A.N.A.L.O.G. ISSUE 36 / NOVEMBER 1985 / PAGE 39

Maze War

24K Cassette or Disk

by Mark Price

Our story so far…The evil Mage Roklar must have more backing than you thought, because somehow he captured you and, the other members of the Circle of Wizards. You really don’t know how long you were out, but when you awoke, you found yourselves in a tenuous construct.

From its mazelike pattern, it was immediately recognized to be one of Roklar’s favorite disposal places, a pocket dimension bridging between the elemental planes of fire and ice. It was then that Roklar made his projected appearance before the group.

His image said, “You have all stood in my way too long. Now it is my turn to stand in yours. This area will not last long, and there is only enough magical energy here to carry but one of you away! Knowing how you always so adamantly refuse to part company, though, I doubt that any of you will escape.” The image laughed wickedly as it faded away.

After a quick survey of the area, you found that Roklar had spoken the truth for once. The place itself was beginning to fray at the edges as its remaining magic seeped away. Very soon, there wouldn’t be enough to take any of you back home.

Obviously, only one of you would be able to escape to make Roklar pay, so it was decided to hold a quick tourney to find which it would be. It was lucky that you had finished constructing your Wands of Havoc before being captured. They would serve excellently for the tourney. You all drew them from your vests and prepared.

Then Roklar reappeared. This time he said, “I never thought I’d see you so prepared to abandon and certainly not threaten violence to each other. No matter. Since you are being so amiable, I’ll make this a little more interesting…”

There was a low rumble some distance away in the maze, and then the slow shuffling of feet coming your way. You looked at each other and, all at the same moment, said, “Zombies?” Roklar never did have a sense of humor.

Typing it in.

Before typing anything, look at the listings accompanying this article.

Listing 1 is the BASIC data and data checking routine. This listing is used to create both cassette and disk versions of Maze War. The data statements are listed in hexadecimal (base 16), so the program will fit in 16K cassette systems.

Listing 2 is the assembly language source code for the game of Maze War, created with the OSS MAC/65 assembler. You don’t have to type this listing to play the game! It is included for those readers interested in assembly language.

Follow the instructions below to make either a cassette or disk version of Maze War.

Cassette instructions.

  1. Type Listing 1 into your computer using the BASIC cartridge and verify your typing with Unicheck (see page 16).
  2. Type RUN and press RETURN. The program will begin and ask:
    MAKE CASSETTE (0) OR DISK (1)? Type 0 and press RETURN. The program will begin checking the DATA statements, printing the line number of each as it goes. It will alert you if it finds any problems. Fix any incorrect lines and re-RUN the program, if necessary, until all errors are eliminated.
  3. When all of your DATA lines are correct, the computer will beep twice and prompt you to READY CASSETTE AND PRESS RETURN. Now, insert a blank cassette in your recorder, press the RECORD and PLAY buttons simultaneously and hit RETURN. The message WRITING FILE will appear, and the program will create a machine language boot tape version of Maze War, printing each DATA line number as it goes. When the READY prompt appears, the game is recorded and ready to play. CSAVE the BASIC program onto a separate tape before continuing.
  4. To play, rewind the tape created by the BASIC program to the beginning. Turn your computer OFF and remove all cartridges. Press the PLAY button on your recorder and turn ON your computer while holding down the START key. If you have a 600 or 800XL computer, you must hold the START and OPTION keys when you turn on the power. The computer will “beep” once. Hit the RETURN key, and Maze War will load and run automatically.

Disk instructions.

  1. Type Listing 1 into your computer, using the BASIC cartridge and verify your typing with Unicheck (see page 16).
  2. Type RUN and press RETURN. The program will ask:
    MAKE CASSETTE (0) OR DISK (1)? Type 1 and press RETURN. The program will begin checking the DATA lines, printing the line number of each statement as it goes. It will alert you if it finds any problems. Fix incorrect lines and re-RUN the program, if necessary, until all errors are eliminated.
  3. When all the DATA lines are correct, you will be prompted to INSERT DISK WITH DOS, PRESS RETURN. Put a disk containing DOS 2.0S into drive #1 and press RETURN. The message WRITING FILE will appear, and the program will create an AUTORUN.SYS file on the disk, displaying each DATA line number as it goes. When the READY prompt appears, the game is ready to play. Be sure the BASIC program is SAVEd before continuing.
  4. To play the game, insert the disk containing the AUTORUN.SYS file into drive #1. Turn your computer OFF, remove all cartridges and turn the computer back ON. Maze War will load and run automatically.

Playing Maze War.

Maze War was written using the OSS MAC/65 assembler.

It’s a game for one to four players. If played on an XL computer with more than two players selected, stick 1 will control Wizards 1 and 3, while stick 2 controls Wizards 2 and 4. The number of players is chosen with the SELECT key, and the number of Zombies with the OPTION key. The speed of the Zombies is selected by pressing a key from 1 to 9.

You start the game somewhere in Roklar’s maze, Havoc Wand in hand. You move about in the maze by pushing your joystick in the desired direction. If the stick is held diagonally, the Wizard will alternate moving between the two directions.

The Wand fires off a magic chain when you hold down the fire button while moving the joystick. The magic chain fired by the Wand is capable of vaporizing man or wall at fifty paces. Once vaporized, a Wizard or Zombie will automatically coalesce back into a whole at a random point somewhere in the maze.

Moving about in the maze will attune you more to its energies, thus making the point value for a hit worth more. In the same fashion, using the Havoc Wand uses up energy, and overuse will bring the point value down. Once a Wizard or Zombie has tapped into 100 points of energy, the spell to return to Earth is cast. Then, the pocket dimension will become unstable and dissolve.

Maze War will go into an automatic demo mode with three Zombies going at it after thirty seconds. This can be seen earlier if you press the D key. Once the game has started, it can be paused by hitting any key Unpause by pressing a key again. The game can be aborted at any time by hitting one of the console keys.

All right, face the magic.

Mark Price lives in Los Angeles, where he’s studying computer science. A telecommunications enthusiast, he participates in several local BBSs. He likes to program games in cooperation with his living computer, Fred, and has been working with computers since 1979.

