Section 2 - Commodore Computers

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152 COMPUTEI COMPUTE! May, May. 1982.lssue Issue 24 0121 0350 NGOTO =$D911 ; NDF,MAL GOTO 01 01222 2 0350 FRMEVL =1007B ;EVALUATE EXPRE SS ION AT 01 0123 23 03:)0 ; CHE Cf( ON STAU( POINTER 035D NGOTO NORMAL GOTO 035D FRMEVL =$DD7B EVALUATE EXPRESSION AT TXTPTR 035D STAU( STACK =10306 =*D3D6 ... PET/CBMNIC? PET/CBM/VIC? SEE SKYLES ... PET owners everywhere sing )) Thanks for the Memories^ Memories)) CHECK ON STACK POINTER 01242 '1 035D 50 GETADR "' =*E752 IE752 ; TRANSFERT I~ S FAC TO L.INNUM LINNUM to good old Bob Skyles 01 0125 25 03:)D 035D . . . they should .... . . because Bob b Skyles is the onlyy 01 01262 6 035D ; IGOSUB PATCH: PATCH? complere complete source for memory boards for allY any PET ever 0127 01?! 03:)\) 0 35D sold. Old Bob won'tt forget you. 0128 035\) 035D A903 GOSUB LOA LDA 13 And the Ihe Skyk-sS k yk~ Ilu'mory memory systems .,y.,tcm~ hit\c have 11ll' the highC:'1 highcsi (IUalll), quality cOrllrol control of any ;NORMAL : GOSUB RELOCATED computer product ever. Oq'r Ovei 100 1(K) million bit'i bits off Sl Skyles yk\ memory hoard boards.. arc fC alr('ady already illl in tin.1 hl' ficld. field, f'ir F i r ~ mt quality,t si at aiicic and dynamic RAMS. RAMS, solidI ~ol ~o soldered ldcr ed on 0129 0351" 035F 20D6D32 JSR JBR STACK first r ~t QlI quality yglassepo.-:y. epoxy. Thai iswhy i~ theyareguaranleed—in Ih l')'arc ~mmmlt' (' tI -ill ~pil{'of spite ofihe lh{' new III'W lower prices—for priCf'.~- ru r II ;i full hl'u Iwn years. ~l'a . ;Ff((]M :FROM *D921 ~'D9 2 :1. The boards. boards; inside the PET/CBM, / em .... t. install in~lall in minutes minuIl'\ withoul lI'ilhout special ~pe l toolsort l s or 01 01300 03620 A5B9 ASB9 LOA LDA TXTPTR+l TXTPTRH. equipment. . . ..JUSI juM a screwdriver. ~(;Te \\ dri\' e r. ;STORE TXTPTR TR BecauseB eeau~eoff oll ourr new dynamic memory rnemor y design, d e~ign . and 10 tocclebrateold cekbr:llc old Bob'1.3Oi* ', JO:~ birthday, here arc are Ihe the smashing .. new price,: prices: 0131 03610 36^ 18 F'HA PHA 8K Memory System orig. 5}.50.00 $250.00 nuw «««' S}OO.()() S20O.00 SUI'I' Save $ 5 50.00 .50.()() I6K Memory System onx. $450.00 now $300,00 Saw $150.00 ; DN ON STACf( 16K IHmlQr)',\'ystem ori~. 501.50.00 I/Q W SJ OO,OO So\'{' 51.50.00 STACK 24K UK Memory Meml")' System ori/-:. orig. $6.50.00 $650.00 fUl'" now $400.00 S4()(),{){) Su\'{' Save $1.50.()() $250.00 0132 0365 36:) A5B8 A~) E:El L.OA LDA TXTPTR I~ ". ...For Forany PETel·erlllur/e. PETe\er made. When ordering. ordering, just Just describe your PET by b),modcl model number and indicate Ie the I Ill' amount oum and tYPl' type (or brand) of memory currently in 0133 03670 18 48 F'HA PHA the ihe uni!. unit. 013'1 0134 0368 A576 L.DA LDA CUf(LIN+ CURLIN+: 1 Shipping and Handling andfin/: . . . . (USA {USA/Canada) / Callotla) S3.50 $3.50 (Ellrope/ (Europe/Asia) As;a) S1SM St5.00 Cali/ornia California residents resldefl/s fIIIIS/ must add 61fCl/ 6 To,-6'.- 6 V: % °.'n salt's sain tax, /aX. us as reqlllred, required. ;STOR : STOREE CURRENT LINE NUMBER Visa/Mastercard nrdt orrien: rs: call tollfrce tollfree (1\00) (»(H)l 221·9998 227-9998 (exccpt (except California). 01 013535 036A 18 43 F'HA PHA California orders: please call (415)) 965· 965-1735. 