Antic Magazine 1990 April

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0100 .OPT NOLIST¢0105 *=$1F00¢0110 BP¢0115 LDA #2 ;INIT RESET KEY¢0120 STA 9¢0125 LDA #BP&255¢0130 STA 2¢0135 LDA #BP/256¢0140 STA 3¢0145 LDA #0¢0150 STA 580¢0155 STA LN ;LVL VAR=0¢0160 STA SP ;SPD VAR=0¢0165 STA 82 ;LMAR=0¢0170 STA JLOCK ;UNLOK JOYSTIK¢0175 LDA #39¢0180 STA 83 ;RMAR=0¢0185 LDA #7¢0190 JSR GRAPHICS¢0195 LDA #64¢0200 STA 16¢0205 STA 53774 ;NO BREAK¢0210 LDA #HPOS&255¢0215 STA $C0 ;DEC ADR L¢0220 STA PHPOS ;HPOS PTR L¢0225 LDA #HPOS/256¢0230 STA $C1 ;DEC ADR H¢0235 STA PHPOS+1 ;HPOS PTR H¢0240 LDY #0¢0245 MAKEDEC¢0250 LDA #$DE ;"DEC ABS,X"¢0255 STA DECS,Y¢0260 LDA $C0 ; ADR TO DEC L¢0265 INY¢0270 STA DECS,Y¢0275 LDA $C1 ; ADR TO DEC H¢0280 INY¢0285 STA DECS,Y¢0290 LDA $C0 ;INC BY 8 ADR FOR¢0295 CLC ; 'DEC' INSTR TO¢0300 ADC #$08 ; GET NXT IN LYR¢0305 STA $C0 ; OF STRS¢0310 LDA $C1¢0315 ADC #0¢0320 STA $C1¢0325 INY ;MAKE NXT INSTR.¢0330 CPY #72 ;DONE ALL?¢0335 BCC MAKEDEC ;N:CONT¢0340 LDA #DLII&255 ;Y:INIT ADR TO¢0345 STA $C0 ; MAKE DLI IN¢0350 LDA #DLII/256¢0355 STA $C1¢0360 LDA #LT&255 ;INIT PTR TO¢0365 STA PLT ; LUM TBL¢0370 LDA #LT/256¢0375 STA PLT+1¢0380 LDX #0 ;#DLI'S DONE¢0385 OMDLI¢0390 LDY #0 ;#INSTR'S DONE¢0395 IMDLI¢0400 LDA DLIP,Y ;GET INSTR.¢0405 STA ($C0),Y ;PUT IN DLI¢0410 INY ;NXT BYT¢0415 CPY #15 ;DONE?¢0420 BCC IMDLI ;N:GET ANOTHER¢0425 LDA $C0 ;Y:INC ADR WHERE¢0430 CLC ; DLI IS PUT IN¢0435 ADC #15 ; MEM¢0440 STA $C0¢0445 LDA $C1¢0450 ADC #0¢0455 STA $C1¢0460 LDA PHPOS ;CHG DLI INSTR¢0465 CLC ; TBL SO NXT DLI¢0470 ADC #1 ; REFERS TO NXT¢0475 STA PHPOS ; STAR'S HPOS¢0480 LDA PHPOS+1¢0485 ADC #0¢0490 STA PHPOS+1¢0495 LDA PLT ;SAME FOR LUM.¢0500 CLC¢0505 ADC #1¢0510 STA PLT¢0515 LDA PLT+1¢0520 ADC #0¢0525 STA PLT+1¢0530 INX¢0535 CPX #192 ;DONE 192 DLIS?¢0540 BCC OMDLI ;N:KEEP MAKING¢0545 LDA #3 ;Y:ENABLE P/M¢0550 STA 53277¢0555 STA ERP ;LVL 1 PSE¢0560 LDA #$40 ;PMBASE=$4000¢0565 STA 54279¢0570 LDA #62 ;SDMCTL=SGL LINE¢0575 STA 559¢0580 LDA #1 ;GRPRIOR¢0585 STA 623¢0590 STA 752 ;CURSOR OFF¢0595 LDA ELVT ;GET LVL 1 SPD¢0600 STA ELVL ;STORE IN PGM¢0605 LDA #$31 ;INIT MSGS¢0610 STA LNGM¢0615 STA SPGM¢0620 LDA #14 ;SET UP P/M COL¢0625 STA 704¢0630 STA 705¢0635 STA 706¢0640 LDY #0¢0645 TYA¢0650 BLANKPM¢0655 STA $4300,Y ;CLR M1-4¢0660 STA $4400,Y ; P0¢0665 STA $4500,Y ; P1¢0670 STA $4600,Y ; P2¢0675 INY¢0680 BNE BLANKPM ;DONE ALL 256?¢0685 LDX #32 ;Y:X=OFSET TO M0¢0690 LDA #$80¢0695 STA X ;INIT CRSHR POS¢0700 STA Y¢0705 FM STA $4300,X ;FILL M3¢0710 INX¢0715 CPX #224 ;BOT OF SCREEN?¢0720 BCC FM ;N:CONT FILL¢0725 LDX #0 ;Y:INIT STR COLS¢0730 STX CTR¢0735 OLP¢0740 LDY #0¢0745 ILP¢0750 LDA C,Y ;GET LUM FROM TBL¢0755 STA LT,X ;STORE IN BIG TBL¢0760 INX¢0765 INY¢0770 CPY #8 ;DONE W/SML TBL?¢0775 BCC ILP ;N:KEEP XFER¢0780 INC CTR ;Y:NXT GRP¢0785 LDA CTR¢0790 CMP #24 ;DONE W/SCREEN?¢0795 BCC OLP ;N:XFER SML TBL¢0800 LDA #0 ;Y:BLK BCKGROUND¢0805 STA 710¢0810 TAX¢0815 FILL¢0820 LDA $D20A¢0825 STA HPOS,X ;RND STAR HPOS¢0830 INX¢0835 CPX #192 ;DONE 192?