Listing 1.
BASIC Listing

10 REM *** MAZE WAR ***
20 GRAPHICS 0:TRAP 20:? "MAKE CASSETTE (0), OR DISK (1)";:INPUT DSK:IF DSK>1 THEN 20
30 TRAP 40000:DATA 0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0,0,10,11,12,13,14,15
40 DIM DAT$(91),HEX(22):FOR X=0 TO 22:READ N:HEX(X)=N:NEXT X:LINE=990:RESTORE 1000:TRAP 120:? "CHECKING DATA"
50 LINE=LINE+10:? "LINE:";LINE:READ DAT$:IF LEN(DAT$)<>90 THEN 220
60 DATLIN=PEEK(183)+PEEK(184)*256:IF DATLIN<>LINE THEN ? "LINE ";LINE;" MISSING!":END 
70 FOR X=1 TO 89 STEP 2:D1=ASC(DAT$(X,X))-48:D2=ASC(DAT$(X+1,X+1))-48:BYTE=HEX(D1)*16+HEX(D2)
80 IF PASS=2 THEN PUT #1,BYTE:NEXT X:READ CHKSUM:GOTO 50
90 TOTAL=TOTAL+BYTE:IF TOTAL>999 THEN TOTAL=TOTAL-1000
100 NEXT X:READ CHKSUM:IF TOTAL=CHKSUM THEN 50
110 GOTO 220
120 IF PEEK(195)<>6 THEN 220
130 IF PASS=0 THEN 170
140 IF  NOT DSK THEN 160
150 PUT #1,224:PUT #1,2:PUT #1,225:PUT #1,2:PUT #1,207:PUT #1,36:CLOSE #1:END 
160 FOR X=1 TO 57:PUT #1,0:NEXT X:CLOSE #1:END 
170 IF  NOT DSK THEN 200
180 ? "INSERT DISK WITH DOS, PRESS RETURN";:DIM IN$(1):INPUT IN$:OPEN #1,8,0,"D:AUTORUN.SYS"
190 PUT #1,255:PUT #1,255:PUT #1,0:PUT #1,32:PUT #1,158:PUT #1,53:GOTO 210
200 ? "READY CASSETTE AND PRESS RETURN";:OPEN #1,8,128,"C:":RESTORE 230:FOR X=1 TO 40:READ N:PUT #1,N:NEXT X
210 ? :? "WRITING FILE":PASS=2:LINE=990:RESTORE 1000:TRAP 120:GOTO 50
220 ? "BAD DATA: LINE ";LINE:END 
230 DATA 0,44,216,31,255,31,169,0,141,47,2,169,60,141,2,211,169,0,141,231,2,133,14,169,56,141,232,2
240 DATA 133,15,169,207,133,10,169,36,133,11,24,96
1000 DATA 00000000000000000028561400000000003CBF28000000000000000020BCBC301058582020BCBC301058582000,797
1010 DATA 0000000303033F3303030FC0C00FFCC0C0303C0000000000000000000000000000000000000000000000000000,84
1020 DATA 0000000000000000000000000000000000000000000000000000000000000000000000000000007E666666667E,744
1030 DATA 000018181818181800007E067E60667E00007E061E06667E0000606C6C7E0C0C00007E607E06667E00007E607E,258
1040 DATA 66667E00007E060C18181800007E667E66667E00007E667E06667E0000001818001818008D366C492CD2B64B00,59
1050 DATA 0000002CD2B64B8D366C4900000000000000020A2BAF3C00028AABEFCC00005E5B5E55E5B5E55500183C66667E,492
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1100 DATA 0000C00000C000E7663C1818183C00FECC183060C6FE80B0B2BAAAAEBE3000020AEBAFBEFAC3A0BEFAEBAABFF0,824
1110 DATA C088BABABBBABBBB33000080A0BCA0280F030303153101010AC0C0055C404010283C3C30141434102803030315,115
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1130 DATA A0000000000000000000000303031500000000C0C0C0541111010A000000004C10280000000000000000000000,598
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1150 DATA 14141C04280303301501010428C0C0C054444440A001153104280000004054444040A0000000000000C0C44454,466
1160 DATA 3101010A00000000401028000000000000000303011531040000C0C040544440C0C44454401028000000000000,52
1170 DATA 000000030F3FFFFEFCFCFFFFFFFF80000000FFFFFFFF0F0F0F0FCF00C0C0C0C0C0C0C0FFFFFFFFFFFEFEFFF0F8,451
1180 DATA FCFE3F1F0F07070F0F0F0F8FCFEF80C0C0C0C0C0C0C0F8FCFCFCFCFEFFFF00000000000000803FFFFFFFFEFCFC,935
1190 DATA FEFFFFFF8000000000FFFFFF0F0F0F0F0FFFFFFF800000000FFFFFFF00000000FF00C0C00000000000FFFFFFFF,254
1200 DATA FFFFFF3FFFFFC0E0F0F8F8F0EFCF0F0F0F0C0C07C0C0C0C0C0C0C08083C1E0E0E0E0E080FFFFFF7F3F1C0C07C0,744
1210 DATA E0F0F8FCFFFFFF0000000000FFFCFF000000000080C0800080C0E0F0FFFFFF0F0F0F0F0FFCFCFF0783C0E0F0FF,115
1220 DATA FFFFFFFF0F0F0FFCFCFFAAFEFEAAEFEFAAFEFEAAEFEFAAFEFEAAEFEFAAFEFEAAEFEF0000007C18181400000000,435
1230 DATA 18180810000000007E1818140000000018180810000000007E181410000000007E182808000000007E18141000,343
1240 DATA 0000007E182808000000003E1818280000000018181008000000007E1818280000000018181008000000187E18,223
1250 DATA 1410000000187E182808000000187E181410000000187E1828080000007C181814000000030000000000000000,108
1260 DATA 000000003618181002400000001C66751C0C180C00386ED7FE181018003C7EFFFFDB1818183C7EFFFFFF3C3C3C,432
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1290 DATA 0ED4A90E8D3002A9328D3102A007B9C72499C0028810F7A900A899003C99003D99003E99003F88D0F18D01D28D,533
1300 DATA 03D28D05D28D07D285868587A90A8588A9F4859CA9328598A91A859DA9338599A9028595A90085948590859185,231
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1320 DATA 2C8D01D28D03D2A5872907D020A201B5ACF00620F82D4CCA25D6A8D00AB59449029594A90995A820D12DCA10E2,318
1330 DATA ACFC02A9FF8DFC02B179C931900BC93BB007291F8DAF33D012C964D00EA900858DA903858E4C79264C8B25AD84,579
1340 DATA 02F060AD2E02D0F3AD1FD0C906F05429064906F0E6C906F0E2C902F015EE8E3318AD8E336D7A33C9A59023A950,162
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1360 DATA 205CE4A9018D2E0260204E26AD7A33290F858DAD8E33290F858E18658DC901D004858EA9028589C689A20020E4,364
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1500 DATA 8BA206A48AB1829184C8CAD0F8C8A58B09D09184C8C8C8C8A9D09184A58A186906858AA58418690E85849002E6,485
1510 DATA 85A58BC58CD0CB60A00EA229D004A062A2E4A9074C5CE4A5142907D026AE0021A001B900210A2A858C2901658C,248
1520 DATA 88990021C8C8C008D0EB8A0A2A858C2901658C8D0721A689B5902903F0034C2D2AD6A8F00FB590D0088A0AA8A9,281
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1900 DATA 27A900C89180C891808A0AA8A9009901D260B59C8580B5988581A900A89180C89180B5ACF010B5942901F004A0,493
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1930 DATA B5ACF00A209130F00AB494209C30209130D01F20E42FB59009029590A90995ACE48CF00DA68CB5B81875B495B8,674
1940 DATA A90595B460CA10BDA68C60A584C582D004A585C58360A58238F973318582A583F969318583A582187971318582,495
1950 DATA 9002E68360B5902902D00160B5A40A0A0A692085848A18693C85858A0AA8D6AC3029A90A9900D2848CB4ACB986,417
1960 DATA 31A48C9901D2B5AC290E0A0A699F8582A9248583A007B18291848810F960A9009901D2A00791848810FB4C0E2F,323
1970 DATA B590290F09109590B5BC4902A8B9963195BCA90395C860B5C84A4901186901858AB5C48584B5C08585A48FA584,787
1980 DATA 18796D318584A5857969318585C68AD0ED6048A9C88D16D0A9868D17D0A9588D18D0A9288D19D0684000010000,940
1990 DATA 00FF0000FFFF0228FED802280000FED804030104020404040004040206080C040608080606040404020202030C,862
2000 DATA 030C0804020104182C400000C0C10000C3C5D2D30000C0DE0000DFC2DFDFC6C7C8C9DFD4DFDFDCDDC8C9DFC3C4,638
2010 DATA DFCACBCCCDDFD5D6DFCAD9DADBDFDFC2DFCECFD0D1DFDFD4DFCECFD7D800008182000084008182000000840000,604
2020 DATA 00828100830085000082810000830085009B9C9C9B009D9D9B009D9D009B9C9C7070707070422C320202700670,476
2030 DATA 7005707006700404047006067002410E320000000000000000606162636465666760616263686900006A6B6C63,129
2040 DATA 6A6D6E6F000000000000000000000000000000007071727370747573707172737076777870797A73707B7C7300,346
2050 DATA 00000000000000000000000000000000000000000000232F2D303534292E270000000000000000000000000000,752
2060 DATA 0000000000000000F0F2E5F3E5EEF4F3808080000000000000000000000000000000009E9FA6A8AAB1B6B880BB,723
2070 DATA BCBDBEBF00000000000000000000000000000000223900002D21322B0030322923250000000000000000000000,954
2080 DATA 0000000000000000000000000000000000000000000000000000000000000000FDFDFDFDFDFDFDFDFDFDFDFDFD,243
2090 DATA FDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFE,646
2100 DATA FEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFEFE8080808080F7E9FAE1F2E4F3DA00510000000000000000,841
2110 DATA 00003A2F2D222925331A005000000000000000000000000000000000003A2F2D2229250033302525241A000015,778
2120 DATA 000000000000000000000000707070448E35040404040404040404040404040404040404F046863806060641BC,220
2130 DATA 33A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0000000FDFD00000000000000000000000000A0A000FE00,711
2140 DATA 00FE00FEFEFEFE00FEFEFEFE00FEFEA0A000FF00FFFF000000FF000000FF000000FF00A0A000FD00000000FD00,181
2150 DATA 0000FD000000FD00FD00A0A0FEFE00FEFEFEFEFEFEFEFE00FEFEFE00FE00A0A0000000FF000000000000FF0000,646
2160 DATA 0000000000A0A000FDFDFD00FDFD00FD00FD00FDFDFDFDFDFDA0A0000000000000FE00FE000000FE0000000000,337
2170 DATA A0A0FFFF00FFFF00FF00FF00FFFFFF00FFFFFFFFA0A00000000000000000000000000000FD000000A0A000FEFE,373
2180 DATA FE00FEFEFEFE00FEFEFE00FEFEFE00A0A000FF0000000000000000FF0000000000FF00A0A000FD00FDFDFDFDFD,90
2190 DATA FD000000FDFDFD000000A0A000FE0000FE000000FE00FE0000000000FEFEA0A000FF00FFFF00FF00FF00FFFFFF,306
2200 DATA FFFF000000A0A000FD0000FD00FD00FD00FD000000FDFDFD00A0A0000000000000000000000000FE0000000000,734
2210 DATA A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A0A037293A21322477697A617264B7A9BAA1B2A4F7E9FAE1F2E4,490
2220 DATA 3A2F2D2229257A6F6D626965BAAFADA2A9A5FAEFEDE2E9E537292E330000000000000000000000000000000000,35
2230 REM * 5535 BYTES

Listing 2.
Assembly Listing.

