Fred Nachbaur’s Christmas present to his customers in 1987.
This one’s claim to fame is that it used the SHREB package, but most of the program runs in machine-code, demonstrating that the SHREB package is a useful library of graphics routines as well as a BASIC extension. This program has a bug that’s so charming I left it in. If you sideswipe an invader, it kills it but it doesn’t vaporise… it just sort of hangs there in space. The same bug also causes occasional rocket shrapnel to stay in place. Warning; this game is addictive, and hard to beat.
Source Code
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1 REM 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2 REM \A2\A0\96\A8\B4\B1\80\B5\B7\AE\B3\B9\76\76\00\00\00\00\00\00\00\00\7E\A5\42\A5\81\7E\24\42\FF\24\42\A5\81\7E\42\24\24\42\24\3C\42\A5\81\7E\81\42\24\3C\42\A5\99\7E\42\C3\BD\E7\FF\BD\24\66\81\C3\BD\E7\C3\BD\42\66\3C\42\A5\81\5A\24\42\24\3C\42\A5\99\42\3C\42\81\3C\5A\A5\DB\DB\A5\5A\3C\00\FF\55\AA\55\00\FF\00\18\18\3C\66\5A\FF\E7\C3\18\18\3C\24\7E\42\FF\81\01\03\06\0F\19\3F\66\FF\99\FF\66\FF\99\FF\66\FF\80\C0\60\F0\98\FC\66\FF\1F\1F\3D\3E\7D\78\FF\00\F8\F8\7C\BC\5E\1E\FF\00\10\38\38\28\38\28\7C\44\28\38\38\38\38\38\10\00\00\03\1F\74\DB\F4\FF\81\00\C0\F8\2E\DB\2F\FF\81\00\00\00\7C\00\00\00\00\00\10\54\38\38\54\10\00\00\04\08\10\20\40\80\00\00\00\10\00\00\10\10\20\00\00\00\00\00\10\10\20\00\00\00\00\00\30\30\00\00\38\4C\54\54\64\38\00\00\30\50\10\10\10\7C\00\00\38\44\04\38\40\7C\00\00\7C\04\18\04\44\38\00\00\08\18\28\48\7C\08\00\00\7C\40\78\04\44\38\00\00\38\40\78\44\44\38\00\00\7C\04\08\10\20\20\00\00\38\44\38\44\44\38\00\00\38\44\44\3C\04\38\00\00\38\44\44\7C\44\44\00\00\78\44\78\44\44\78\00\00\38\44\40\40\44\38\00\00\70\48\44\44\48\70\00\00\7C\40\78\40\40\7C\00\00\7C\40\78\40\40\40\00\00\38\44\40\4C\44\38\00\00\44\44\7C\44\44\44\00\00\38\10\10\10\10\38\00\00\18\08\08\48\48\30\00\00\44\48\70\50\48\44\00\00\40\40\40\40\40\7C\00\00\44\6C\54\54\44\44\00\00\44\64\54\4C\44\44\00\00\38\44\44\44\44\38\00\00\78\44\44\78\40\40\00\00\38\44\44\54\48\34\00\00\78\44\44\78\48\44\00\00\38\40\38\04\44\38\00\00\7C\10\10\10\10\10\00\00\44\44\44\44\44\38\00\00\44\44\44\44\28\10\00\00\A0\AA\AA\AA\EE\AA\00\00\A0\AA\4A\44\AA\AA\00\00\A0\AA\4A\46\42\42\04\00\E0\2E\42\44\88\EE\00\E5\21\94\30\19\EB\E1\3A\DB\3F\E6\80\3A\C1\3F\0F\06\08\C5\F5\1A\46\28\2C\38\1C\E6\F0\F5\78\E6\0F\47\F1\B0\77\13\D5\11\20\00\19\D1\F1\C1\10\E3\C1\0C\ED\43\C1\3F\C9\CB\3F\CB\3F\CB\3F\CB\3F\F5\78\E6\F0\18\DC\38\0A\CB\27\CB\27\CB\27\CB\27\18\CC\E6\0F\18\EA 