¢0840 BCC FILL ;N:MORE RND HPOS¢0845 LDA 560 ;Y:SET UP DLI¢0850 STA $C0 ; LINE¢0855 LDA 561¢0860 STA $C1¢0865 LDY #2¢0870 LDA ($C0),Y¢0875 ORA #$80¢0880 STA ($C0),Y¢0885 LDA #SVBI&255 ;ADR FOR SETUP¢0890 STA $0228 ; COUNTDOWN TIMER¢0895 LDA #SVBI/256 ; ROUTINE¢0900 STA $0229¢0905 LDA #DLI&255 ;DLI ADR¢0910 STA 512¢0915 LDA #DLI/256¢0920 STA 513¢0925 LDX #0¢0930 INITE¢0935 LDA $D20A¢0940 AND #$7F¢0945 CLC¢0950 ADC #60 ;RND ENM X¢0955 STA EX,X¢0960 AND #$3F ;RND ENM MOVE¢0965 STA ELIM,X ; LIMIT¢0970 AND #$03 ;RND ENM DX¢0975 SEC¢0980 SBC #1¢0985 STA EDX,X¢0990 REINITY¢0995 LDA $D20A ;RND ENM Y¢1000 AND #$7F¢1005 CLC¢1010 ADC #46¢1015 STA EY,X¢1020 AND #$03 ;RND ENM DY¢1025 SEC¢1030 SBC #1¢1035 BEQ REINITY ;NO ZERO DY!¢1040 STA EDY,X¢1045 LDA #0 ;MVMENT CTR=0¢1050 STA ECTR,X¢1055 STA ELOCK,X ;UNLOK ENM¢1060 LDA #$FF ;#VECTS MOVED=¢1065 STA NV,X ; NEG:ENM ADVANC¢1070 LDA #5 ;ENM SHP CTR=5=¢1075 STA ESC,X ; SMALLEST FRAME¢1080 LDA #7¢1085 STA EP,X ;TMR PSE=7¢1090 STA ET,X ;TMR=7¢1095 INX¢1100 CPX #3 ;DONE ALL 3 ENM?¢1105 BCC INITE ;N:INIT NEXT¢1110 LDA ERP ;Y:ENM RTN PSE*8=¢1115 ASL A ; ENM FIRING PSE¢1120 ASL A¢1125 ASL A¢1130 STA OKF¢1135 LDA #$70¢1140 STA SHIELD ;INIT SHIELD¢1145 LDA #$99¢1150 STA REM ;INIT REMAINING¢1155 LDA #0 ;POS 0,0¢1160 STA 656¢1165 STA 657¢1170 STA 658¢1175 TAX ;X=IOCB0=SCRN¢1180 LDA #11 ;ICCOM=PUTCHR¢1185 STA $0342¢1190 LDA #SMSG&255 ;ICBADR=SMSG¢1195 STA $0344¢1200 LDA #SMSG/256¢1205 STA $0345¢1210 LDA #158 ;ICBLEN=158¢1215 STA $0348¢1220 STX $0349¢1225 STX $02FF ;NO CTRL-1¢1230 JSR $E456 ;CIOV¢1235 ST LDX #0 ;PSE ABT 1 SEC¢1240 OP¢1245 LDY #0¢1250 IP¢1255 DEY¢1260 BNE IP¢1265 DEX¢1270 BNE OP¢1275 STX $02FF ;NO CTRL-1¢1280 LDA 53279 ;CONSOLE KEY¢1285 CMP #7 ;TOUCHING A KEY?¢1290 BEQ ST¢1295 CMP #5 ;SELECT?¢1300 BNE NSEL¢1305 JMP SELECT¢1310 NSEL CMP #3 ;OPTION?¢1315 BNE NOPT¢1320 JMP OPTION¢1325 NOPT CMP #6 ;START?¢1330 BNE ST¢1335 JMP START¢1340 OPTION¢1345 LDX LN ;INC LEVEL NUMBER¢1350 INX¢1355 CPX #3¢1360 BCC LNS¢1365 LDX #0¢1370 LNS STX LN¢1375 LDA ELVT,X ;GET ENM LVL¢1380 STA ELVL ;STORE IN PGM¢1385 LDA #35 ;POS 33,0¢1390 STA 657¢1395 LDA #0¢1400 STA 658¢1405 STA 656¢1410 STA $0348 ;ICBLEN=0:DATA¢1415 STA $0349 ; STORED IN ACCU.¢1420 LDA #11 ;ICCOM=PUTCHR¢1425 STA $0342¢1430 INX ;CHG LVL TO ASCII¢1435 TXA¢1440 ORA #$30¢1445 STA LNGM ;STORE IN GMSG¢1450 LDX #$00 ;X=IOCB0:SCREEN¢1455 JSR $E456 ;CIOV¢1460 JMP ST ;BACK TO PAUSE¢1465 SELECT¢1470 LDX SP ;INC ENM SPD BY 1¢1475 INX¢1480 CPX #3¢1485 BCC SPS¢1490 LDX #0¢1495 SPS STX SP¢1500 LDA ERPT,X ;GET NEW PAUSE¢1505 STA ERP ; &STORE IN PGM¢1510 LDA #35 ;POS 33,1¢1515 STA 657¢1520 LDA #0¢1525 STA 658¢1530 STA $0348 ;ICBLEN=0:DATA IN¢1535 STA $0349 ; ACCU.¢1540 LDA #1¢1545 STA 656¢1550 LDA #11 ;ICCOM=PUTCHR¢1555 STA $0342¢1560 INX ;CHG SPD TO ASCII¢1565 TXA¢1570 ORA #$30¢1575 STA SPGM ;STORE IN GMSG¢1580 LDX #0 ;X=IOCB0:SCREEN¢1585 JSR $E456 ;CIOV¢1590 JMP ST ;BACK TO PAUSE¢1595 START¢1600 LDX #0 ;POS 0,0¢1605 STX 656¢1610 STX 657¢1615 STX 658¢1620 LDA #11 ;ICCOM=PUTCHR¢1625 STA $342¢1630 LDA #GMSG&255 ;ICBADR=GMSG¢1635 STA $0344¢1640 LDA #GMSG/256¢1645 STA $0345¢1650 LDA #158 ;ICBLEN=158¢1655 STA $0348¢1660 LDA #0¢1665 STA $0349¢1670 JSR $E456 ;CIOV¢1675 LDA #1 ;SET FLAG=PUT¢1680 STA EFLAG ; CRSHAIR ON SCR¢1685 STA $21A ;ENABLE SET RTN¢1690 LDA #192¢1695 STA 54286 ;ENABLE DLI¢1700 MAIN¢1705 LDA $D20F¢1710 AND #$04 ;PRESSNG ANY KEY?