********************
*                  *
*    'MAZE WAR'    *
*        By        *
*    Mark Price    *
*                  *
********************
;
;SYSTEM EQUATES
;--------------
;
ATRACT	=	$4D
AUDCTL	=	$D208
AUDC1	=	$D201
AUDC2	=	$D203
AUDC3	=	$D205
AUDC4	=	$D207
AUDF1	=	$D200
CHBASE	=	$02F4
COLOR0	=	$02C4
COLOR1	=	$02C5
COLOR2	=	$02C6
COLOR3	=	$02C7
COLOR4	=	$02C8
COLPF0	=	$D016
COLPF1	=	$D017
COLPF2	=	$D018
COLPF3	=	$D019
CONSOL	=	$D01F
DLIST	=	$0230
DMACTL	=	$022F
GPRIOR	=	$026F
GRACTL	=	$D01D
HPOSP0	=	$D000
KEYCODES	=	$79
KEYIN	=	$02FC
NMIEN	=	$D40E
PCOLR0	=	$02C0
PCOLR1	=	$02C1
PCOLR2	=	$02C2
PCOLR3	=	$02C3
PMBASE	=	$D407
RANDOM	=	$D20A
RTCLOK	=	$14
SIZEP0	=	$D008
SKCTL	=	$D20F
STICK0	=	$0278
STRIG0	=	$0284
VDSLST	=	$0200
CDTMF5	=	$022E
SETVBV	=	$E45C
XITVBV	=	$E462
;
;PM GRAPHICS
;
	*=	$3800
;
PMAREA	.DS	$0400
PL0	.DS	$0100
PL1	.DS	$0100
PL2	.DS	$0100
PL3	.DS	$0100
;
;COLORS
;
PFCOL0	=	$96
PFCOL1	=	$2A
PFCOL2	=	$00
PFCOL3	=	$34
PLR0COL	=	$C8
PLR1COL	=	$86
PLR2COL	=	$58
PLR3COL	=	$28
;
;ZERO PAGE ALLOCATION
;--------------------
;
	*=	$80
;
;POINTERS
;
POINTR0	.DS	2	;GENL PURPOSE
POINTER	.DS	2
SCRPTR	.DS	2	;SCREEN POINTER
;
;VARIABLES
;
COUNTER	.DS	3	;AUTO DEMO COUNTER
ACTIVE	.DS	1	;NUMBER IN USE
NEAREST	;		ZOMBIE MOVE CLOSE MAN'S #
COUNT	.DS	1	;GENL PURPOSE
DIGITNO	;		SCORE KEEPING
CURLINE	.DS	1	;BOTSCRN LINE NO
HOLDIT	.DS	1	;GENL PURPOSE
PLYRS	.DS	1	;# OF PLAYERS
DIRSHFT	;		BACKLASH DIRECTION REG
DX	;		ZOMBIE MOVE X DIST
SAVEIT	;		WINNER # SAVE
ZMBYS	.DS	1	;# OF ZOMBIES
DIST	;		ZOMBIE MOVE CRNT SHORT DIST
DIREC	.DS	1	;BACKLASH DIRECTION
;
;DATA FOR EACH PLAYER
;
ACTFLAG	.DS	4	;WHAT HE'S DOING
DIR	.DS	4	;DIRECTION POINTING/MOVING
LOCHI	.DS	4	;ABSOLUTE MEM LOC HI
LOCLO	.DS	4	;ABSOLUTE MEM LOC LO
LOCX	.DS	4	;X LOCATION (0-19)
LOCY	.DS	4	;Y LOCATION (0-18)
MOVCLOK	.DS	4	;TIME TILL NEXT MOVE
MOVEST	.DS	4	;STATUS IN MOVE
MOVRATE	.DS	4	;MOVEMENT RATE
NXTSCR	.DS	4	;SCORE FOR NEXT KILL
SCRPND	.DS	4	;SCORE WAITING ADDITION
SHOTDIR	.DS	4	;SHOT MOVE DIRECTION
SHOTHI	.DS	4	;SHOT ABS MEM LOC HI
SHOTLO	.DS	4	;SHOT ABS MEM LOC LO
SHOTMST	.DS	4	;SHOT STATUS IN MOVE
SOUND	.DS	4	;SOUND HOLDING REGISTER
TYPE	.DS	4	;WIZARD=0, ZOMBIE=1
;
	*=	$2000
;
;CHARACTER SET DATA
;------------------
;
CHRSET	.BYTE	0,0,0,0,0,0,0,0	;SPACE
	.BYTE	0,40,86,20,0,0,0,0	;SHOTS
	.BYTE	0,60,191,40,0,0,0,0
	.BYTE	0,0,0,0,32,188,188,48
	.BYTE	16,88,88,32
	.BYTE	32,188,188,48
	.BYTE	16,88,88,32,0,0,0,0
MASKL	.BYTE	3,3,3,63,51
	.BYTE	3,3,15	;COALESCE MASKS
MASKR	.BYTE	192,192,15,252
	.BYTE	192,192,48,60
PL0CHR	.BYTE	0,0,0,0,0,0,0,0
	.BYTE	0,0,0,0,0,0,0,0
	.BYTE	0,0,0,0,0,0,0,0
	.BYTE	0,0,0,0,0,0,0,0
	.BYTE	0,0,0,0,0,0,0,0
	.BYTE	0,0,0,0,0,0,0,0
	.BYTE	0,0,0,0,0,0,0,0
	.BYTE	0,0,0,0,0,0,0,0
	.BYTE	0,126,102,102,102
	.BYTE	102,126,0	;NUMBERS 0
	.BYTE	0,24,24,24
	.BYTE	24,24,24,0	;1
	.BYTE	0,126,6,126
	.BYTE	96,102,126,0	;2
	.BYTE	0,126,6,30
	.BYTE	6,102,126,0	;3
	.BYTE	0,96,108,108
	.BYTE	126,12,12,0	;4
	.BYTE	0,126,96,126
	.BYTE	6,102,126,0	;5
	.BYTE	0,126,96,126
	.BYTE	102,102,126,0	;6
	.BYTE	0,126,6,12
	.BYTE	24,24,24,0	;7
	.BYTE	0,126,102,126
	.BYTE	102,102,126,0	;8
	.BYTE	0,126,102,126
	.BYTE	6,102,126,0	;9
	.BYTE	0,0,24,24
	.BYTE	0,24,24,0	;COLON
	.BYTE	141,54,108,73,44,210
	.BYTE	182,75	;EXPLOSION CHARS
	.BYTE	0,0,0,0,44,210,182,75
	.BYTE	141,54,108,73,0,0,0,0
	.BYTE	0,0,0,2,10
	.BYTE	43,175,60	;TITLE CHAR
	.BYTE	0,2,138,171
	.BYTE	239,204,0,0	;TITLE CHAR
OUTWALL	.BYTE	94,91,94,85,229
	.BYTE	181,229,85	;OUTER WALL
	.BYTE	0,24,60,102,102
	.BYTE	126,102,231	;LETTERS A
	.BYTE	0,252,102,102
	.BYTE	124,102,102,124	;B
	.BYTE	0,126,198,192
	.BYTE	192,192,198,126	;C
	.BYTE	0,252,102,102
	.BYTE	102,102,102,252	;D
	.BYTE	0,254,102,96
	.BYTE	120,96,102,254	;E
	.BYTE	128,176,176,176,178
	.BYTE	186,171,63	;TITLE CHAR
	.BYTE	0,126,198,192
	.BYTE	206,198,198,126	;G
	.BYTE	2,10,42,174,170
	.BYTE	254,194,0	;TITLE CHAR
	.BYTE	0,60,24,24
	.BYTE	24,24,24,60	;I
	.BYTE	42,207,192,194,202
	.BYTE	235,234,207	;TITLE CHAR
	.BYTE	0,206,216,240
	.BYTE	252,204,204,206	;K
	.BYTE	0,240,96,96
	.BYTE	96,96,102,254	;L
	.BYTE	0,99,119,127
	.BYTE	107,99,99,99	;M
	.BYTE	0,198,102,118
	.BYTE	126,126,110,230	;N
	.BYTE	0,124,198,198
	.BYTE	198,198,198,124	;O
	.BYTE	0,252,102,102
	.BYTE	124,96,96,240	;P
	.BYTE	168,235,175,190,240
	.BYTE	192,168,255	;TITLE CHAR
	.BYTE	0,252,102,102
	.BYTE	124,108,108,230	;R
	.BYTE	0,126,198,192
	.BYTE	124,6,198,252	;S
	.BYTE	0,126,90,24
	.BYTE	24,24,24,60	;T
	.BYTE	0,231,102,102
	.BYTE	102,102,102,60	;U
	.BYTE	10,43,175,170
	.BYTE	175,40,10,3	;TITLE CHAR
	.BYTE	0,99,99,99
	.BYTE	107,127,119,99	;W
	.BYTE	0,192,0,0
	.BYTE	192,0,0,192	;TITLE CHAR
	.BYTE	0,231,102,60
	.BYTE	24,24,24,60	;Y
	.BYTE	0,254,204,24
	.BYTE	48,96,198,254	;Z
	.BYTE	128,176,178,186,170
	.BYTE	174,190,48	;TITLE CHAR
	.BYTE	0,2,10,235,175
	.BYTE	190,250,195	;TITLE CHAR
	.BYTE	160,190,250,235,170
	.BYTE	191,240,192	;TITLE CHAR
	.BYTE	136,186,186,187,186
	.BYTE	187,187,51	;TITLE CHAR
	.BYTE	0,0,128,160,188
	.BYTE	160,40,15	;TITLE CHAR
STLCHR	.BYTE	3,3,3,21,49
	.BYTE	1,1,10	;PLAYERS/ZOMBIES
STRCHR	.BYTE	192,192,5,92
	.BYTE	64,64,16,40
	.BYTE	60,60,48,20,20,52,16,40
	.BYTE	3,3,3,21,17,17,1,10
	.BYTE	192,192,12,84
	.BYTE	64,64,16,40
	.BYTE	192,192,192,84
	.BYTE	76,16,40,0
	.BYTE	0,0,3,3,3,21,17,4
	.BYTE	0,0,192,192
	.BYTE	192,84,76,64
	.BYTE	40,0,0,0,0,0,0,0
	.BYTE	64,160,0,0,0,0,0,0
	.BYTE	0,0,0,0,3,3,3,21
	.BYTE	0,0,0,0,192,192,192,84
	.BYTE	17,17,1,10,0,0,0,0
	.BYTE	76,16,40,0,0,0,0,0
	.BYTE	0,0,0,0,0,0,3,3
	.BYTE	0,0,0,0,0,0,192,192
	.BYTE	3,21,17,4,40,0,0,0
	.BYTE	192,84,76,64,64,160,0,0
	.BYTE	3,3,80,53,1,1,4,40
	.BYTE	192,192,192,84
	.BYTE	76,64,64,160
	.BYTE	60,60,12,20,20,28,4,40
	.BYTE	3,3,48,21,1,1,4,40
	.BYTE	192,192,192,84