3 REM \00\02\04\06\00\02\04\06\00\04\02\06\00\04\02\06\00\02\00\04\02\06\04\06\00\06\02\04\06\00\04\02\00\00\00\06\09\01\00\00\00\00\00\00\00\00\00\00\00\00\F5\C5\D5\79\0E\00\51\58\CB\38\CB\19\CB\38\CB\19\CB\38\CB\19\81\4F\2A\0C\40\23\09\19\D1\C1\F1\C9\E5\CD\20\51\77\E1\C9\E5\D5\C5\F5\3E\02\30\06\3A\C6\3F\0F\3E\04\CB\11\32\C0\3F\CB\20\CB\20\CB\20\ED\43\C1\3F\F1\F5\CD\72\46\F1\C1\D1\E1\C9\CD\40\51\18\D4\21\00\38\E5\11\94\4E\01\E0\01\ED\B0\E1\11\00\3E\01\48\00\ED\B0\C9\CB\FF\37\CD\47\51\CB\BF\E5\D5\C5\F5\18\CF\3A\F3\3F\3C\E6\03\32\F3\3F\07\07\07\16\00\5F\21\EE\50\19\22\F4\3F\C9\A7\F5\CD\0B\52\AF\CD\6E\51\69\CB\05\CB\05\CB\05\3E\18\90\07\07\07\3D\67\22\C3\3F\3A\C7\3F\A7\3A\C8\3F\0F\20\07\0C\2C\2C\2C\2C\18\05\0D\2D\2D\2D\2D\30\05\04\25\25\25\25\F1\C5\38\0B\CB\47\28\03\3C\18\01\3D\CD\40\51\CD\0C\42\CD\0C\4B\ED\4B\C3\3F\CD\A0\4A\C1\C9\2A\C3\3F\37\F5\18\BE\17\17\17\16\00\5F\21\00\3E\19\22\D8\3F\21\00\00\22\DC\3F\C9\00\FD\CB\78\CE\CD\73\51\AF\32\C8\3F\32\C7\3F\16\1E\01\01\00\3C\CD\45\52\3E\01\32\C7\3F\57\01\1E\00\CD\45\52\18\E2\C5\D5\CD\AE\51\C5\CD\04\52\CD\BB\02\2C\C1\D1\20\13\CD\20\51\5E\79\BA\7B\20\E7\C1\04\04\C6\02\FE\09\D0\18\DC\C1\C1\C9\CD\6C\56\7D\2E\00\FE\F7\20\01\2D\FE\EF\20\01\2C\3A\FC\3F\85\A7\28\07\FE\1F\30\03\32\FC\3F\7D\32\C9\3F\AF\CB\0C\3F\17\32\CA\3F\C9\06\17\1E\00\0E\1F\CD\79\53\30\02\1C\50\0D\FA\AA\52\18\F3\05\F2\9B\52\7A\ED\53\F6\3F\3E\10\32\FC\3F\C9\00\00\00\00\00\00\3A\FC\3F\3D\4F\06\15\AF\CD\6E\51\0C\3E\0B\CD\6E\51\0C\AF\CD\6E\51\18\95\3A\C9\3F\A7\C8\ED\44\57\3D\F5\3E\01\32\C6\3F\3A\FC\3F\82\4F\06\15\AF\CD\47\51\F1\3A\FC\3F\4F\28\01\0D\3E\0B\C3\89\51\3A\FD\3F\4F\0D\06\00\FE\1E\20\13\AF\CD\6E\51\0C\CD\6E\51\AF\0C\CD\6E\51\ED\5F\32\FD\3F\C9\38\05\3C\32\FD\3F\C9\A7\28\04\AF\CD\6E\51\0C\3E\14\CD\6E\51\0C\3E\15\C3\6E\51\3A\FD\3F\4F\06\00\FE\1E\D0\3C\32\FD\3F\AF\CD\47\51\3C\32\C6\3F\3E\14\CD\89\51\0C\3C\C3\89\51\48\04\21\00\20\54\58\75\ED\B0\18\B5\3A\C7\3F\A7\3A\C8\3F\0F\ED\4B\11\51\30\05\C2\25\54\18\51\20\72\18\0A\00\CD\20\51\7E\A7\C8\FE\09\C9\0C\0C\79\FE\20\30\0A\CD\79\53\30\F5\ED\43\11\51\C9\3A\10\51\3C\FE\08\28\14\32\10\51\5F\16\00\2A\F4\3F\19\46\3A\F7\3F\80\47\0E\FF\18\D4\3E\01\32\C8\3F\3A\F7\3F\3C\32\F7\3F\C6\05\47\3E\04\