1135. ;ON STACf( STACK SkYleS Skyles Electric Eleclric Works 01 01363 6 03 036B6B A575 L.OA LDA CUf(UN CURLIN B231K IE South Whisman Kuad Road Mountain Vir View, ..... Califnrnia California 9"().J *I4IMI1 0137 0360 036D 48 '18 PHA {415} (415) 965-1135 965-17.15 01 013838 036E 0 A9E:0 A9B0 L.O LDAA 'HE:O ; MARKA R~ ( GOSUE: GOSUB ... PET/CBM/VIC? PET/CBMNIC? SEE SKYLES ... 01 013939 0370 0 18 48 F'HA PHA ' ION STACf( STACK 0110 ^0 03717 1 207703 03 JSR .J ~' F\ GOTO ; 1)0 DO A MOO MODIFIED I F1T O GOTO TD 0111 0371 0374 1CI)207 4CD2D7 .JMP JMF NGQBUB NCO SUE: ; "·INISH FINISH NORMAL. COSUE: GOSUB 01'*2 '12 0377 01'13 01^3 03770 ;GOTO JGOTQ PATCH: 01 '11 'H 03770 ; JTHIS IISS WHERE THE the: EFFECTIVE effective CHANGE change OCCUF\S. occurs. 01 '15 0377 ;BY jby REDIF\ECTING redirecting THE the EVALUATION evaluation OF df WHAT what FOL follows LDWS 01 ·'16 03/7 0377 ; jthe THE GOTO goto OF\ or GOSUB gobub TO token KE N TO to FF\MEVL frmevl (W (which HICH 01·'17 01-47 0377 ; devaluates EVA LUATE:S THE the EXPRESSION expression FOLUlWINC following THE the TOfU:N) token) . 01-48 '18 0377 ;AND ;and THEN then TF\ANSFEF\ING transfering THE the RE result SULT FF\OM from FAC fac 01 01^9 '19 03770 ; jcthe ( THE FLOATIN floatingG POINT point accumulator) ACCUMULATOR ) TO to L.INNUM linnum o 0150 1 ~.'i 0 03770 ; j (WHERE (where THE the REMAINDER remainder OF of THE the ACTUAL actual. COTO goto 0151 ~H 0377 ;;routine F\OUT I NE EXPE expects CTS TO to FIND find THE the L.INE line number), NUMBEF\) , 0152 ~~j2 03770 ; jlabel LABE L AND and EXPF\ESSION expression EVALUATION evaluation FOLL.OWING following 0153 ~'j3 0377 ;COTO jgoto OF\ or GO gosub SUB IS is EFFECTED effected. . 0154 0377 0155 ~.~ 5 0377 2 00000 0 0 03] COT gotoO J jsr !3 F, NEWGET newget ; jget GET next NEX T CHAF\ character AC TEF\ 01 0156 ~ 'j 6 G37A 03/A 2207BDD E: Jjsr SF\ FF\MEVL frmevl ; i EVALUATE evaluate EXPRE expression SSI ON 0157 03/ 037DD 22052E7 0 ~) 2 [ 7 Jjsr SI:( GETADR getadr ; ^transfer TR ANSFEF\ FAe fac TO to L.INNUM linnum 0158 030 388 0 1C1 4C41D9 11)9 .JMP jmp ngoto NG OTO ; ffinish FINISH normal NOF\MAL. GOTO goto 01 0159 ~.;9 0383 01 01606 0 o 0 :lIJ:3 383 .END ♦end ; jend END Al' assembly SEME:l..Y
tvk:rv. 1Q82.lssue 24 COMPUTEI 153 Moy. 1982. Issue 24 COMPUTE! 153 "Garbage collection" reJers 10 the Long deLa.ys which can "Garbage collection" refers to the long delays which can occur while whiLe the computer cOllllmler rearranges strings. slrings. This is article (".tieLe shows how to 10 avoid these lhesf delays dela)'.' when you are a.re working riling with significant numbers of strings. The Th.e technique "~clmiq/l (J here h(lre is most lIIosllIseJll1 useful for J01' PET/CBM owners who have alder older machines. lIIachines. Newer machines with wilh BASIC 4.0 avoid these Ih ese problems. Inob/ellls. Screen Input Screen Input On The PET On The PET Elizabeth Deal Elizabeth Dea Malvern, PA Usin g the information placed on the screen as a Using the information placed on the screen as a source ofo f input inpul seems like a contradiction contradicLion in terms. Why should one bother inputting something when ' Nh y should one bothe r inputtin g somethi ng when one alread y knows what it is' I stumbled upon one one already knows what it is? I stumbled upon one good reason and worked with it to a happy py