	.BYTE	68,68,64,160
	.BYTE	1,21,49,4,40,0,0,0
	.BYTE	64,84,68,64,64,160,0,0
	.BYTE	0,0,0,0,192,196,68,84
	.BYTE	49,1,1,10,0,0,0,0
	.BYTE	64,16,40,0,0,0,0,0
	.BYTE	0,0,3,3,1,21,49,4
	.BYTE	0,0,192,192,64,84,68,64
	.BYTE	192,196,68,84
	.BYTE	64,16,40,0
	.BYTE	0,0,0,0,0,0,0,0
	.BYTE	3,15,63,255,254,252
	.BYTE	252,255	;A.N.A.L.O.G.
	.BYTE	255,255,255,128,0
	.BYTE	0,0,255	;CHARACTERS
	.BYTE	255,255,255,15
	.BYTE	15,15,15,207
	.BYTE	0,192,192,192
	.BYTE	192,192,192,192
	.BYTE	255,255,255,255
	.BYTE	255,254,254,255
	.BYTE	240,248,252,254
	.BYTE	63,31,15,7
	.BYTE	7,15,15,15
	.BYTE	15,143,207,239
	.BYTE	128,192,192,192
	.BYTE	192,192,192,192
	.BYTE	248,252,252,252
	.BYTE	252,254,255,255
	.BYTE	0,0,0,0,0,0,0,128
	.BYTE	63,255,255,255
	.BYTE	254,252,252,254
	.BYTE	255,255,255,128
	.BYTE	0,0,0,0
	.BYTE	255,255,255,15
	.BYTE	15,15,15,15
	.BYTE	255,255,255,128
	.BYTE	0,0,0,15
	.BYTE	255,255,255,0
	.BYTE	0,0,0,255
	.BYTE	0,192,192,0,0,0,0,0
	.BYTE	255,255,255,255
	.BYTE	255,255,255,63
	.BYTE	255,255,192,224
	.BYTE	240,248,248,240
	.BYTE	239,207,15,15
	.BYTE	15,12,12,7
	.BYTE	192,192,192,192
	.BYTE	192,192,192,128
	.BYTE	131,193,224,224
	.BYTE	224,224,224,128
	.BYTE	255,255,255,127
	.BYTE	63,28,12,7
	.BYTE	192,224,240,248
	.BYTE	252,255,255,255
	.BYTE	0,0,0,0,0,255,252,255
	.BYTE	0,0,0,0,0,128,192,128
	.BYTE	0,128,192,224
	.BYTE	240,255,255,255
	.BYTE	15,15,15,15
	.BYTE	15,252,252,255
	.BYTE	7,131,192,224
	.BYTE	240,255,255,255
	.BYTE	255,255,15,15
	.BYTE	15,252,252,255
	.BYTE	170,254,254,170
	.BYTE	239,239,170,254	;WALLS
	.BYTE	254,170,239,239
	.BYTE	170,254,254,170
	.BYTE	239,239,170,254
	.BYTE	254,170,239,239
;
;PM IMAGE DATA
;-------------
;
;WIZARD/ZOMBIE "SUITS"
;
SUITS	.BYTE	0,0,0,124,24,24,20,0
	.BYTE	0,0,0,24,24,8,16,0
	.BYTE	0,0,0,126,24,24,20,0
	.BYTE	0,0,0,24,24,8,16,0
	.BYTE	0,0,0,126,24,20,16,0
	.BYTE	0,0,0,126,24,40,8,0
	.BYTE	0,0,0,126,24,20,16,0
	.BYTE	0,0,0,126,24,40,8,0
	.BYTE	0,0,0,62,24,24,40,0
	.BYTE	0,0,0,24,24,16,8,0
	.BYTE	0,0,0,126,24,24,40,0
	.BYTE	0,0,0,24,24,16,8,0
	.BYTE	0,0,24,126,24,20,16,0
	.BYTE	0,0,24,126,24,40,8,0
	.BYTE	0,0,24,126,24,20,16,0
	.BYTE	0,0,24,126,24,40,8
;
;WINNING PLAYER ALL IN PM
;
WINPLYR	.BYTE	0,0,0,124,24,24,20,0
	.BYTE	0,0,3,0,0,0,0,0
	.BYTE	0,0,0,0,0,0,0,54
	.BYTE	24,24,16,2,64,0,0,0
;
;EVAPORATION DATA
;
SMOKE	.BYTE	$1C,$66,$75,$1C
	.BYTE	$0C,$18,$0C,0
	.BYTE	$38,$6E,$D7,$FE
	.BYTE	$18,$10,$18,0
	.BYTE	$3C,$7E,$FF,$FF
	.BYTE	$DB,$18,$18,$18
	.BYTE	$3C,$7E,$FF,$FF
	.BYTE	$FF,$3C,$3C,$3C
	.BYTE	0,$3C,$7E,$7E
	.BYTE	$7E,$3C,$3C,$7E
;
;COLOR DATA
;
COLTBL	.BYTE	$C8,$86,$58,$28
	.BYTE	$96,$2A,$00,$34
;
;
;******************
;** MAIN PROGRAM **
;******************
;
;INITIALIZATIONS
;---------------
;
INIT	LDA	KEYCODES	;CHECK ATASCII
	ORA	KEYCODES+1	;CONVERT TABLE
	BNE	INITPLR	;IF SET, GO ON
	LDA	#$FE	;INIT TO $FEFE
	STA	KEYCODES
	STA	KEYCODES+1
;
INITPLR	LDA	#0	;INIT PLAYERS
	LDX	#3
STWIDTH	STA	SIZEP0,X	;SET WIDTHS
	DEX
	BPL	STWIDTH
	STA	AUDCTL
	STA	COLOR4	;COLOR 4=BLACK
	LDA	# >PMAREA	;SET PMBASE,
	STA	PMBASE	; DMACTL, GRACTL,
	LDA	#$3E	; AND GPRIOR
	STA	DMACTL
	LDA	#$03
	STA	GRACTL
	STA	SKCTL	;INIT SOUND
	LDA	#$01
	STA	GPRIOR
	LDA	# >CHRSET	;SET CHRSET
	STA	CHBASE
	LDA	#$40	;DISABLE DLI
	STA	NMIEN
	LDA	# <DLI	;SET DLI VECTOR
	STA	VDSLST
	LDA	# >DLI
	STA	VDSLST+1
;
;TITLES/GAME OVER ENTRY
;----------------------
;
RESTART	LDA	#$40	;DISABLE DLI
	STA	NMIEN
	LDA	# <TITLDISP	;TURN ON THE
	STA	DLIST	;TITLE DISPLAY
	LDA	# >TITLDISP
	STA	DLIST+1
	LDY	#7	;SET COLORS
SCOL	LDA	COLTBL,Y
	STA	PCOLR0,Y
	DEY
	BPL	SCOL
	LDA	#0	;CLR PM GRAPHICS
	TAY
CLEARPM	STA	PL0,Y
	STA	PL1,Y
	STA	PL2,Y
	STA	PL3,Y
	DEY
	BNE	CLEARPM
	STA	AUDC1	;TURN OFF SOUND
	STA	AUDC2
	STA	AUDC3
	STA	AUDC4
	STA	COUNTER	;INITIALIZE DEMO
	STA	COUNTER+1	;WAIT COUNTER
	LDA	#10	;FOR 30 SECONDS
	STA	COUNTER+2
;
;SETUP TITLE WALKERS
;
	LDA	# <WLKLINE	;SET MEM LOCS
	STA	LOCLO
	LDA	# >WLKLINE
	STA	LOCHI
	LDA	# <WLKLINE+38
	STA	LOCLO+1
	LDA	# >WLKLINE+38
	STA	LOCHI+1
	LDA	#2	;SET DIRECTIONS
	STA	DIR+1
	LDA	#0
	STA	DIR
	STA	ACTFLAG	;SET ACTIONS
	STA	ACTFLAG+1
	STA	MOVEST	;CLR MOVE STATUS
	STA	MOVEST+1
	STA	LOCX	;SET X-LOCATIONS
	LDA	#19
	STA	LOCX+1
	LDA	#15	;AND Y-LOCATIONS
	STA	LOCY
	STA	LOCY+1
	LDA	#10	;SET # OF STEPS
	STA	MOVCLOK
	STA	MOVCLOK+1
	JSR	STIMER
;
;TITLE SCREEN LOOP FOR SELECTIONS
;--------------------------------
;
SELOOP	DEC	COUNTER	;COUNTDOWN TO
	BNE	MVWLKRS	;AUTO DEMO START
	DEC	COUNTER+1
	BNE	MVWLKRS
	DEC	COUNTER+2
	BEQ	STDEMO	;=0 START UP DEMO
;
MVWLKRS	LDA	COUNTER	;MOVE WALKERS
	BNE	CHKKEYS	;EVERY 8TH PASS
	LDA	COUNTER+1
	AND	#$03	;TURN OFF SOUND
	BNE	CHKKEYS	;EVERY 4TH PASS
	STA	AUDC1
	STA	AUDC2
	LDA	COUNTER+1
	AND	#$07
	BNE	CHKKEYS
	LDX	#1	;TWO TO MOVE
MVWLKLP	LDA	MOVEST,X	;GET MOVE STATUS
	BEQ	STWLKMV	;ZERO? START NEW
	JSR	MOVEIM	;ELSE CONTINUE
	JMP	DNXWLKR	;DO NEXT
STWLKMV	DEC	MOVCLOK,X	;COUNT OFF STEP
	BNE	WKSMDIR	;IF >0, SKIP
	LDA	DIR,X	;REVERSE DIR
	EOR	#$02
	STA	DIR,X
	LDA	#9	;RESET STEP CNT
	STA	MOVCLOK,X
WKSMDIR	JSR	INITMVE	;START NEW MOVE
DNXWLKR	DEX		;DO NEXT WALKER
	BPL	MVWLKLP
;
CHKKEYS	LDY	KEYIN	;GET KBD INPUT
	LDA	#$FF	;CLR REG FOR NEXT
	STA	KEYIN
	LDA	(KEYCODES),Y	;ATASCII
	CMP	#49	;"1".."9"?
	BCC	CKDEMO
	CMP	#59
	BCS	CKDEMO
	AND	#$1F	;YES, SET ZOMBIE
	STA	ZOMSPD	;SPEED AND
	BNE	GTCNSL	;CHECK CONSOL
CKDEMO	CMP	#'d	;CHECK FOR "D"
	BNE	GTCNSL	;NO, CHECK CONSOL
STDEMO	LDA	#0	;YES, START DEMO
	STA	PLYRS	;PLAYERS=0
	LDA	#3	;ZOMBIES=3
	STA	ZMBYS
	JMP	SETACT	;AND GO
SEJUMP	JMP	SELOOP
;
GTCNSL	LDA	STRIG0	;START GAME IF
	BEQ	START	;STRIG 0 PRESSED
	LDA	CDTMF5	;SYS TIMER FLAG
	BNE	SEJUMP	;BOUNCE OVER? NO
	LDA	CONSOL	;GET CONSOL KEY
	CMP	#6	;IF START, DO IT
	BEQ	START
	AND	#$06
	EOR	#$06	;INVERT THE REST
	BEQ	SEJUMP	;IF NONE OR BOTH
	CMP	#6	;KEYS PRESSED,