0E\FF\32\13\51\0C\79\FE\20\30\07\CD\79\53\30\F5\18\BC\3A\13\51\3D\28\04\05\05\18\E4\AF\32\C8\3F\3C\32\C7\3F\3E\07\18\13\0D\0D\FA\F4\53\CD\79\53\30\F7\18\9A\3A\10\51\3D\FA\0F\54\32\10\51\5F\16\00\2A\F4\3F\19\46\3A\F7\3F\80\47\0E\20\18\DA\3E\01\32\C8\3F\3A\F7\3F\3C\32\F7\3F\C6\05\47\3E\04\0E\20\32\13\51\0D\FA\31\54\CD\79\53\30\F7\C3\8E\53\3A\13\51\3D\28\04\05\05\18\E5\AF\32\C8\3F\32\C7\3F\C3\9B\53\3A\FA\3F\A7\C0\3A\CA\3F\A7\C8\3A\FC\3F\4F\06\14\ED\43\FA\3F\3E\12\C3\6E\51\00\00\F5\C5\D5\E5\3A\34\40\3D\FD\BE\34\20\FA\E1\D1\C1\F1\C9\00\ED\4B\FA\3F\0C\0D\C8\05\F2\89\54\AF\47\CD\6E\51\4F\ED\43\FA\3F\C9\ED\43\FA\3F\04\CD\20\51\7E\FE\12\28\12\FE\0B\28\0E\C5\AF\21\E3\3F\06\10\77\23\10\FC\C1\18\04\AF\CD\6E\51\05\CD\20\51\7E\A7\20\05\3E\12\C3\6E\51\FE\13\28\5B\FE\14\28\67\FE\15\28\63\FE\09\30\EB\3C\CB\3F\ED\44\C6\05\57\87\87\87\82\82\CD\E8\54\3A\F6\3F\3D\32\F6\3F\01\00\00\ED\43\FA\3F\C9\C5\F5\3E\09\A7\CD\47\51\F1\2A\FE\3F\06\00\4F\09\22\FE\3F\CD\50\55\01\00\17\AF\CD\20\51\1E\05\7E\CD\47\51\23\0C\1D\20\F7\C1\AF\C3\6E\51\00\00\00\3E\03\CD\E8\54\CD\E0\54\01\00\15\ED\43\F8\3F\C9\3E\C8\CD\E8\54\CD\E0\54\3E\04\CD\60\54\ED\5B\57\41\13\13\06\20\F5\CD\94\4B\CD\60\54\CD\60\54\F1\3D\20\EA\C3\55\53\00\00\E5\01\00\17\CD\F5\08\E1\E5\1E\1C\01\F0\D8\CD\E1\07\CD\AD\0A\C9\00\3A\F8\3F\A7\C0\ED\5F\FE\A0\D0\ED\4B\11\51\78\FE\10\D0\04\CD\79\53\38\F6\FE\12\C8\ED\43\F8\3F\C9\ED\4B\F8\3F\0C\0D\C8\AF\32\CB\3F\CD\79\53\30\06\32\CB\3F\04\18\F5\FE\12\CA\18\55\FE\0B\20\12\3E\09\CD\6E\51\3E\40\CD\60\54\3D\20\FA\C1\01\00\01\C9\78\FE\15\28\2D\3A\CB\3F\A7\20\05\AF\CD\6E\51\04\CD\79\53\38\FA\FE\12\CA\18\55\FE\0B\28\D0\57\78\FE\15\CA\20\55\3E\13\A7\ED\43\F8\3F\CD\6E\51\7A\A7\C8\AF\CD\6E\51\C3\20\55\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\3E\FF\32\F3\3F\CD\97\52\AF\32\10\51\CD\97\51\21\FF\02\FD\74\78\22\11\51\21\00\00\22\C7\3F\22\F8\3F\22\FA\3F\00\00\00\CD\61\53\CD\AE\51\CD\BF\52\CD\73\54\CD\86\55\CD\FE\52\CD\45\54\CD\04\52\CD\D7\52\CD\73\54\CD\86\55\CD\36\53\CD\66\55\3A\12\51\FE\14\30\0A\3A\F6\3F\A7\20\CC\01\00\02\C9\3A\FC\3F\4F\06\15\C5\C3\A5\55\00\00\00\3A\21\40\A7\20\04\2A\25\40\C9\26\FE\DB\1D\CB\57\20\04\2E\F7\18\06\CB\5F\20\02\2E\EF\CB\67\C8\25\C9\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00 5 FAST 7 REM \:'\''\''\''\''\''\''\''\''\''\''\''\''\''\''\''\''\''\''\''\''\''\': \: %S%P%A%C%E% %I%N%V%A%D%E%R%S% %-% %S%R%A%M\ : \: BY FRED NACHBAUR 1987\ : \:.