ending: no garbage collecti on delays. no garbage collection delays. ThisT article runs through a series ofo f small experimments. Both BOlh tests and conclusions are based on work in the Upgrade PET. Users of ori gi nal on work in the Upgrade PET. Users of original ROMs and pre-Fat40 BASIC 4, 40 and 80 column systems are invited to try the tests. I suspect that the results will be the same. However, simple as it is, I just don't know how the whole thing will behave in anotherr PET. The concept of null input might be handled differently Ffe and, together with POKEing two system locations, it might crash the PET. This two system locations, it mi ght cras h the PET. T hi s mi ght mean it will need to be reset. There is no might mean it will need to be reset. There is no way of telling until you join the fun. Screen input, as described in thiss article, is most valuable in thee systems prior to 4.0 BASIC as it shows yet anotherr way of minimizingg characterr string handlingg in our questt towards a garbageless PET. My method is limited , however, to onl y certain PET. My method is limited, however, to only certain applications. The entire problem was explained ed a nd a more gene ral proced u re was proposed by and a more general procedure was proposed by Jim Butterfield in COMPUTE!, September, 1981, 1, ##10. I O. BASICC 4 users, ooff course, don't sufferr fromm these problems. T he reason I became inte rested in screen The reason I became interested in screen input is twofold. . First. First, the suggestion aappears in the POWERW E R T~ manual, aand it made me curious about the method's mutility. [POWER is a chil) chip which add, several commands 10 BASIC. It is sold b), ProJessional adds several commands to BASIC. It is sold by Professional SoJlware.] Software.] Secondly, I have a very nice ddisk utility which displays all the sorts of data about the con tents ooff the noppy. floppy. TThe program carefullyy displays that information by use of ordinary PRIXT NT state tements (no reverse fi eld , no cursor controls, nothing, ments (no reverse field, no cursor controls, nothing. just plain letters). I needed to lift this data, put it just plain letters). I needed to lift this data, put it into va riabl es, a nd use it for other things, not ex into variables, and use it for other things, not ex cluding a sorted n listing. It seemed like a simple task, until a seven minute long garbage collection tas k, until a seven minute lo ng garbage colleclion za pped me duri ng testing. zapped me during testing. The T garbage collection occurred because, although the program originally concatenated although the program ori ginall y concatenated (added) ) pieces of strings by use ofo f PRINT I statements in a loop, as in ments in a loop, as in PRINT#4,CHR$(X + +48); I had to change the code to I had to change the code to V$
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Page 3 and 4: May. 1982. Issue 24 COMPUTEI 101 Ma
Page 5 and 6: • the battle for the moons of Jup
Page 7 and 8: May, May. 1Q82lssue 1982, Issue 24
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Page 11 and 12: • Announcing the Printing Breakth
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Page 17 and 18: CBM Maintenance In-House DOWNEY, CA
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