	BEQ	SEJUMP	;LOOP BACK
	CMP	#2	;SELECT PRESSED?
	BEQ	CNGPLYR	;CLANGE #PLYRS
;
	INC	ZOMBIES	;ADD 1 TO # OF
	CLC		;ZOMBIES
	LDA	ZOMBIES	;IF TOTAL ZOMBIES
	ADC	PLAYERS	;AND PLAYERS <5,
	CMP	#$A5	;WE'RE DONE
	BCC	WTCNSL
	LDA	#$50	;ELSE, SET # OF
	STA	ZOMBIES	;ZOMBIES TO ZERO,
	BNE	WTCNSL	;WAIT FOR RELEASE
;
CNGPLYR	INC	PLAYERS	;ADD 1 TO # OF
	LDA	PLAYERS	;PLAYERS
	CMP	#$55	;IF <5, CHECK ON
	BCC	CKZMBIE	;# OF ZOMBIES
	LDA	#$51	;SET # PLAYERS TO
	STA	PLAYERS	;1 AND WAIT FOR
	BNE	WTCNSL	;CONSOL RELEASED
CKZMBIE	CLC		;IF ZOMBIES PLUS
	ADC	ZOMBIES	;PLAYERS>5, WAIT
	CMP	#$A5	;CONSOL RELEASE
	BCC	WTCNSL	;ELSE, DEC # OF
	DEC	ZOMBIES	;ZOMBIES
WTCNSL	JSR	STIMER
	JMP	SELOOP	;GOTO TOP OF LOOP
;
STIMER	LDA	#5	;SET TIMER 5
	LDY	# <40	;2/3 SEC DELAY
	LDX	# >40
	JSR	SETVBV
	LDA	#1	;SET FLAG FOR
	STA	CDTMF5	;TIMER #5
	RTS
;
;GAME START SETUP
;----------------
;
START	JSR	STIMER
	LDA	PLAYERS	;SET PLYRS
	AND	#$0F
	STA	PLYRS
	LDA	ZOMBIES
	AND	#$0F
	STA	ZMBYS	;AND ZMBYS
	CLC
	ADC	PLYRS
	CMP	#1	;IF TOTAL=1,
	BNE	SETACT
	STA	ZMBYS	;SET ZOMBIES TO 1
	LDA	#2	;AND UP TOTAL
SETACT	STA	ACTIVE	;SET # OF ACTIVE
	DEC	ACTIVE	;PARTICAPANTS
;
	LDX	#0	;ERASE WALKERS
	JSR	ERASMAN
	INX
	JSR	ERASMAN
;
;SETUP GAME SCREEN
;
	LDA	# <[MAZEDAT-$84]
	STA	POINTER
	LDA	# >[MAZEDAT-$84]	;SOURCE
	STA	POINTER+1
	LDA	# <[GAMESCR-$84]
	STA	SCRPTR
	LDA	# >[GAMESCR-$84]	;DEST
	STA	SCRPTR+1
	LDX	#1
	LDY	#$84
STSCRLP	LDA	(POINTER),Y	;GET A BYTE
	STA	(SCRPTR),Y	;SAVE IT ONCE
	INC	SCRPTR	;ADD 1 TO DEST
	BNE	STSCP2
	INC	SCRPTR+1
STSCP2	STA	(SCRPTR),Y	;SAVE TWICE +
	INY		;COPY THE NXT ONE
	BNE	STSCRLP
	INC	POINTER+1
	INC	SCRPTR+1
	DEX
	BPL	STSCRLP
;
;ERASE SCREEN BOTTOM
;
	LDA	# <BOTSCRN
	STA	SCRPTR
	LDA	# >BOTSCRN
	STA	SCRPTR+1
	LDY	#79
	LDA	#0
ERASBOT	STA	(SCRPTR),Y
	DEY
	BPL	ERASBOT
;
;SET SCREEN BOTTOM
;
	LDA	#0	;SET COLOR COUNT
	STA	COUNT
	LDA	# <[BOTSCRN+4]	;INIT SCRN
	STA	SCRPTR
	LDA	# >[BOTSCRN+4]	;PNTR
	STA	SCRPTR+1
	LDA	PLYRS	;GET # OF PLAYERS
	BEQ	STZMTXT	;IF 0(DEMO), SKIP
	STA	HOLDIT	;SAVE IT
	LDA	# <PLRTXT	;SET PTR TO
	STA	POINTER	;"WIZARD" TEXT
	LDA	# >PLRTXT
	STA	POINTER+1
	JSR	SETBOTM	;AND SET 'EM
STZMTXT	LDA	ZMBYS	GET # OF ZOMBIES
	BEQ	PUTMIN	;IF 0, SKIP
	STA	HOLDIT	;ELSE, SAVE IT
	LDA	# <ZOMTXT	;SET PTR TO
	STA	POINTER	;"ZOMBIE" TEXT
	LDA	# >ZOMTXT
	STA	POINTER+1
	JSR	SETBOTM	;AND SET 'EM
;
;INITIALIZE ACTIVE PARTICIPANTS
;
PUTMIN	LDX	ACTIVE	;SET ALL ACTIVE
SETALLP	LDA	#0	;TYPE = PLAYER
	STA	TYPE,X
	STA	SCRPND,X	;0 SCORE TO ADD
	STA	ACTFLAG,X	;ACTION TO NONE
	LDA	#3	;MOVE RATE =3
	STA	MOVRATE,X	;(PLR DEFAULT)
	LDA	#5	;NEXT HIT SCORE=5
	STA	NXTSCR,X
	JSR	FNDSPOT	;SET 'IM ON SCRN
	CPX	PLYRS	;IF THIS IS A
	BCC	STNXPLR	;PLAYER, SKIP
	LDA	#$1B	;SET MOVE RATE
	SBC	ZOMSPD	;BY ZOMBIE SPEED
	STA	MOVRATE,X
	LDA	#1	;TYPE = ZOMBIE
	STA	TYPE,X
STNXPLR	DEX		;DO NEXT
	BPL	SETALLP
;
	LDA	PLYRS	;PLAYERS=0? THIS
	BNE	PUTINVB	;IS A DEMO, SET
	LDA	#3	;PLYRS=3 TO FOOL
	STA	PLYRS	;ZOMBIES
;
PUTINVB	JSR	STGAMVB	;INSTALL GAME VBI
	LDA	# <GAME	;PUT UP GAME SCRN
	STA	DLIST
	LDA	# >GAME
	STA	DLIST+1
	LDA	#$C0	;ENABLE DLI
	STA	NMIEN
;
;MAIN PROGRAM LOOP
;-----------------
;
STRTCN	LDA	CDTMF5	;CHECK CONSOL
	BNE	CHKSCRS	;AFTER 2/3 SEC
	LDA	CONSOL	;IF CONSOL KEY
	CMP	#$07	;NOT PRESSED,
	BEQ	CHKSCRS	;KEEP PLAYING
	JSR	VBIOFF	;TURN OFF VBI
EXITLP	LDA	CONSOL	;WAIT FOR CONSOL
	CMP	#$07	;KEY AND STRIG 0
	BNE	EXITLP	;TO BE RELEASED
	LDA	STRIG0
	BEQ	EXITLP
	JMP	RESTART	;AND GOTO TITLES
;
CHKSCRS	LDX	ACTIVE	;GET # TO DO
UDSCORS	LDA	SCRPND,X	;GET # TO ADD
	BEQ	DONXSCR	;IF =0, DO NEXT
	LDY	SCRINDX,X	;GET BASE INDEX
	CLC		;TO SCORE AND ADD
	ADC	SCORE,Y	;TO SCORE
	STA	SCORE,Y
	LDA	#0	;CLR SCORE TO ADD
	STA	SCRPND,X
	LDA	#1	;DIGIT # FOR END
	STA	DIGITNO	;GAME DETECTION
ADDSCR	LDA	SCORE,Y	;DONE?
	BEQ	DONXSCR	;YES, DO NEXT
	CMP	#$DA	;THIS DIGIT >10?
	BCC	SCUNDX	;NO, GO TO RIGHT
	SBC	#10	;YES, SUBTRACT 10
	STA	SCORE,Y	;FROM THIS DIGIT
	DEY		;POINT TO NEXT
	DEC	DIGITNO
	BMI	GAMEOVR	;OVER 100! END IT
	LDA	SCORE,Y	;GET NEW DIGIT
	BNE	SCDGTNZ	;IF BLANK,
	LDA	#$D0	;SET TO ZERO
SCDGTNZ	CLC		;ADD 1 TO IT
	ADC	#1
	STA	SCORE,Y	;SAVE IT
	BNE	ADDSCR	;AND LOOP
SCUNDX	INY		;GO RIGHT 1 DIGIT
	INC	DIGITNO
	BNE	ADDSCR	;CHECK NEXT ONE
DONXSCR	DEX		;TRY ADD TO
	BPL	UDSCORS	;NEXT SCORE
;
;CHECK FOR AND PAUSE GAME
;
	LDA	KEYIN	;CHECK KBD
	CMP	#255	;ANY PRESSED?
	BNE	PAUSE	;GO TO TOP OF
	JMP	STRTCN	;MAIN LOOP
PAUSE	JSR	VBIOFF	;TURN OFF VBI
	LDA	#255	;CLEAR KBD INPUT
	STA	KEYIN
	LDA	#0	;TURN OFF SOUND
	STA	AUDC1
	STA	AUDC2
	STA	AUDC3
	STA	AUDC4
HLDPTRN	LDA	KEYIN	;AND WAIT FOR
	CMP	#255	;A KEY TO BE
	BEQ	HLDPTRN	;PRESSED
	JSR	STGAMVB	;RE-SET GAME VBI
	LDA	#255	;CLEAR KBD INPUT
	STA	KEYIN
	JMP	STRTCN	;GOTO TOP OF LOOP
;
;GAME END HANDLING ROUTINES
;--------------------------
;
GAMEOVR	STX	SAVEIT
	JSR	VBIOFF	;TURN OFF VBI
	LDA	#0	;AND ALL SOUND
	STA	AUDC1
	STA	AUDC2
	STA	AUDC3
	STA	AUDC4
;
;SET WINNER MESSAGE
;
	LDX	SAVEIT
	LDY	#3	;INDEX - TEXT SET
	LDA	SCRINDX,X	;SET POINTER TO
	CLC		;WINNER'S SCORE
	ADC	# <SCORE-1
	STA	SCRPTR
	LDA	# >SCORE-1
	STA	SCRPTR+1
	BCC	STENDTX
	INC	SCRPTR+1
STENDTX	LDA	ENDTXT,Y	;AND SET IT
	STA	(SCRPTR),Y	;TO "WINS"
	DEY
	BPL	STENDTX
;
;EVAPORATE ALL LOSERS
;
	LDA	#0	;CLEAR
	STA	ACTFLAG,X	;WINNER ACTION
	STX	SAVEIT	;SAVE WINNER #
	LDX	ACTIVE	;GET # TO DO
STALLEV	CPX	SAVEIT	;IF =WINNER,
	BEQ	STNXTEV	;DO NEXT ONE
	JSR	ERASMAN	;ELSE ERASE 'IM
	LDA	#2	;ACTION=EVAPORATE
	STA	ACTFLAG,X
	LDA	#9	;MOVEST FOR EVAP
	STA	MOVEST,X
STNXTEV	DEX		;DO THE NEXT ONE
	BPL	STALLEV
;
DOALLEV	LDA	RTCLOK
DOAL2	CMP	RTCLOK
	BEQ	DOAL2
	LDA	#0	;INIT END COUNT=0
	STA	COUNT
	LDX	ACTIVE	;LOOP FOR ALL
EVAPEM	LDA	COUNT	;ADD THIS ACTFLAG
	CLC		;TO COUNT
	ADC	ACTFLAG,X	;(FOR END CHK)
	STA	COUNT
	JSR	EVAPRTE	;AND DO EVAP
	DEX
	BPL	EVAPEM	;DO NEXT
	LDA	COUNT	;IF COUNT=ACTIVE,
	CMP	ACTIVE	;WE'RE DONE,