¢1715 BNE NOSPACE¢1720 LDA 53769¢1725 CMP #$21 ;PRESSING SPACE?¢1730 BNE NOSPACE¢1735 JSR STPI ;STP ALL INTER.¢1740 KEYED¢1745 LDA $D20F¢1750 AND #$04 ;STILL PRESSING?¢1755 BEQ KEYED¢1760 PAUSED¢1765 LDA $D20F¢1770 AND #$04 ;PRESSING A KEY?¢1775 BNE PAUSED¢1780 LDA 53769¢1785 CMP #$21 ;PRESSING SPACE?¢1790 BNE PAUSED¢1795 RELEASE¢1800 LDA $D20F¢1805 AND #$04 ;STILL PRESSING?¢1810 BEQ RELEASE¢1815 JSR STRI ;RESTART INTER.¢1820 NOSPACE¢1825 LDA #0¢1830 STA 77 ;NO ATTRACT MODE¢1835 LDA $D010 ;FIRE BUTTON?¢1840 BNE EFIRE ;N:ENM'S FIRE¢1845 JMP FIRE ;Y:YOU FIRE¢1850 EFIRE¢1855 LDA OKF ;TIME FOR ENM TO¢1860 BEQ DOEFIRE ; FIRE?¢1865 JMP MAIN¢1870 DOEFIRE¢1875 LDA ERP ;RESTORE ENM FIRE¢1880 ASL A ; CTR¢1885 ASL A¢1890 ASL A¢1895 STA OKF¢1900 LDA $D20A¢1905 ELVL=*+1¢1910 CMP #64 ;FIRE ACCORDING¢1915 BCS MAIN ; TO PROBABILITY¢1920 AND #$03¢1925 CMP #3¢1930 BEQ MAIN¢1935 TAX ;ENEMY # FIRING¢1940 LDA NV,X¢1945 BEQ MAIN ;IF RECEDING,QUIT¢1950 BMI MAIN ;IF ADVANCNG,QUIT¢1955 LDA ELOCK,X¢1960 BNE MAIN ;IF LOCKED,QUIT¢1965 STX EL¢1970 LDA #$20 ;START ENM LASER¢1975 STA $D200 ; SOUND¢1980 LDA #$4F¢1985 STA $D201¢1990 LDA #1 ;LOCK ENEMY¢1995 STA ELOCK,X¢2000 LDA #2 ;COLOR 2¢2005 JSR COLOR¢2010 LDX EL¢2015 LDA EY,X ;CHG ENM PLR Y¢2020 SEC ; INTO GR 7 YPOS¢2025 SBC #26¢2030 LSR A¢2035 PHA¢2040 TAY¢2045 LDA EX,X ;CHG ENM PLR X¢2050 SEC ; INTO GR 7 XPOS¢2055 SBC #45¢2060 PHA¢2065 TAX¢2070 LDA #0¢2075 JSR PLOT ;PLOT¢2080 LDA $D20A ;RND YPOS¢2085 AND #$3F¢2090 CLC¢2095 ADC #8¢2100 TAY¢2105 STA LY¢2110 LDA $D20A ;RND XPOS¢2115 AND #$7F¢2120 CLC¢2125 ADC #16¢2130 TAX¢2135 STA LX¢2140 LDA #0¢2145 JSR DRAWTO ;DRAWTO TO HERE¢2150 LDA #64 ;FLASH SCREEN RED¢2155 STA 712¢2160 STA 710¢2165 LDA #0 ;COLOR 0¢2170 JSR COLOR¢2175 PLA ;START XPOS FOR¢2180 TAX ; LASER¢2185 PLA ;START YPOS FOR¢2190 TAY ; LASER¢2195 LDA #0¢2200 JSR PLOT ;'UNPLOT' THIS PT¢2205 LDA #0 ;END XPOS FOR¢2210 LDX LX ; LASER¢2215 LDY LY ;END YPOS¢2220 JSR DRAWTO ;ERASE LINE¢2225 LDX EL¢2230 LDA #0 ;UNLOCK ENEMY¢2235 STA ELOCK,X¢2240 STA $D200 ;TURN OFF SOUND¢2245 STA $D201¢2250 STA 712 ;BLACKEN SCREEN¢2255 STA 710¢2260 LDA SHIELD¢2265 PHA¢2270 CMP #2¢2275 BCC LOSE ;YOU KILLED?¢2280 JSR STPI¢2285 SED¢2290 PLA¢2295 SEC¢2300 SBC #2 ;DECREASE SHIELD¢2305 STA SHIELD¢2310 PHA¢2315 CLD¢2320 JSR STRI¢2325 LDA #36 ;POS 36,0¢2330 STA 657¢2335 LDA #0¢2340 STA 658¢2345 STA 656¢2350 PLA¢2355 JSR PN ;PRINT NEW SHIELD¢2360 JMP MAIN ;BACK TO MAIN¢2365 LOSE¢2370 LDA #$8F ;DISTORTION,VOL¢2375 STA $D201 ; FOR YOUR EXPL¢2380 STA JLOCK ;LOCK JSTICK¢2385 LDX #$80 ;EXPL DURATION¢2390 LO LDY #0¢2395 LI LDA $D20A¢2400 STA $D200 ;RND FREQ¢2405 STA 712 ;RND COL¢2410 STA 710¢2415 DEY¢2420 BNE LI¢2425 DEX¢2430 BNE LO ;LOOP YOUR EXPL¢2435 STX $D200 ;TURN OFF SOUND¢2440 STX $D201¢2445 STX 712 ;BCK COL=0¢2450 STX 710¢2455 STX 656 ;POS 0,0¢2460 STX 657¢2465 STX 658¢2470 LDA #11¢2475 STA $0342 ;ICCOM=PRNCHR¢2480 LDA #LMSG&255 ;ICBADR=LMSG¢2485 STA $0344¢2490 LDA #LMSG/256¢2495 STA $0345¢2500 LDA #39 ;ICBLEN=39¢2505 STA $0348¢2510 STX $0349¢2515 JSR $E456 ;CIOV¢2520 JMP RES ;WAIT FOR RESTART¢2525 FIRE LDA #$4F ;START YOUR LASER¢2530 STA $D201 ; SOUND¢2535 LDA #1¢2540 STA $D200¢2545 STA JLOCK ;LOCK JOYSTIK¢2550 JSR COLOR ;COLOR 1¢2555 LDA #0¢2560 STA 53278 ;CLR OLD COLL.