ; " " " - . - " ' .y r p , r yr : a ! { s ' . "iir;.";;:;il;; ;i:i^r;,1.";T,;:;i,,;;;,;;i';::.:lliiliilr t'-liP'l:.1"1:'il-!:i:^" ,iii:i:iil::ili;i,;:1,;i;:"1;l:l: l'il-'llll:,;:;,;itl!"iii:T::i:, ?ti:s ;i1r:;ir:::i!'i: ::l;i i:i* ::*l-;l'l;""'";'1';|L-{?"... r P r E px q I c FY o 0c L A T "F r c r o a s ' r ;:li:'"li;; ',;;';i-';;-..i".,"'.' t rcrcPrr o o i ' r oi i r ' , t " L r r s P r - a F .^iq^ nrr rr31r- !r31r d ; i ! ; i : ; . : r v ' a i i ^ d L "t s" ' " ' ' " ' " " " " ; ; . : t , i , , : : " " " " ' :l]n:::::: li,, ;;;;;;;;.,. a ^P;;i,';'P- "u' i;ii, l:t.iti1,.t:.,:"?,r:;";!'I:;: liiii iii::: ^::;.;;".,. P t r Y F s ' s5 c o P r ;1,;:si';;'";i:Bl.'-"' ,-'1"1p :lii:::l::: 3 .";;; I ii..' z -0ieo ppr{r nr,lrl rs ro0! {4r"": ) t c o n l i a u t J o r l h l L , , r i 4 eI , a E . Pro€,ramNotes lntrodrcio'v retarrs i"itiir'..'i'" iio:iio 'nt insrrsr!tns io! nlavrnq' o r v ' r 1 a b l e so r r ' r r r v s ' rorPute!r5 !oro' ftnd th€ b€st chol'e' noco!a cholce' rcc6pt and vclidate ar"rrrDs' R€cord c1^rtr8. 65GtllO 650-7qO aii-qso a6n- 1. ! 1 iii,:iido ii;i-i"; . n 4 r d r l r v o ' t r r c r { i i e dr ' * o r s ' Tost for end or q'!6' 11tO-lltO 1160-11?o Print boatd. t1€0-!510 rl.Y 6r! s !ov6' rccept 6nd vdlldate chorcd' tlao-1230 l?:::i;?3 liff:'":l:ic:;d,ecorn.rr c'aii.. 1 52 O - l 5 l O lnht bo.rd' - herq'i" !lii: '., or*r dno, iili:ll,ll I:i:.':l""il"li to prtnt rh€ hoar'' )oo0-2090 suhrootlne ll ,ou SampleRunII (Userresoonsesareunderlined) 2 : : i ' , ; : ^ t " $ i i l " " l $ i ' f - " , " ' , r { ! 1 yq 1 ,-' .1 5 ; i;; ; ; _ r r o c u o o s Er r p . . t r = y E q , 0 _ { n ) 2 11 1 12 o q 5 6 r',r 14 15 Do rc! cn.osE?11 J C ti I | ' | a ;E;;;;".rPa ! 5 5 l4 15 ' ' qt ,o=no*u b 'lCt c'{oosr ?]: tlHAt NUn.!B DO tnIa tstN. 2 co1?n'tti! s sconl 1 12 "t''' 6 '.e!'EPrs 2B 7 b Y r s-^i' 'o v . nr n = u o u o ) ' s l l , l T i ; ' 1 " ' l ? " " 8 ' o o ..'"o, u 2A )q _ ^c'.Pr_'ats'"PE Norlr[c. {rRBrS SCoB? 1l 2 t ! : 6 l( 15 c c r i F 0 t ! r rs s c o F E 0 7 ruNF:1!7s PenonalCompnting .;i;: ;.,;,i ri;,. J{{' , lDoqrr\,\ o1){: 0 0 3 1 0r r x > ! 1 l n n N 1 6 0 qo3!0 rr N<2 flltr,l -160 r0l50 rF s=rlrr({t THE[ ]30 i iio iir', iiiL;",1 ( 1 : Y i s , o = N or); ;o;ei pRrir IF {c_1)*c:0 lrlENu40 CO40O r t o r r l 0 p F r{ T i P L € a sE 0 c 4 3 0F r r . ' rNIrral,lzL a,3r.{) .Nso 1 0 q 3 0F o R r . 2 1 0 N : 0 ' 1 s 0 N ${ r ) = s l i 5 ( r ) r P I > 9 T H r l r5 ? 0 )0tcc t(Il=tr "1n5{r) r0910 s U s R O U T I I I I2 O O OP F l ' I T S T H ' A O F A Y . 0 0 5 5 0R I i r * r s r T ! A € n A { , J ) . cc:60 roF r-2 To N,/2 C05?0 Fo8 J-2tI co53o a ( J )= ^ ( J ) 1 r r t 0 6 r oF E n * . . 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' i H A rN U r ! ! r D 0 Y c n c 8 ] 0 s r ? 