	BNE	DOALLEV	;OTHERWISE LOOP
;
;SET WINNER AS ALL PM
;
	LDX	SAVEIT	;GET WINNER #
	JSR	ERASMAN	;ERASE 'IM + SET
	LDA	PCOLR0,X	;1ST PM COLOR
	STA	PCOLR0	;TO WINNING COLOR
	LDA	#PFCOL0	;AND OTHERS TO
	STA	PCOLR1	;NORMAL PF COLORS
	LDA	#PFCOL1
	STA	PCOLR2
	LDA	#PFCOL3
	STA	PCOLR3
	LDA	# <WINPLYR	;SET POINTER
	STA	POINTER	;TO ALL PM IMAGES
	LDA	# >WINPLYR
	STA	POINTER+1
	LDA	LOCY,X	;SET SCRPTR
	ASL	A	;TO LOC
	ASL	A
	ASL	A
	CLC
	ADC	#$20
	STA	SCRPTR
	LDA	# >PL0
	STA	SCRPTR+1
	LDA	#3	;COUNT THRU
	STA	COUNT	;ALL 3 PLYRS
SETWINR	LDY	#7	;SET ONE COLOR
SETPRTS	LDA	(POINTER),Y
	STA	(SCRPTR),Y
	DEY
	BPL	SETPRTS
	LDA	LOCX,X	;SET HORIZ LOC
	ASL	A	;TO XLOC*8+48
	ASL	A
	ASL	A
	CLC
	ADC	#48
	LDY	COUNT
	STA	HPOSP0,Y
	LDA	POINTER	;POINT TO NEXT
	CLC		;COLOR'S IMAGES
	ADC	#8
	STA	POINTER
	BCC	UDWNSCP
	INC	POINTER+1
UDWNSCP	INC	SCRPTR+1	;POINT TO NEXT
	DEC	COUNT	;PLAYER
	BPL	SETWINR	;AND DO IT
;
;FADE ALL COLORS TO BLACK
;
	LDA	#16	;SET COLOR LUM
	STA	COUNT	;LEVELS TO 16
FADEALL	LDX	#3	;FADE COLRS=0..3
FADACOL	LDA	COLOR0,X	;GET THE COLOR
	AND	#$0F	;IF LUM <>0, CUT
	BNE	CUTCOLR	;IT DOWN
	STA	COLOR0,X	;SET TO BLACK
	BEQ	FADNXCL
CUTCOLR	DEC	COLOR0,X
FADNXCL	LDY	RTCLOK	;WAIT FOR A BIT
	INY
	INY
FADN2	CPY	RTCLOK
	BNE	FADN2
	DEX
	BPL	FADACOL	;FADE NEXT COLOR
	DEC	COUNT
	BPL	FADEALL	;AND DO NEXT LUM
;
;WAIT A BIT TO SHOW OFF SCORES
;
	LDA	#7
	STA	HOLDIT
WAIT0	LDX	#$FF
WAIT1	LDY	#$FF
WAIT2	LDA	CONSOL	;END DELAY EARLY
	CMP	#7	;IF A CONSOL KEY
	BNE	ENDGOBK	;HAS BEEN PRESSED
	DEY
	BNE	WAIT2
	DEX
	BNE	WAIT1
	DEC	HOLDIT
	BPL	WAIT0
ENDGOBK	JMP	RESTART	;GOTO TITLES
;
;MAIN PROGRAM SUBROUTINES
;------------------------
;
;SET SCREEN BOTTOM LINES (1 TYPE ONLY)
SETBOTM	LDA	#0	;SET TYPE'S LINE
	STA	CURLINE	;COUNT TO 0
SETLNLP	INC	CURLINE	;ADD 1 TO LINE
	LDX	#6	;GET LENGTH INDEX
	LDY	COUNT	;GET COLOR INDEX
SETALIN	LDA	(POINTER),Y	;SET TYPE
	STA	(SCRPTR),Y	;TEXT LINE
	INY
	DEX
	BNE	SETALIN
	INY		;SET TYPE NUMBER
	LDA	CURLINE
	ORA	#$D0
	STA	(SCRPTR),Y
	INY		;INIT SCORE FOR
	INY		;'IM TO ZERO
	INY
	INY
	LDA	#$D0
	STA	(SCRPTR),Y
	LDA	COUNT	;ADD 6
	CLC		;TO COLOR INDEX
	ADC	#6
	STA	COUNT
	LDA	SCRPTR	;POINT TO NEXT
	CLC		;LINE
	ADC	#14
	STA	SCRPTR
	BCC	CHKDONL
	INC	SCRPTR+1
CHKDONL	LDA	CURLINE	;IF WE'VE GOT
	CMP	HOLDIT	;MORE LINES TO
	BNE	SETLNLP	;DO?  DO 'EM
	RTS		;RETURN
;
;INSTALL GAME VBI
;
STGAMVB	LDY	# <VBI
	LDX	# >VBI
	BNE	VBI1
;
;TURN OFF VBI
;
VBIOFF	LDY	# <XITVBV
	LDX	# >XITVBV
VBI1	LDA	#7
	JMP	SETVBV
;
;****************************
;** VERTICAL BLANK ROUTINE **
;****************************
;(All of the game but scoring)
;
;MOVE OUTER WALL
;---------------
;
VBI	LDA	RTCLOK	;TIME TO MOVE?
	AND	#$07
	BNE	MOVGUYS	;NO, MOVE PLAYERS
	LDX	OUTWALL	;SAVE FIRST BYTE
	LDY	#1	;OF WALL AND LOOP
MOVWALL	LDA	OUTWALL,Y	;CHANGING REST
	ASL	A	;GET BYTE + SHIFT
	ROL	A	;IT LEFT 1 PIXEL
	STA	HOLDIT
	AND	#$01
	ADC	HOLDIT
	DEY		;AND MOVE IT UP
	STA	OUTWALL,Y	;1 LINE
	INY
	INY
	CPY	#8
	BNE	MOVWALL	;LOOP FOR NEXT
	TXA		;GET BACK FIRST
	ASL	A	;SHIFT OVER FIRST
	ROL	A
	STA	HOLDIT
	AND	#$01
	ADC	HOLDIT
	STA	OUTWALL+7	;SAVE AT END
;
;MOVE PLAYERS/ZOMBIES
;--------------------
;(Includes shot initialization)
;
MOVGUYS	LDX	ACTIVE	;INIT LOOP COUNT
CKMVLP	LDA	ACTFLAG,X	;IF HE IS
	AND	#$03	;EVAPORATING OR
	BEQ	CHKTIME	;COALESCING, SKIP
	JMP	CHKSHOT	;MOVE + DO SHOTS
;
;CHECK TIME TO MOVE
;
CHKTIME	DEC	MOVCLOK,X	;TIME TO MOVE?
	BEQ	SETIME	;YES, RESET TIME
	LDA	ACTFLAG,X	;IF NO SOUND
	BNE	CKTIMND	;MAKING THING IS
	TXA		;GOING ON, TURN
	ASL	A	;OFF THE SOUND
	TAY		;(THIS FOR BETTER
	LDA	#0	;SOUNDING WALK)
	STA	AUDC1,Y
CKTIMND	JMP	CHKSHOT	;AND DO SHOTS
;
;RESET MOVE TIMER AND PARSE
;TO MOVE ROUTINES
;
SETIME	LDA	MOVRATE,X	;RESET MOVE
	STA	MOVCLOK,X	;TIMER
	LDA	MOVEST,X	;NOT MOVING? TRY
	BEQ	STRTMOV	;MOVING SOMETHING
	JSR	MOVEIM	;ELSE, UPDATE
	JMP	CHKSHOT	;AND DO SHOTS
;
STRTMOV	LDA	TYPE,X	;IF ZOMBIE THEN
	BEQ	PLRMVE	;JUMP TO THEIR
	JMP	ZOMOVE	;MOVE ROUTINES
;
;READ STICK AND SET DIRECTION IF
;IT HAS BEEN MOVED. ALSO, DO ZIGZAG
;
PLRMVE	LDA	STICK0,X	;READ THE STICK
	EOR	#$0F	;IF IT IS MOVED,
	BNE	TRYDIR	;DO IT
	JMP	CHKSHOT	;ELSE, DO SHOTS
;
TRYDIR	TAY		;CONVERTED DIR
	LDA	CONVERT,Y
	CMP	#4	;IS IT DIAGONAL?
	BNE	SETDIR	;NO, SET IT
	STY	HOLDIT	;SAVE IT
	TYA		;GET LAST DIR
	LDY	DIR,X	;FOR ZIGZAG MASK
	AND	XYMASK,Y	;TRY IT ON NEW
	TAY		;CONVERT TO NORM
	LDA	CONVERT,Y
	STA	DIR,X	;SAVE IT + CHECK
	JSR	GETAHEDM	;IF THERE'S ROOM
	BEQ	CHKTRIG	;YES, LOOK TRIG
	LDA	HOLDIT	;USE OTHER DIR
	LDY	DIR,X
	AND	XYMASK,Y
	TAY
	LDA	CONVERT,Y	;CONVERT IT
SETDIR	STA	DIR,X	;AND SET IT
;
;READ TRIGGER AND PARSE TO INIT
;SHOT OR MOVE ROUTINES
;
CHKTRIG	LDA	#0	;CLR ATRACT SINCE
	STA	ATRACT	;STICK WAS MOVED
	LDA	STRIG0,X	;TRIG PRESSED?
	BEQ	INITSHOT	;YES, START SHOT
	JSR	GETAHEDM	;LOOK FOR ROOM
	BEQ	INITMOVE	;FOUND, DO MOVE
	JSR	SETSTIL	;NONE. POINT 'IM
	JMP	CHKSHOT	;AND DO SHOTS
;
;BEGIN A MOVE CYCLE
;
INITMOVE	JSR	INITMVE	;DO LOC ADDS AND
	LDY	NXTSCR,X	;START IT OFF.
	INY		;ADD 1 TO NEXT
	CPY	#23	;NEXT KILL VALUE
	BCC	STNXSC
	LDY	#22
STNXSC	TYA
	STA	NXTSCR,X
	JMP	CHKSHOT	;DO SHOTS
;
;FIRE OFF A SHOT IF WE CAN
;
INITSHOT	LDA	ACTFLAG,X	;ARE WE BEING
	AND	#$F0	;PREVENTED FROM
	BNE	CHKSHOT	;FIRING? YES.
	JSR	SETSTIL	;SET PLYRS DIR
	LDY	NXTSCR,X	;SUBTRACT 2 FROM
	DEY		;NEXT KILL VALUE
	DEY
	CPY	#5
	BCS	STNSCDN
	LDY	#5
STNSCDN	TYA
	STA	NXTSCR,X
	LDA	DIR,X	;SET SHOT DIR
	STA	SHOTDIR,X
	JSR	GETAHEDM	;ANYTHING THERE?
	BNE	FSKILL	;YES, KILL IT
	LDA	SCRPTR	;SET SHOT'S
	STA	SHOTLO,X	;LOCATION
	LDA	SCRPTR+1
	STA	SHOTHI,X
	LDA	ACTFLAG,X	;SET ACTION
	ORA	#$80	;SHOOT FLAG ON
	STA	ACTFLAG,X
	LDA	#0	;INIT SHOT
	STA	SHOTMST,X	;MOVE STATUS
	LDA	#$0C	;BEGIN SOUND
	STA	SOUND,X
	LDY	SHOTDIR,X	;SET SHOT
	LDA	SHSTOFS,Y	;ON SCREEN
	CLC
	ADC	# <SHOTSHP
	STA	POINTER
	LDA	# >SHOTSHP