¢2565 LDX #80¢2570 LDY #79¢2575 JSR PLOT ;PLOT 80,79¢2580 LDA X ;CHG CROSSHAIR X¢2585 SEC ; TO GR.7 XPOS¢2590 SBC #45¢2595 PHA¢2600 TAX¢2605 LDA Y ;CHG CROSSHAIR Y¢2610 SEC ; TO GR.7 YPOS¢2615 SBC #26¢2620 LSR A¢2625 PHA¢2630 TAY¢2635 LDA #0¢2640 JSR DRAWTO ;DRAWTO TO HERE¢2645 LDA #0¢2650 JSR COLOR ;COLOR 0¢2655 LDA #0¢2660 LDX #80¢2665 LDY #79¢2670 JSR PLOT ;ERASE LASER STRT¢2675 PLA ;LASER END Y¢2680 TAY¢2685 PLA ;LASER END X¢2690 TAX¢2695 LDA #0 ;TURN OFF SOUND¢2700 STA $D200¢2705 STA $D201¢2710 JSR DRAWTO ;ERASE LASER¢2715 LDA #0 ;UNLOK JOYSTIK¢2720 STA JLOCK¢2725 LDA $D008 ;CHECK FOR ANY¢2730 BEQ CH2 ; COLLISIONS¢2735 JSR HIT¢2740 CH2 LDA $D009¢2745 BEQ CH3¢2750 JSR HIT¢2755 CH3 LDA $D00A¢2760 BEQ NOHIT¢2765 JSR HIT¢2770 NOHIT¢2775 JMP EFIRE ;LET ENM FIRE¢2780 HIT¢2785 BIT ONE ;HIT P0?¢2790 BEQ ONEOK¢2795 LDX #0¢2800 JSR EXPLODE¢2805 ONEOK¢2810 BIT TWO ;HIT P1?¢2815 BEQ TWOOK¢2820 LDX #1¢2825 JSR EXPLODE¢2830 TWOOK¢2835 BIT FOUR ;HIT P2?¢2840 BEQ FOUROK¢2845 LDX #2¢2850 JSR EXPLODE¢2855 FOUROK¢2860 RTS¢2865 EXPLODE¢2870 PHA ;SAVE COLL REG¢2875 TXA ;SAVE WHICH ENM¢2880 PHA ; TO EXPLODE¢2885 LDA ELOCK,X ;ENM LOCKED?¢2890 BEQ CANEXP¢2895 PLA¢2900 PLA¢2905 RTS¢2910 CANEXP PLA ;RESTORE WHICH TO¢2915 PHA ; EXPL.&SAVE AGN¢2920 CLC ;GET WHICH PLR¢2925 ADC #$44 ; BAND TO USE¢2930 STA EXPADR¢2935 LDA #1 ;LOCK ENEMY¢2940 STA ELOCK,X¢2945 LDA EY,X ;GET ENM YPOS¢2950 TAY¢2955 LDX #0¢2960 EXPLP¢2965 LDA EXPSHP,X ;PUT EXPLOSION¢2970 EXPADR=*+2¢2975 STA $FF00,Y¢2980 INX¢2985 INY¢2990 CPX #12 ;ALL 12?¢2995 BCC EXPLP¢3000 PLA¢3005 TAX¢3010 LDA #60 ;KEEP THIS EXPL.¢3015 STA EXPCTR,X ; ON FOR 1 SEC¢3020 JSR STPI ;STP INT¢3025 SED¢3030 LDA REM¢3035 SEC¢3040 SBC #1¢3045 STA REM ;REM=REM-1(DEC)¢3050 LDA SHIELD¢3055 CMP #$99¢3060 BEQ NOIS¢3065 CLC¢3070 ADC #1¢3075 STA SHIELD ;SHIELD=SHIELD+1¢3080 NOIS CLD¢3085 JSR STRI ;STR INT¢3090 LDA REM¢3095 PHA¢3100 CMP #3 ;>=3 LEFT?¢3105 BCS CANR¢3110 LDA #0 ;CANT RESTORE¢3115 JMP STORR¢3120 CANR LDA #1 ;CAN RESTORE¢3125 STORR STA R,X¢3130 PLA¢3135 BEQ WIN ;IF KILL ALL,WIN!¢3140 LDY #36 ;POS 36,1¢3145 STY 657¢3150 LDY #0¢3155 STY 658¢3160 LDY #1¢3165 STY 656¢3170 JSR PN ;PRNT #REMAINING¢3175 LDA #36 ;POS 36,0¢3180 STA 657¢3185 LDA #0¢3190 STA 658¢3195 STA 656¢3200 LDA SHIELD¢3205 JSR PN ;PRINT NEW SHIELD¢3210 PLA ;RESTORE COL REG¢3215 RTS ;BACK TO CALLER¢3220 WIN LDX #0 ;POS 0,0¢3225 STX 656¢3230 STX 657¢3235 STX 658¢3240 LDA #11 ;ICCOM=PUTCHR¢3245 STA $342¢3250 LDA #WMSG&255 ;ICBADR=WMSG¢3255 STA $344¢3260 LDA #WMSG/256¢3265 STA $345¢3270 LDA #79 ;ICBLEN=79¢3275 STA $348¢3280 STX $349¢3285 JSR $E456 ;CIOV¢3290 RES LDA 53279 ;PRESSING START?¢3295 CMP #6¢3300 BNE RES¢3305 JMP $E474 ;'PRESS' RESET¢3310 PN PHA¢3315 LSR A ;GET HIGH NIBBLE¢3320 LSR A¢3325 LSR A¢3330 LSR A¢3335 JSR CA ;PRINT¢3340 PLA¢3345 AND #$0F ;GET LOW NBL&PRT¢3350 CA ORA #$30 ;CHG TO ASCII¢3355 LDX #11 ;ICCOM=PUTCHR¢3360 STX $342¢3365 LDX #0 ;ICBLEN=0=DATA IN¢3370 STX $348 ; ACCU.