\..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\.: 8 REM %*%M%E%R%R%Y% %C%H%R%I%S%T%M%A%S%* FROM SILICON MOUNTAIN COMPUTERS 10 SLOW 11 PRINT "USE %KEYBOARD OR %ZEBRA JOYSTICK?" 12 LET S$=INKEY$ 13 IF S$<>"K" AND S$<>"Z" THEN GOTO 12 14 POKE 16417,S$="Z" 15 CLS 16 PRINT "BE SURE SRAM IS ENABLED BEFORE PROCEEDING....." 17 IF INKEY$="" THEN GOTO 17 20 LET S$="\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~\~~" 25 LET HR=19400 29 REM %I%N%V%A%D%E%R% %U%D%G%S 30 IF USR HR THEN LPRINT U;" ";"00,00,00,00,00,00,00,00,7E,A5,42,A5,81,7E,24,42,FF,24,42,A5,81,7E,42,24,24,42,24,3C,42,A5,81,7E,81,42,24,3C,42,A5,99,7E,42,C3,BD,E7,FF,BD,24,66,81,C3,BD,E7,C3,BD,42,66,3C,42,A5,81,5A,24,42,24,3C,42,A5,99,42,3C,42,81" 39 REM %O%T%H%E%R% %U%D%G%S 40 IF USR HR THEN LPRINT U;"\,,";"3C,5A,A5,DB,DB,A5,5A,3C,00,FF,55,AA,55,00,FF,00,18,18,3C,66,5A,FF,E7,C3,18,18,3C,24,7E,42,FF,81,01,03,06,0F,19,3F,66,FF,99,FF,66,FF,99,FF,66,FF,80,C0,60,F0,98,FC,66,FF,1F,1F,3D,3E,7D,78,FF,00,F8,F8,7C,BC,5E,1E,FF,00" 49 REM %R%O%C%K%E%T%/%B%U%L%L%E%T 50 IF USR HR THEN LPRINT U;">";"10,38,38,28,38,28,7C,44,28,38,38,38,38,38,10,00" 59 REM %M%O%T%H%E%R%S%H%I%P% %-%*%/ 60 IF USR HR THEN LPRINT U;"=";"00,03,1F,74,DB,F4,FF,81,00,C0,F8,2E,DB,2F,FF,81,00,00,00,7C,00,00,00,00,00,10,54,38,38,54,10,00,00,04,08,10,20,40,80,00" 69 REM %N%U%M%B%E%R%S 70 IF USR HR THEN LPRINT U;"0";"00,38,4C,54,54,64,38,00,00,30,50,10,10,10,7C,00,00,38,44,04,38,40,7C,00,00,7C,04,18,04,44,38,00,00,08,18,28,48,7C,08,00,00,7C,40,78,04,44,38,00,00,38,40,78,44,44,38,00,00,7C,04,08,10,20,20,00,00,38,44,38,44,44,38,00,00,38,44,44,3C,04,38,00,00" 79 REM %A%L%P%H%A% %A%-%M 80 IF USR HR THEN LPRINT U;"A";"00,38,44,44,7C,44,44,00,00,78,44,78,44,44,78,00,00,38,44,40,40,44,38,00,00,70,48,44,44,48,70,00,00,7C,40,78,40,40,7C,00,00,7C,40,78,40,40,40,00,00,38,44,40,4C,44,38,00,00,44,44,7C,44,44,44,00,00,38,10,10,10,10,38,00,00,18,08,08,48,48,30,00,00,44,48,70,50,48,44,00,00,40,40,40,40,40,7C,00,00,44,6C,54,54,44,44,00,00" 89 REM %A%L%P%H%A% %N%-%Z 90 IF USR HR THEN LPRINT U;"N";"00,44,64,54,4C,44,44,00,00,38,44,44,44,44,38,00,00,78,44,44,78,40,40,00,00,38,44,44,54,48,34,00,00,78,44,44,78,48,44,00,00,38,40,38,04,44,38,00,00,7C,10,10,10,10,10,00,00,44,44,44,44,44,38,00,00,44,44,44,44,28,10,00,00,44,44,54,54,6C,44,00,00,44,28,10,28,44,44,00,00,44,44,28,10,10,10,00,00,7C,08,10,20,40,7C,00,00" 100 IF USR HR THEN CLS 102 IF USR HR THEN RUN 105 IF USR HR THEN RAND 107 POKE 16320,2 109 REM %C%O%V%E%R%-%S%C%R%E%E%N 110 CLS 112 POKE 16418,0 115 PRINT AT 1,0;;;;S$,,"** S P A C E I N V A D E R S **",,S$ 120 PRINT ,,TAB 13;"POINTS",,,TAB 5;"< 3";TAB 22;"\## 10";TAB 15;"£";TAB 5;"\.' 