	JSR	SHRTSET	;EXIT TO SPECIAL
	JMP	COLESCE	;EFFECTS ROUTINES
;
;SHOT IMMEDIATE HIT
;
FSKILL	CMP	#$86	;DID IT HIT
	BCS	FSKNRM	;ANOTHER SHOT?
	LDA	SCRPTR	;YES, START OFF
	STA	SHOTLO,X	;A BACKLASH AND
	LDA	SCRPTR+1	;JUMP TO SPFX
	STA	SHOTHI,X	;ROUTINES
	JSR	STBKLSH
	JMP	COLESCE
FSKNRM	LDA	LOCLO,X	;NO, SET SHOT LOC
	STA	SHOTLO,X	;AND JUMP TO HIT
	STA	SCRPTR	;CHECK ROUTINES
	LDA	LOCHI,X
	STA	SHOTHI,X
	STA	SCRPTR+1
	JMP	CHKWALL
;
;MOVE SHOTS
;----------
;
CHKSHOT	LDA	ACTFLAG,X	;IS THERE ONE
	BMI	CHKHITS	;OUT THERE?
	JMP	COLESCE	;NO. DO SPFX
CHKHITS	LDA	SHOTMST,X	;IF MOVE STAT=0
	BNE	MOVSHOT	;THEN LOOK AHEAD
	JSR	GETAHEDS	;ANYTHING THERE?
	BNE	SHOTHIT	;GOTO SHOT HITS
MOVSHOT	DEC	SHOTMST,X	;UPDATE SHOT
	LDA	SHOTMST,X	;MOVE STATUS
	AND	#$01
	STA	SHOTMST,X	;<>0?
	BEQ	SETSHOT	;YES, WE CROSSED
	LDY	SHOTDIR,X	;A LOCATION, SO
	LDA	SHOTLO,X	;UPDATE IT.
	CLC
	ADC	PRVADLO,Y
	STA	SHOTLO,X
	LDA	SHOTHI,X
	ADC	PRVADHI,Y
	STA	SHOTHI,X
SETSHOT	LDA	SHOTLO,X	;SET POINTERS
	STA	SCRPTR	;TO SHOT ON SCRN
	LDA	SHOTHI,X	;AND SHOT IMAGES
	STA	SCRPTR+1
	LDA	SHOTMST,X
	ASL	A
	ASL	A
	ADC	SHOTDIR,X
	ASL	A
	ASL	A
	ADC	# <SHOTSHP
	STA	POINTER
	LDA	# >SHOTSHP
	ADC	#0
	STA	POINTER+1
	LDA	SHOTDIR,X	;SET THE NEW
	JSR	SETMOVE	;IMAGE
	LDA	SHOTMST,X	;IF SHOT MOVE
	BNE	SHOTSND	;STATUS=0, THEN
	LDY	SHOTDIR,X	;UPDATE LOC
	LDA	SHOTLO,X	;(PART 2)
	CLC
	ADC	AFTRADD,Y
	STA	SHOTLO,X
	BCC	SHOTSND
	INC	SHOTHI,X
SHOTSND	INC	SOUND,X	;UPDATE SOUND
	TXA
	ASL	A
	TAY
	LDA	SOUND,X
	STA	AUDF1,Y
	LDA	#$C6
	STA	AUDC1,Y
	JMP	COLESCE	;EXIT TO SPFX
;
;SHOT HIT CHECKS/HANDLING
;------------------------
;
SHOTHIT	LDA	ACTFLAG,X	;CLEAR SHOOTING
	AND	#$7F	;FLAG.
	STA	ACTFLAG,X
	JSR	ERASHOT	;ERASE SHOT
;
;CHECK HIT ON WALL
;
CHKWALL	LDY	SHOTDIR,X	;GET CHR WE
	JSR	GETAHEDS	;RAN INTO
	CMP	#$FD	;IF NOT WALL,
	BCC	CHKHSHT	;TRY SHOT
	LDY	#$00	;CHANGE WALL'S
	LDA	(SCRPTR),Y	;BRICK COLOR
	AND	#$7F
	STA	(SCRPTR),Y
	INY
	LDA	(SCRPTR),Y
	AND	#$7F
	STA	(SCRPTR),Y
	LDA	ACTFLAG,X	;SET
	ORA	#$20	;EXPLODE FLAG
	STA	ACTFLAG,X
	LDA	#$36
	STA	SOUND,X	;INIT FOR SOUND
	LDA	SCRPTR	;SAVE WALL'S LOC
	STA	SHOTLO,X	;FOR EXPLOSION
	LDA	SCRPTR+1
	STA	SHOTHI,X
	JMP	COLESCE	;EXIT TO SPFX
;
;CHECK HIT ON ANOTHER SHOT
;
CHKHSHT	CMP	#$86	;DID IT HIT SHOT?
	BCC	STSHBKL	;IF NO, CHECK
	BCS	CHKHMAN	;AGAINST A MAN
STSHBKL	JSR	STBKLSH	;SET FOR BACKLASH
	STX	HOLDIT	;SAVE LOOP CNTR
	LDX	ACTIVE	;FIND WHO WE HIT
CHKSHLP	LDA	ACTFLAG,X	;IF NO SHOT
	BPL	CHKNSHT	;FIRED, TRY NEXT
	LDA	SHOTLO,X	;SEE IF THEY
	STA	POINTER	;ARE IN THE SAME
	LDA	SHOTHI,X	;POSITION
	STA	POINTER+1	;(TRY UP/LEFT)
	LDA	SHOTMST,X
	BEQ	CKSHT2
	JSR	SCPCMP
	BEQ	FNDSHOT	;SAME! KILL IT
	LDY	SHOTDIR,X	;(TRY DN/RT)
	JSR	SETPTR
CKSHT2	JSR	SCPCMP
	BNE	CHKNSHT	;TRY NEXT
FNDSHOT	JSR	ERASHOT	;SAME, ERASE IT
	JSR	STBKLSH	;SET FOR BACKLASH
CHKNSHT	DEX		;TRY NEXT ONE
	BPL	CHKSHLP
	LDX	HOLDIT	;RESTORE CNTR
	JMP	COLESCE	;EXIT TO SPFX
;
;CHECK SHOT HIT PLAYER/ZOMBIE
;
CHKHMAN	CMP	#$C0	;IF CHR HIT IS IT
	BCC	COLESCE	;IN RANGE, CHECK
	CMP	#$E0	;FOR A HIT.
	BCS	COLESCE	;(SUBR BELOW)
	JSR	MNHTCHK
;
;SPECIAL EFFECTS
;---------------
;
;PLAYER/ZOMBIE RE-INTEGRATION
;
COLESCE	LDA	RTCLOK	;TIME TO DO IT
	AND	#$01	;YET? NO, THEN DO
	BEQ	CHKCOLS	;NEXT PLAYER/
	JMP	DONXTMN	;ZOMBIE
CHKCOLS	LDA	ACTFLAG,X	;IF HE ISN'T
	AND	#$01	;COALESCING, TRY
	BNE	SETFUZZ	;FOR EVAPORATION
	JMP	TRYEVAP
SETFUZZ	TXA		;SET PNTRS TO
	ASL	A	;EACH OF THE
	ASL	A	;COALESCING CHARS
	ASL	A
	ADC	# <PL0CHR
	STA	POINTER
	ADC	#32
	STA	POINTR0
	LDA	# >PL0CHR
	STA	POINTER+1
	STA	POINTR0+1
	LDA	MOVCLOK,X	;GET FUZZ TOP
	STA	HOLDIT	;AND SET A CNTR
	LDY	#8
DOFUZZ	DEY		;FUZZ UP TO IT
	LDA	RANDOM	;MASKED INTO THE
	AND	MASKL,Y	;CORRECT SHAPE
	STA	(POINTER),Y
	LDA	RANDOM
	AND	MASKR,Y
	STA	(POINTR0),Y
	CPY	HOLDIT
	BNE	DOFUZZ
	LDA	MOVEST,X	;NOT YET TIME
	AND	#$08	;FOR THE NORMAL
	BNE	UDCPTRS	;PART, SKIP TO
	;		UPDATE COUNTERS
	LDA	MOVEST,X	;GET NORM TOP
	STA	HOLDIT	;AND SET A CNTR
	LDY	#8
SETNORM	DEY		;SET THE NORMAL
	LDA	STLCHR,Y	;IMAGE TO THAT
	STA	(POINTER),Y	;POINT IN
	LDA	STRCHR,Y	;CHAR
	STA	(POINTR0),Y
	CPY	HOLDIT
	BNE	SETNORM
	LDA	LOCY,X
	ASL	A
	ASL	A
	ASL	A
	ADC	#$20
	STA	SCRPTR
	TXA
	CLC
	ADC	# >PL0
	STA	SCRPTR+1
	LDY	#8
SETCOAT	DEY		;AND IN
	LDA	SUITS,Y	;PM OVERCOAT
	STA	(SCRPTR),Y
	CPY	HOLDIT
	BNE	SETCOAT
UDCPTRS	LDA	MOVCLOK,X	;IF PART 1
	BEQ	CLSCSND	;COUNTR<>0, SUB
	DEC	MOVCLOK,X	;1 FROM IT
CLSCSND	TXA		;SET SOUND. (IN
	ASL	A	;TWO ALTERNATING,
	TAY		;INDEPENDENT
	LDA	MOVEST,X	;RANGES OF
	AND	#$01	;FREQUENCY...
	BEQ	CLSTYP2
	LDA	MOVEST,X
	ASL	A
	ASL	A
	ASL	A
	ORA	#$80
	BNE	CLSVOLM
CLSTYP2	LDA	MOVEST,X
	ASL	A
	ADC	#6
CLSVOLM	CLC
	STA	AUDF1,Y	;...AND TONE)
	LDA	MOVEST,X
	BPL	CLS01
	SEC
CLS01	ROR	A
	EOR	#$27
	ADC	#1
	STA	AUDC1,Y
	DEC	MOVEST,X	;COUNTDOWN CNTR2
	BNE	BCKLASH	;<>0? EXIT.
	JSR	SETSTIL	;COLS OVER, SET
	TXA		;NORMAL AND
	ASL	A	;TURN OFF SOUND
	TAY
	LDA	#0
	STA	AUDC1,Y
	LDA	ACTFLAG,X	;CLR COALESCE
	AND	#$FE	;FLAG
	STA	ACTFLAG,X
	LDA	MOVRATE,X	;RESET
	STA	MOVCLOK,X	;MOVE TIMER
	BNE	BCKLASH	;GOTO SPFX PART 2
;
;ZOMBIE/PLAYER EVAPORATION
;
TRYEVAP	JSR	EVAPRTE
;
;SHOT BACKLASH + WALL EXPLOSION PART 2
;
BCKLASH	LDA	ACTFLAG,X	;IF IT ISN'T
	AND	#$10	;BACKLASHING,
	BNE	DOBKLSH	;EXIT TO CHK FOR
	JMP	WLXPLOD	;WALL EXPLODING
DOBKLSH	LDA	SHOTMST,X	;IF BCKLASH
	BPL	BKLSND	;OVER, ERASE IT
	JMP	ERBKLSH	;AND LEAVE
BKLSND	TXA		;SET BACKLASH
	ASL	A	;SOUND
	TAY
	LDA	SHOTMST,X
	EOR	#$03
	ASL	A
	ASL	A
	ASL	A
	ASL	A
	ADC	#16
	STA	AUDF1,Y
	LDA	SHOTMST,X
;
	ASL	A
	ASL	A
	ADC	#2
	STA	AUDC1,Y
	LDA	#3	;INIT DIRECT
	STA	DIREC	;LOOP CNTR
	LDA	SHOTDIR,X	;AND DIR FLAGS
	STA	DIRSHFT
STBKSLP	LSR	DIRSHFT	;BACKLASH IN THIS
	BCC	STBKNDR	;DIR?  NO.
	JSR	ADBLOFS	;ADD DIR OFFSET +
	JSR	GETHERE	;LOOK FOR <>EMPTY
	BEQ	STNRGBL	;IF EMPTY, SET IT
	CMP	#$9B	;ELSE, AS LONG AS
	BCC	NRGBLHT	;IT IS A BCKLASH
	CMP	#$9E	;CHR, SET IT.