¢3375 STX $349¢3380 JMP $E456 ;CIOV¢3385 STPI¢3390 LDA #$80 ;STOP INTERRUPTS¢3395 STA $D40E¢3400 SEI¢3405 RTS¢3410 STRI LDA #$C0 ;ENABLE INTER.'S¢3415 STA $D40E¢3420 CLI¢3425 RTS¢3430 SVBI¢3435 LDA #DVBI&255 ;ENABLE DEF VBI¢3440 STA $0224¢3445 LDA #DVBI/256¢3450 STA $0225¢3455 LDA #IVBI&255 ;ENABLE IMM VBI¢3460 STA $0222¢3465 LDA #IVBI/256¢3470 STA $0223¢3475 LDA #CRTN&255 ;ENABLE CTDN TMR¢3480 STA $0228 ; ROUTINE¢3485 LDA #CRTN/256¢3490 STA $0229¢3495 LDA #1¢3500 STA $021A¢3505 RTS¢3510 CRTN¢3515 LDA #0¢3520 STA $02FF ;NO CTRL-1¢3525 INC 708 ;PULSE YOUR LASER¢3530 LDA OKF ;UPDATE OKF (ENM¢3535 BEQ NUOKF ; FIRE CTR)¢3540 DEC OKF¢3545 NUOKF¢3550 LDX #2¢3555 CKEXP¢3560 LDA EXPCTR,X ;ENM EXPLODING?¢3565 BEQ NXEXP¢3570 DEC EXPCTR,X ;DEC EXPL CTR¢3575 BEQ STPEXP ;IF DONE EXP,STOP¢3580 LDA #$20 ;ELSE,KEEP EXPL¢3585 STA $D202 ; SOUND ON¢3590 LDA #$0F¢3595 STA $D203¢3600 NXEXP DEX¢3605 BPL CKEXP ;DONE ALL ENM'S?¢3610 LDA #1 ;RESET CTDN TMR¢3615 STA $21A¢3620 RTS¢3625 STPEXP¢3630 TXA¢3635 PHA¢3640 CLC ;GET WHICH PLR¢3645 ADC #$44 ; BAND TO USE¢3650 STA EREXAD¢3655 LDA EY,X¢3660 TAY¢3665 LDA #0¢3670 STA $D202 ;STOP EXPL SOUND¢3675 STA $D203¢3680 TAX¢3685 EREX¢3690 EREXAD=*+2¢3695 STA $FF00,Y ;ERASE EXPL¢3700 INX¢3705 INY¢3710 CPX #12 ;DONE ERASING?¢3715 BCC EREX¢3720 PLA¢3725 TAX¢3730 LDA $D20A ;RND XPOS¢3735 AND #$7F¢3740 CLC¢3745 ADC #60¢3750 STA EX,X¢3755 LDA $D20A ;RND YPOS¢3760 AND #$7F¢3765 CLC¢3770 ADC #46¢3775 STA EY,X¢3780 LDA #$FF ;ENEMY=ADVANCING¢3785 STA NV,X¢3790 LDA #0¢3795 STA 53278 ;NO COLL W/EXPL.¢3800 LDA #5 ;ENEMY=STARTS¢3805 STA ESC,X ; OUT SMALL¢3810 LDA #7¢3815 STA ET,X ;ENM TMR=7¢3820 STA EP,X ;ENM TMR PSE=7¢3825 LDA R,X¢3830 BEQ NOU ;CAN WE UNLOK?¢3835 LDA #0¢3840 STA ELOCK,X ;UNLOK¢3845 NOU JMP NXEXP ;NXT EXPL.¢3850 DVBI¢3855 INC S1 ;STAR1 CTR=..+1¢3860 INC S2 ; 2¢3865 INC S3 ; 3¢3870 INC S4 ; 4¢3875 INC S5 ; 5¢3880 INC S6 ; 6¢3885 INC S7 ; 7¢3890 INC S8 ; 8¢3895 LDX #0¢3900 PAUSE¢3905 LDA S1,X ;NEED TO RESET¢3910 CMP PS,X ; THIS CTR?¢3915 BCC SKIP¢3920 LDA #0 ;RESET CTR¢3925 STA S1,X¢3930 JSR DECS ;AND MOV THE STRS¢3935 CPX #1¢3940 BCS SKIP¢3945 JSR DECS¢3950 SKIP¢3955 INX ;NEXT LEVEL¢3960 CPX #8 ;DONE ALL 8 LVLS?¢3965 BCC PAUSE¢3970 JMP $E462 ;RET TO SYSTEM¢3975 DECS¢3980 *=*+72 ;DEC STRS IN LYR¢3985 RTS ; (CREATED RTNE)¢3990 DLI¢3995 PHA ;SAVE REGS¢4000 TXA¢4005 PHA¢4010 TYA¢4015 PHA¢4020 DLII¢4025 *=*+2880 ;SET STR HPOS,LUM¢4030 PLA ;RESTORE REGS¢4035 TAY¢4040 PLA¢4045 TAX¢4050 PLA¢4055 RTI¢4060 IVBI¢4065 LDA JLOCK ;LOCKED JOYSTIK?¢4070 BEQ JMOVE¢4075 JMP ERTN¢4080 JMOVE¢4085 LDX #1¢4090 CHECKJOY¢4095 LDA #15 ;GET 15-STICK(0)¢4100 SEC¢4105 SBC 632¢4110 BIT ONE ;UP?¢4115 BEQ NOTONE¢4120 LDY Y¢4125 CPY #32 ;IS Y AT TOP?¢4130 BCC NOTONE¢4135 DEC Y ;DEC Y TWICE¢4140 DEC Y¢4145 STX EFLAG ;FLAG-REDRAW¢4150 NOTONE¢4155 BIT TWO ;DOWN?¢4160 BEQ NOTTWO¢4165 LDY Y¢4170 CPY #182 ;IS Y AT BOT?¢4175 BCS NOTTWO¢4180 INC Y ;INC Y TWICE¢4185 INC Y¢4190 STX EFLAG ;FLAG-REDRAW¢4195 NOTTWO¢4200 BIT FOUR ;LEFT?¢4205 BEQ NOTFOUR¢4210 LDY X¢4215 CPY #50 ;IS X LEFTMOST?