20";TAB 14;"$:?";TAB 22;"\. 30";TAB 13;"(\~~\~~\~~)";TAB 5;"\' 40";TAB 22;"=+ 200" 125 PRINT ,,"1-5 MOVE LEFT --- MOVE RIGHT 6-0",,TAB 8;"SHIFT --- FIRE",,,,,"PRESS ANY KEY TO START INVASION<",,S$ 126 PRINT "1/2-SPEED TRAINER MODE - PRESS T" 128 IF USR HR THEN RAND 31 130 IF USR HR THEN LIST 136 POKE 16382,0 138 POKE 16383,0 139 REM %"%P%A%T%R%O%L%"% %D%E%M%O 140 IF USR HR THEN LPRINT SS;1 150 RAND USR 21024 160 LET S=(INKEY$="T") 170 IF USR HR THEN LPRINT SS;S 180 IF NOT USR HR THEN CLS 200 FOR L=3 TO 0 STEP -1 230 GOSUB 2000 239 REM %M%A%G%I%C% %M%A%C%H%I%N%E%-%C%O%D%E 240 GOTO USR 22016 256 CLS 258 FOR N=1 TO 3 260 IF USR HR THEN RAND 265 IF USR HR THEN RAND 31 267 NEXT N 270 NEXT L 279 REM %E%N%D% %O%F% %G%A%M%E 280 IF USR HR THEN PRINT AT 80,0;;;;S$;"><><>< G A M E -- O V E R <><><>";S$;"-P- ---- PLAY AGAIN -Q- ---- END OFF ",,S$ 282 IF USR HR THEN PAUSE 4E4 285 IF INKEY$="Q" THEN GOTO 300 290 IF INKEY$="P" THEN RUN 295 GOTO 282 300 CLS 310 IF USR HR THEN RETURN 320 IF USR HR THEN CLS 330 STOP 512 IF USR HR THEN PRINT AT 0,0;;;; 520 FOR N=1 TO 43 530 IF USR HR THEN PRINT "-- SUPER -- BONUS "; 535 IF USR HR THEN RAND 31 540 NEXT N 545 CLS 550 RAND 1000+PEEK 16382+256*PEEK 16383 560 POKE 16382,PEEK 16434 565 POKE 16383,PEEK 16435 570 GOSUB 2000 580 GOTO USR 22021 2000 REM %S%E%T% %U%P% %S%C%R%E%E%N 2005 IF USR HR THEN CLS 2010 POKE 16418,0 2030 PRINT AT 2,2;"\' \ ' \' \ ' \' \ ' \' \ ' \' ";AT 4,2;"\'' \. \'' \. \'' \. \'' \. \''";AT 6,2;"\: \.' \: \.' \: \.' \: \.' \: ";AT 8,2;"\:' \## \:' \## \:' \## \:' \## \:'";AT 22,0;S$ 2040 LET F$="00000"+STR$ (PEEK 16382+256*PEEK 16383) 2050 PRINT F$(LEN F$-4 TO );TAB 26; 2060 FOR N=1 TO L 2065 PRINT (CHR$ 11+" "); 2070 NEXT N 2075 PRINT AT 18,5;"£";TAB 16;"£";TAB 26;"£";TAB 4;"$:?";TAB 15;"$\,,?";TAB 25;"$\~~?";TAB 3;"=\~~\~~\~~+";TAB 14;"(\~~\~~\~~)";TAB 24;"(:::)" 2080 POKE 16320,2 2085 IF USR HR THEN LLIST 2090 RETURN 9000 SAVE "INVADER%S" 9010 RUN G000 REM \76\76\ED\4F\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\80\C3\4B\41