9 4 6 r r C a l r r J : r a r, s c n l r 53 n Y 1 n R N . r C H O O S E1 0 e 9 l ? f r c T . ! o F 1 0 D o Y o n ctrni i^:Nor!) ?g c o r P r r T E sa rs c o 9 r ( t 6 to0e ru:N. curl suIBt]i Do rrN[r,.a.cr - [ERi 53 ( 1=r.Es.i.N4) '. !arir ro rLiY ,\erIr SampleRun2 (Userresponses arrlrurdedined ) r 1 Yt ' r 9{ . I.!O0sE 3 lor clrrr t).'{.p'l ?0 xsrl 1s vooF 'r^i! ?!!!! ' I i J r A F P A a? 1 5 x0l LIFcF Do rou !iANr 10 cHoos! Flrsr (r=r.s,0=Io) 2 46 I ' e r s o n rC l omputhg r!NE re73 1 \ 5 6 ? a ' r0 ?! 6r P. : : : l l : 9 : : , 1 ' ; 9 " ^ ' " ^ ( 1 , l a n c H o l cD i i i i o i ; a t ==zr'(ot ) _ D ltrl .09t0 ; 1 i l : : 9 1 : . : ' i , " " , P , L L ' r c r o P 'st ' r ! E D ' g,l'l't;;l:lii"'l?:" .'"",'" .li:: """ L / 2 r o r = 2 P o f , oro5o -.-- .^^^ i i , i i i i L ' r ' t " L r s E rl o c o iiiii I i'! " i !RINf 0rc€O :il:3iil:l:"":' i l l 3 3 ' 1 , ' ; ? , 1 i . ! "! 1 , { F1,1r ? o 0 r t 6 0 P R r l " I P R r r l Ta s B A Y ' . n' s. . . illlS:g;li.'l:i,1's pLA'ER ayo'Rr.RN' rr{i1 N'.B!F Do Yorr*roos'D: ;il$ :ll:: liit: :::::.""., :;l:;;; ' " - , , I r c - N - 1 ) < o1 r 1 ? l 1 z 6 o ; t ' d i . ; o i : ro ' , , " c e . .lii;;;"li D r , 1 8 "1 3 0 0 r:1:::9":.1:?:,. c"oost ;i:;; ;;';i;;i" rs ror avrrL,DLE. :li:: :::1.:'l;"^," r (r, FoFrilrq cHorcF ii:,io ini r=z.c ro n srE! c c1rlo rlr)=a(r)_c :itr:.'1,:"iii.i i0llfS rr3o rr ^ lc)>0 1flE[ rczu .rr9o FRr{T" IrOTllIr!c_" PRrrrrLLc'r1r{s' :lll| $:l-l';9'" L*rD /2 o 1 u ? oF o Rr ' 2 T o __.-....^^ i.'o :lii3 ii ii+llt;'.;.ll'i'ii rc NslrP' iil-l-ll' iii:8 A( J ) = ^ ( r ) _ r | 1rl-10 .1aoo N 3( t ) . , ' 't lnE^nnr1. 3l:;3 i911.lPBlN1 015q0 fiEr1.*r TDsl rO! 01550 roR 1:2 !O lr { ra60 If lrr(r)<tn " ) lContinuedDt]folk)wntgPagc .t2 11 2^ 13 )) 12 21 1A 23 15 2r 15 16 tJ cLAIN r0*'io{.1 ?11 2 11 2A t 4 5 l i 1rr 15 12 1l 22 2t i' . ; ,.; , 'i jn ,r z, ' " " ./ : . , rr :: fl€t!'s 11 12 2A 21 25 nui!'n Do ro! cP.os! ??: b a ru 1t 2r 7 16 r? zi o 1 lo )7 - scoxq 52 1l 22 1q 15 2u ?21 ]b ^-""," ; ; ; . 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".r ,,i ;;;'";';;r Yor DLrY r'A I I Ti F .orPUrBs. i.,'e"' { { r r D P R .r ' ! r rHrN"L^-r" ;6 ;: "iii. ,u;sER! co p. .ircroRs ot YouscHorcs. ioo"i,. ic'roose r . ^ r , n r s r r r l r [ r B Er n o \ y . r n n e o iuulrnB e ^- ' l v ' 1rqn ' I' I F P c E T v q? r . ir6 p. "por*rs ii; ;: ";;.i ruir to <ttoosP 1qo !. nLlf.s PlrY PAcfon!n li6 n. 1r0 r? !;i ;ig6 i. !00 rP r1O P. r'1' r{e rcc4Y (r4Y. q lni:r!_ \ "ro, rrr"e ti)1'att<32lrli=!r'!(nllr rr r30 ;itt;cit rri.oe errrPto. c os! !tRsr (1'rEs,c=rol,irr'i' "(ico: t o; u r t r i r r hr os r c tqt o q0 l, {c=01 n P L E r s E3 l i r t 9 1 o r 0 " : G . r A 0 !50 P. ^t 0,lt;'is 5C01, rr:^i 460 P. 11 l?,irns-30's 5c0R! n:E rrr:\' r { l o t . T ? r o u : r ( I l = 0 : P ' r 1 L ' -r rBPr D T:^(Jr r(Jtrr:[, 5 6 0 p . 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