¢4220 BCC NOTFOUR¢4225 DEC X ;DEC X TWICE¢4230 DEC X¢4235 NOTFOUR¢4240 BIT EIGHT ;RIGHT?¢4245 BEQ NOTEIGHT¢4250 LDY X¢4255 CPY #201 ;IS X RTMOST?¢4260 BCS NOTEIGHT¢4265 INC X ;INC X TWICE¢4270 INC X¢4275 NOTEIGHT¢4280 LDX X ;UPDATE XPOS¢4285 STX $D004¢4290 INX¢4295 INX¢4300 STX $D005¢4305 INX¢4310 INX¢4315 STX $D006 ;STORE IN HPOSM2¢4320 LDA EFLAG ;NEED TO REDRAW?¢4325 BEQ ERTN ;N:MOVE ENEMIES¢4330 LDA #0 ;Y:REDRAW CROSS-¢4335 STA EFLAG ; HAIR¢4340 TAX¢4345 LDY Y¢4350 PUTLOOP¢4355 LDA $4300,Y ;GET OLD MBYTE¢4360 AND #$C0 ;SAVE ONLY M3¢4365 ORA PSHAP,X ;FORCE IN C-HAIR¢4370 STA $4300,Y ;STORE FINAL BYT¢4375 INX¢4380 INY¢4385 CPX #12 ;DONE ALL 12?¢4390 BCC PUTLOOP¢4395 ERTN¢4400 LDA #0¢4405 STA EC¢4410 STA $C0 ;($C0)=PTR TO PLR¢4415 LDA #$44 ; BAND CURRENTLY¢4420 STA $C1 ; IN USE¢4425 LDX EC¢4430 ELOOP¢4435 LDA ELOCK,X ;ENEMY LOCKED?¢4440 BEQ CKTM¢4445 JMP NEXENM¢4450 CKTM DEC ET,X ;DEC ENM'S TIMER¢4455 BEQ DOTHISENM ;IF ZERO,MOVE HIM¢4460 JMP NEXENM ;ELSE DO NEXT ENM¢4465 DOTHISENM¢4470 LDA EP,X ;RESET THIS ENM'S¢4475 STA ET,X ; TIMER¢4480 LDA NV,X ;GET #VECTRS MOVD¢4485 BEQ DSAPPR ;ZERO=DSAPPR¢4490 BMI APPEAR ;NEG#=APPEAR¢4495 JMP CONTERTN ;POS#=MOVING¢4500 DSAPPR¢4505 STA CTR¢4510 LDA ESC,X¢4515 CMP #5¢4520 BCS SETAPR ;DONE DISAPPRING?¢4525 ASL A¢4530 CLC¢4535 ADC ESC,X¢4540 ASL A¢4545 ASL A¢4550 LDY EY,X ;Y=PTR TO ENM PLR¢4555 TAX ;X=PTR 2 ESHP TBL¢4560 RECLP¢4565 LDA ESHAP,X ;GET SHAPE BYTE¢4570 STA ($C0),Y ;STORE IT IN P0¢4575 INX¢4580 INY¢4585 INC CTR¢4590 LDA CTR¢4595 CMP #12¢4600 BCC RECLP¢4605 LDX EC¢4610 INC ESC,X ;NEXT FRAME¢4615 JMP NEXENM ;NXT ENM¢4620 SETAPR¢4625 LDA #$FF ;#VECT CTR=NEG #:¢4630 STA NV,X ; ENM WILL APPEAR¢4635 LDA EY,X¢4640 CLC¢4645 ADC #5¢4650 STA EY,X¢4655 TAY¢4660 LDA #0 ;ERASE ENEMY¢4665 STA ($C0),Y¢4670 LDA $D20A ;RND ENM XPOS¢4675 AND #$7F¢4680 CLC¢4685 ADC #60¢4690 STA EX,X¢4695 LDA $D20A ;RND ENM YPOS¢4700 AND #$7F¢4705 CLC¢4710 ADC #46¢4715 STA EY,X¢4720 JMP NEXENM ;NXT ENM¢4725 APPEAR¢4730 DEC ESC,X¢4735 BMI DNAPPR ;DONE APPEARING?¢4740 LDA ESC,X¢4745 ASL A¢4750 CLC¢4755 ADC ESC,X¢4760 ASL A¢4765 ASL A¢4770 LDY EY,X ;Y=PTR TO ENM PLR¢4775 TAX ;X=PTR TO SHP TBL¢4780 LDA #0¢4785 STA CTR¢4790 APLP¢4795 LDA ESHAP,X ;GET ENM SHP BYT¢4800 STA ($C0),Y ;PUT IT IN PLR¢4805 INX¢4810 INY¢4815 INC CTR¢4820 LDA CTR ;DONE 12 BYTES?¢4825 CMP #12¢4830 BCC APLP¢4835 LDX EC¢4840 LDA EX,X ;GET ENM'S XPOS¢4845 STA $D000,X ;STORE IN HPOS¢4850 JMP NEXENM ;NXT ENM¢4855 DNAPPR¢4860 LDA $D20A ;RND MAX # VECTRS¢4865 AND #$07¢4870 CLC¢4875 ADC #4¢4880 STA MNV,X¢4885 ERP=*+1¢4890 LDA #1¢4895 STA ET,X ;ENM TMR=1¢4900 STA EP,X ;ENM TMR PSE=1¢4905 LDA #1¢4910 STA NV,X ;#VETCS MOVED=1¢4915 JMP NEXENM ;NXT ENM¢4920 CONTERTN¢4925 LDA EX,X ;ENM'S X=..+DX¢4930 CLC¢4935 ADC EDX,X¢4940 STA EX,X¢4945 CMP #48 ;OFF LEFT EDGE?¢4950 BCC CEDIR¢4955 CMP #201 ;OFF RIGHT EDG?¢4960 BCS CEDIR¢4965 LDA EY,X ;ENM Y=..+DY¢4970 CLC¢4975 ADC EDY,X¢4980 STA EY,X¢4985 CMP #186 ;OFF BOT EDGE?¢4990 BCS CEDIR¢4995 CMP #33 ;OFF TOP EDGE?¢5000 BCC CEDIR¢5005 INC ECTR,X ;N:INC CTR 4 ENM¢5010 LDA ECTR,X ;HAS IT MOVED¢5015 CMP ELIM,X ; THE LIMIT?¢5020 BCS CEDIR¢5025 PUTENM¢5030 LDY EY,X ;Y=PTR TO ENM PLR¢5035 LDX #0 ;X=PTR TO SHP TBL¢5040 PUTELP¢5045 LDA ESHAP,X ;GET ENM SHAPBYT¢5050 STA ($C0),Y ;STORE IN ENM PLR¢5055 INY¢5060 INX¢5065 CPX #12 ;DONE ALL 12?¢5070 BCC PUTELP¢5075 LDX EC¢5080 LDA EX,X ;GET ENM XPOS¢5085 STA $D000,X ;STORE IN HPOS¢5090 NEXENM INC $C1 ;NXT PLR BAND¢5095 INC EC ;NXT ENM CTR¢5100 LDX EC ;DONE W/ALL 3¢5105 CPX #3 ; ENMS?¢5110 BCS RETIMM¢5115 JMP ELOOP ;CONT W/NXT ENM¢5120 RETIMM¢5125 JMP $E45F ;BACK TO SYSTEM¢5130 CEDIR¢5135 LDA EY,X ;RESTORE ENM YPOS¢5140 SEC¢5145 SBC EDY,X¢5150 STA EY,X¢5155 LDA EX,X ;RESTORE ENM XPOS¢5160 SEC¢5165 SBC EDX,X¢5170 STA EX,X¢5175 INC NV,X ;#VECTS MVED=..+1¢5180 LDA NV,X ;LIMIT YET?¢5185 CMP MNV,X¢5190 BCC CNTCEDIR¢5195 LDA #0 ;NV=0:FLAG-ENM¢5200 STA NV,X ; WILL RECEDE¢5205 STA ESC,X ;RSET ENM SHP CTR¢5210 LDA #7¢5215 STA ET,X ;ENM TMR=7¢5220 STA EP,X ;ENM TMR PSE=7¢5225 JMP NEXENM ;UPDATE NXT ENM¢5230 CNTCEDIR¢5235 LDA #0 ;RESET MVEMNT CTR¢5240 STA ECTR,X¢5245 LDA 53770 ;SET A NEW¢5250 AND #$3F ; MOVEMENT LIMIT¢5255 STA ELIM,X¢5260 LDA EX,X¢5265 BPL POSEDX ;IF X=LF,DX=RT¢5270 BMI NEGEDX ;IF X=RT,DX=LF¢5275 NEWEDY LDA EY,X¢5280 BPL POSEDY ;IF Y=UP,DY=DN¢5285 BMI NEGEDY ;IF Y=DN,DY=UP¢5290 JMP PUTENM ;DRAW SHAPE¢5295 POSEDX¢5300 JSR GETPOS ;GET RND ENM +DX¢5305 STA EDX,X¢5310 JMP NEWEDY¢5315 NEGEDX¢5320 JSR GETNEG ;GET RND ENM -DX¢5325 STA EDX,X¢5330 JMP NEWEDY¢5335 POSEDY¢5340 JSR GETPOS ;GET RND ENM +DY¢5345 STA EDY,X¢5350 JMP PUTENM¢5355 NEGEDY¢5360 JSR GETNEG ;GET RND ENM -DY¢5365 STA EDY,X¢5370 JMP PUTENM¢5375 GETPOS¢5380 LDA 53770 ;GET RND 1-3¢5385 AND #$03¢5390 BEQ GETPOS¢5395 RTS¢5400 GETNEG¢5405 LDA 53770 ;GET RND -1 TO -3¢5410 AND #$03¢5415 BEQ GETNEG¢5420 EOR #$FF¢5425 CLC¢5430 ADC #1¢5435 RTS¢5440 ONE¢5445 .BYTE 1 ;FOR 'BIT' INSTR.¢5450 TWO¢5455 .BYTE 2 ; SAME¢5460 FOUR¢5465 .BYTE 4 ; SAME¢5470 EIGHT¢5475 .BYTE 8 ; SAME¢5480 Y¢5485 .BYTE 0 ;CROSSHAIR Y¢5490 X¢5495 .BYTE 0 ;CROSSHAIR X¢5500 EFLAG¢5505 .BYTE 0 ;C-HAIR REDRAW FLAG¢5510 PSHAP¢5515 .BYTE $00,$00,$0C,$0C,$0C,$3F,$3F,$0C,$0C,$0C,$00,$00 ;CRSSHAIR SHAPE¢5520 C¢5525 .BYTE 14,12,10,8,8,6,4,2 ;STARS' COLOR (LUMINANCE) TABLE¢5530 S1¢5535 .BYTE 0 ;CTR FOR STAR LAYER 1¢5540 S2¢5545 .BYTE 0 ; 2¢5550 S3¢5555 .BYTE 0 ; 3¢5560 S4¢5565 .BYTE 0 ; 4¢5570 S5¢5575 .BYTE 0 ; 5¢5580 S6¢5585 .BYTE 0 ; 6¢5590 S7¢5595 .BYTE 0 ; 7¢5600 S8¢5605 .BYTE 0 ; 8¢5610 PS¢5615 .BYTE 1,1,2,3,4,6,9,14 ;STR SPD¢5620 CTR¢5625 .BYTE 0 ;MISC COUNTER¢5630 DLIP¢5635 .BYTE $AD ;"LDA ABSOLUTE"¢5640 PHPOS¢5645 .WORD HPOS ; ADR FOR LDA¢5650 .BYTE $AC ;"LDY ABSOLUTE"¢5655 PLT¢5660 .WORD LT ;ADR FOR LDY¢5665 .BYTE $8D,$0A,$D4 ;STA WSYNC¢5670 .BYTE $8D,$07,$D0 ;STA HPOSM3¢5675 .BYTE $8C,$15,$D0 ;STY COLRM3¢5680 EX¢5685 .BYTE 0,0,0 ;ENEMY XPOS TABLE¢5690 EY¢5695 .BYTE 0,0,0 ;ENEMY YPOS TABLE¢5700 ESHAP¢5705 .BYTE 0,0,0,0,146,186,254,198,0,0,0,0¢5710 .BYTE 0,0,0,0,146,254,198,0,0,0,0,0¢5715 .BYTE 0,0,0,0,84,124,68,0,0,0,0,0¢5720 .BYTE 0,0,0,0,0,56,0,0,0,0,0,0¢5725 .BYTE 0,0,0,0,0,16,0,0,0,0,0,0¢5730 EDX¢5735 .BYTE 0,0,0 ;ENEMY DX TABLE¢5740 EDY¢5745 .BYTE 0,0,0 ;ENEMY DY TABLE¢5750 ECTR¢5755 .BYTE 0,0,0 ;# STEPS TRAVELED¢5760 ELIM¢5765 .BYTE 0,0,0 ;MAX # STEPS TO XVL¢5770 NV¢5775 .BYTE 0,0,0 ;#VECTORS TRAVELED¢5780 MNV¢5785 .BYTE 0,0,0 ;MAX VECTS TO XVEL¢5790 ESC¢5795 .BYTE 0,0,0 ;ENM SHAPE CTR¢5800 EP¢5805 .BYTE 0,0,0 ;ENM TIMER PAUSES¢5810 ET¢5815 .BYTE 0,0,0 ;ENM TIMERS¢5820 EC¢5825 .BYTE 0 ;CTR FOR ENM MVEMNT¢5830 JLOCK¢5835 .BYTE 0¢5840 ELOCK¢5845 .BYTE 0,0,0 ;ENM 'LOCK' STATUS¢5850 EL¢5855 .BYTE 0 ;ENEMY FIRING LASER¢5860 LX¢5865 .BYTE 0 ;LASER TERMINAL X¢5870 LY¢5875 .BYTE 0 ;LASER TERMINAL Y¢5880 EXPSHP¢5885 .BYTE 20,64,10,160,4,17,132,33,4,80,2,40 ;EXPLOS SHAPE¢5890 EXPCTR¢5895 .BYTE 0,0,0 ;EXPLOSION COUNTER¢5900 OKF¢5905 .BYTE 0 ;ENM OK2FIRE CTR¢5910 ELVT¢5915 .BYTE 64,128,192 ;ENM LVL TBL¢5920 ERPT¢5925 .BYTE 3,2,1 ;ENM RTN PAUSE TBL¢5930 LN¢5935 .BYTE 0 ;LEVEL #¢5940 SP¢5945 .BYTE 0 ;ENEMY SPEED¢5950 SMSG¢5955 .BYTE " ááááחמשĲצחנמáááá OPTION-Level:1 "¢5960 .BYTE " ááááììììììììáááá SELECT-Speed:1 "¢5965 .BYTE " áΓ∙´áמ∩≥ϕβ∈áכΘ∈á START -Play Game "¢5970 .BYTE " áááá¿π⌐áõ¨ÕÕáááá SPACE -Pause "¢5975 GMSG¢5980 .BYTE " ááááחמשĲצחנמáááá Shield Energy:70 "¢5985 .BYTE " ááááììììììììáááá Enemies Left :99 "¢5990 LNGM=*+37¢5995 .BYTE " áΓ∙´áמ∩≥ϕβ∈áכΘ∈á Level Number : 1 "¢6000 SPGM=*+37¢6005 .BYTE " áááá¿π⌐áõ¨ÕÕáááá Enemy Speed : 1 "¢6010 WMSG¢6015 .BYTE " ááááחמשĲצחנמáááá וננגáטנאíךנרáתחמí "¢6020 .BYTE " ááááììììììììáááá ¡¡®ספדצצáצקĲפק¶¡¡ "¢6025 LMSG¢6030 .BYTE " ááááחמשĲצחנמááááYOU LOSE-PUSH START "¢6035 SHIELD .BYTE 0 ;SHIELD ENERGY¢6040 REM .BYTE 0 ;#ENM LEFT¢6045 R .BYTE 0,0,0 ;ENM UNLOCK FLAG¢6050 GRAPHICS¢6055 PHA ;SAVE ORIG. #¢6060 LDX #$60 ;IOCB 6(SCREEN)¢6065 LDA #12 ;CLOSE #6¢6070 STA $342,X ;(JUST TO BE¢6075 JSR $E456 ; SAFE!)¢6080 LDA #3 ;OPEN #6¢6085 STA $342,X ;COMMAND #¢6090 LDA #SCRDEV&255 ;ADDR OF "S:"¢6095 STA $344,X ;LO BYTE¢6100 LDA #SCRDEV/256 ;AND NOW THE¢6105 STA $345,X ; HI BYTE¢6110 LDA #1 ;LENGTH OF SCRN¢6115 STA $348,X ; I.D. IS ONLY¢6120 LDA #0 ; ONE CHARACTER¢6125 STA $349,X ; (THE 'S')¢6130 PLA ;GET IT BACK¢6135 PHA ;BUT STILL SAVE¢6140 EOR #16 ;REVERSE BIT 5¢6145 AND #16 ;KEEP ONLY BIT 5¢6150 CLC ;ADD 12 TO IT¢6155 ADC #12¢6160 STA $34A,X ;=ICAX1 SPEC¢6165 PLA ;ORIG. MODE #=¢6170 STA $34B,X ; ICAX2 SPEC¢6175 JMP $E456 ;AND JMP TO CIO!¢6180 COLOR¢6185 STA COLNUM ;STORE IT FOR¢6190 RTS ; LATER USE¢6195 POSITION¢6200 STY 84 ;VERT POS¢6205 STX 85 ;HOR POS LO BYTE¢6210 STA 86 ;HOR POS HI BYTE¢6215 RTS ;BYE!¢6220 PLOT¢6225 JSR POSITION ;POSITION CURSOR¢6230 LDX #$60 ;SCREEN (IOCB6)¢6235 LDA #11 ;PUT CHARS COMD¢6240 STA $342,X ;STORE IN ICCOM¢6245 LDA #$00 ;BUFLEN OF ZERO¢6250 STA $348,X ; MEANS GET/PUT¢6255 STA $349,X ; DATA TO/FROM¢6260 ; THE ACCUM.¢6265 LDA COLNUM ;PUT COLOR # IN¢6270 ; ACCU B/C LEN=0¢6275 JMP $E456 ;JMP TO CIO¢6280 DRAWTO¢6285 JSR POSITION ;POSITION CURSR¢6290 LDX #$60 ;SCRN (IOCB6)¢6295 LDA #17 ;DRAW LINE CMD¢6300 STA $342,X ;STORE IN ICCOM¢6305 LDA #0 ;ZERO BUF LEN¢6310 STA $348,X ; B/C NO DATA¢6315 STA $349,X ; IS XFERRED!¢6320 LDA COLNUM ;STORE COL # IN¢6325 STA $02FB ; 2FB FOR CIO¢6330 JMP $E456 ;AND GO TO CIO¢6335 SCRDEV¢6340 .BYTE "S" ;SCREEN I.D.¢6345 COLNUM¢6350 BRK ;COLOR# STORAGE¢6355 HPOS¢6360 *=*+192 ;TBL STR POS¢6365 LT¢6370 *=*+192 ;TBL STR LUM¢6375 *=$02E0¢6380 .WORD BP ;DOS RUN ADR¢