	BCC	STNRGBL
NRGBLHT	LDY	DIREC	;OTHERWISE, CLR
	LDA	DIRBIT,Y	;THIS DIR BIT
	EOR	#$0F
	AND	SHOTDIR,X
	STA	SHOTDIR,X
	JSR	MNHTCHK	;CHECK FOR HIT
	LDY	DIREC	;A GUY. ERASE THE
	LDA	SCRPTR	;BACKLASH IMAGE
	SEC
	SBC	DIRADLO,Y
	STA	SCRPTR
	LDA	SCRPTR+1
	SBC	DIRADHI,Y
	STA	SCRPTR+1
	LDA	#0
	LDY	#1
ERBLHT	STA	(SCRPTR),Y
	DEY
	BPL	ERBLHT
	BNE	STBKNDR	;AND DO NEXT DIR
STNRGBL	LDA	SHOTMST,X	;SET THE
	AND	#$01	;BACKLASH CHARS
	ASL	A
	ASL	A
	ORA	DIREC
	ASL	A
	ADC	# <EXPLSHP
	STA	POINTER
	LDA	# >EXPLSHP
	ADC	#0
	STA	POINTER+1
	LDY	#1
STBKLP	LDA	(POINTER),Y
	STA	(SCRPTR),Y
	DEY
	BPL	STBKLP
STBKNDR	DEC	DIREC	;DO NEXT DIR
	BPL	STBKSLP
ERBKLSH	INC	SHOTMST,X
	LDA	SHOTMST,X	;TIME TO ERASE?
	AND	#$05
	BNE	UDBKLST	;NO. UPDATE STAT
	LDA	#3	;SET LOOP COUNTER
	STA	DIREC
	LDA	SHOTDIR,X	;AND DIR FLAGS
	STA	DIRSHFT
ERBKSLP	LSR	DIRSHFT	;GOING THIS WAY?
	BCC	ERBKNDR	;NO, DO NEXT
	JSR	ADBLOFS	;YES, ADD OFFSET
	LDA	#0	;AND ERASE IT
	TAY
	STA	(SCRPTR),Y
	INY
	STA	(SCRPTR),Y
ERBKNDR	DEC	DIREC	;DO NEXT DIR
	BPL	ERBKSLP
UDBKLST	DEC	SHOTMST,X	;UPDATE STATUS
	DEC	SHOTMST,X
	LDA	SHOTMST,X
	CMP	#-2	;IF AT END, OR
	BEQ	NRGBLND
	LDA	SHOTDIR,X	;NO DIRS LEFT
	BNE	BKLEXIT
NRGBLND	TXA		;TURN OFF SOUND,
	ASL	A
	TAY
	LDA	#$00
	STA	AUDC1,Y
	LDA	ACTFLAG,X	;AND CLR ACTION
	AND	#$0F	;BACKLASH FLAG
	STA	ACTFLAG,X
BKLEXIT	JMP	DONXTMN	;EITHER WAY, EXIT
;
;WALL EXPLOSION PART 1. BUILD UP
;
WLXPLOD	LDA	ACTFLAG,X	;IF WALL IS NOT
	AND	#$20	;EXPLODING, DO
	BEQ	DONXTMN	;NEXT PLAYER/
	TXA		;ZOMBIE, GET
	ASL	A	;SOUND INDEX
	TAY
	INC	SOUND,X
	LDA	SOUND,X
	STA	COLOR2	;AND UPDATE COLOR
	AND	#$0F
	BEQ	STFBLEX	;IF NOT AT END,
	ASL	A	;SET SOUND
	ASL	A
	EOR	#$3C
	ADC	#$20
	STA	AUDF1,Y
	LDA	SOUND,X
	AND	#$0F
	LSR	A
	CLC
	ADC	#$20
	STA	AUDC1,Y
	BNE	DONXTMN	;AND EXIT
STFBLEX	LDA	#0	;TURN OFF SOUND
	STA	AUDC1,Y
	TAY
	LDA	SHOTLO,X	;ERASE THE WALL
	STA	SCRPTR
	LDA	SHOTHI,X
	STA	SCRPTR+1
	TYA
	STA	(SCRPTR),Y
	INY
	STA	(SCRPTR),Y
	JSR	STBKLSH	;INIT BACKLASH
	LDA	SHOTDIR,X	;(ALL DIRS BUT
	EOR	#$0F	;FROM SHOT)
	STA	SHOTDIR,X
;
;DO NEXT PLAYER/ZOMBIE
;
DONXTMN	DEX
	BMI	EXIT
	JMP	CKMVLP
EXIT	JMP	XITVBV
;
;
;ZOMBIE MOVEMENT HANDLING
;------------------------
;
ZOMOVE	STX	HOLDIT	;SAVE IDENTITY
;
;SHOOT AT ANYONE IN A STRAIGHT LINE
;AWAY FROM THE ZOMBIE
;
	LDY	PLYRS
	LDA	LOCY,X
ZCKYSHL	DEY		;IS THERE ANYBODY
	BMI	ZSHDOY	;IN A STRAIGHT
	CPY	HOLDIT	;LINE FROM THE
	BEQ	ZCKYSHL	;ZOMBIE IS THE X
	CMP	LOCY,Y	;DIRECTION?
	BNE	ZCKYSHL
	LDA	LOCX,X	;SHOOT AT HIM
	CMP	LOCX,Y
	LDA	#0
	BCC	ZMSHOOT
	LDA	#2
	BNE	ZMSHOOT
;
ZSHDOY	LDY	PLYRS	;OTHERWISE, WE'LL
	LDA	LOCX,X	;TRY UP AND DOWN.
ZCKXSHL	DEY		;IS THERE ANYBODY
	BMI	ZMTRYMV	;IN A STRAIGHT
	CPY	HOLDIT	;LINE AWAY IN
	BEQ	ZCKXSHL	;THE Y DIRECTION?
	CMP	LOCX,Y
	BNE	ZCKXSHL	;IF NO, THEN TRY
	LDA	LOCY,X	;MOVING
	CMP	LOCY,Y
	LDA	#1
	BCC	ZMSHOOT
	LDA	#3
;
ZMSHOOT	STA	DIR,X	;ELSE, SET UP
	LDA	LOCLO,X	;AND SHOOT
	STA	SCRPTR
	LDA	LOCHI,X
	STA	SCRPTR+1
	JMP	INITSHOT
;
;FIND NEAREST PLAYER
;
ZMTRYMV	LDA	#255	;SET DIST TO MAX
	STA	DIST
	LDY	PLYRS
ZMCKNXM	DEY
	BMI	ZMFDIR
	CPY	HOLDIT	;IF ON SELF, SKIP
	BEQ	ZMCKNXM
	JSR	GETDXDY	;GET DISTANCE
	CLC
	ADC	DX
	CMP	DIST	;IF <CURRENT, SET
	BCS	ZMCKNXM	;AS THE NEW LOW
	STA	DIST
	STY	NEAREST
	BCC	ZMCKNXM	;AND DO NEXT
;
;AND MOVE TO HIM, IF POSSIBLE
;CLEAR AWAY A WALL IF NOT.
;
ZMFDIR	LDY	NEAREST	;FIND LONGER DIR
	JSR	GETDXDY
	CMP	DX	;IF Y IS LONG
	BCS	CKYLONG	;DIR, SKIP TO IT.
	JSR	CHKXDIR	;IS AREA BLANK?
	BEQ	ZMMOVE	;IF YES, MOVE
	LDY	NEAREST	;OTHERWISE, CHECK
	JSR	CHKYDIR	;Y (SHORT)
	BEQ	ZMMOVE	;IF BLANK, MOVE
	LDY	NEAREST	;ELSE, SHOOT OUT
	JSR	CHKXDIR	;THE X-WALL
	LDA	DIR,X
	JMP	ZMSHOOT
;
CKYLONG	JSR	CHKYDIR	;IF LONG Y IS
	BEQ	ZMMOVE	;BLANK, THEN MOVE
	LDY	NEAREST	;ELSE, CHECK X
	JSR	CHKXDIR
	BEQ	ZMMOVE	;IF BLANK, MOVE
	LDY	NEAREST	;ELSE SHOOT OUT
	JSR	CHKYDIR	;THE Y-WALL
	LDA	DIR,X
	JMP	ZMSHOOT
ZMMOVE	JMP	INITMOVE
;
;ZOMBIE MOVE SUBROUTINES
;-----------------------
;
;IS THERE AN OPENING IN THE X DIR
;
CHKXDIR	LDA	LOCX,X	;FIRST, SET LEFT
	CMP	LOCX,Y	;OR RIGHT
	LDA	#0
	BCC	STXDIR
	LDA	#2
STXDIR	STA	DIR,X
	JMP	GETAHEDM	;THEN LOOK
;
;IS THERE AN OPENING IN THE Y DIR
;
CHKYDIR	LDA	LOCY,X	;FIRST, SET DIR
	CMP	LOCY,Y	;UP OR DOWN
	LDA	#1
	BCC	STYDIR
	LDA	#3
STYDIR	STA	DIR,X
	JMP	GETAHEDM	;THEN GO LOOK
;
;GET X & Y DISPLACEMENTS
;
GETDXDY	LDA	LOCX,X	;SUBTRACT TARGET
	SEC		;X FROM ZOMBIE X
	SBC	LOCX,Y
	BPL	SAVEDX	;AND TAKE
	EOR	#$FF	;ABSOLUTE VALUE
	CLC
	ADC	#1
SAVEDX	STA	DX	;SAVE IT IN DX
	LDA	LOCY,X	;THEN, SUBTRACT
	SEC		;TARGET Y FROM
	SBC	LOCY,Y	;ZOMBIE Y
	BPL	DXDYEND	;AND TAKE THE
	EOR	#$FF	;ABSOLUTE VALUE
	CLC
	ADC	#1
DXDYEND	RTS
;
;*****************
;** SUBROUTINES **
;*****************
;
;MOVEMENT RELATED
;----------------
;
;BEGIN MOVE
;
INITMVE	LDY	DIR,X	;ADD ON THE
	CLC		;MOVE PRECEDED
	LDA	LOCLO,X	;LOCATION CHANGES
	ADC	PRVADLO,Y	;TO THE ACTUAL
	STA	LOCLO,X	;ADDRESS,
	LDA	LOCHI,X
	ADC	PRVADHI,Y
	STA	LOCHI,X
	LDA	LOCX,X	;THE X-LOCATION,
	CLC
	ADC	PRVXADD,Y
	STA	LOCX,X
	LDA	LOCY,X	;THE Y-LOCATION
	CLC
	ADC	PRVYADD,Y
	STA	LOCY,X
	TYA		;INIT MOVE STATUS
	AND	#$02
	ASL	A
	STA	MOVEST,X
;
;CYCLE PLAYER/ZOMBIE MOVE
;
MOVEIM	LDA	DIR,X	;UPDATE MOVE STAT
	AND	#$02	;(UP FOR RT/DN,
	BNE	MVRGDN	;DOWN FOR LF/UP)
	INC	MOVEST,X
	BNE	SETPLR
MVRGDN	DEC	MOVEST,X
SETPLR	LDA	LOCLO,X	;SET POINTER TO
	STA	SCRPTR	;SCREEN IMAGE
	LDA	LOCHI,X
	STA	SCRPTR+1
	LDA	MOVEST,X	;AND ANOTHER TO
	AND	#$03	;THE SHAPE TABLE
	ASL	A	;SOURCE
	ASL	A
	ADC	DIR,X
	ASL	A
	ASL	A
	ADC	# <SHAPES
	STA	POINTER
	LDA	# >SHAPES
	ADC	#0
	STA	POINTER+1
	LDA	DIR,X
	JSR	SETMOVE	;SET NEW IMAGE
	JSR	SETSUIT	;(CHAR & PM)
	LDA	MOVEST,X	;KEEP STATUS IN
	AND	#$03	;THE 0-3 RANGE
	STA	MOVEST,X
	BNE	MOVSND	;<>0, DO SOUND
	LDY	DIR,X	;THIS MOVE'S OVER
	LDA	LOCLO,X	;SO DO THE POST-
	CLC		;MOVE LOC CHANGES
	ADC	AFTRADD,Y	;FOR ABS MEM
	STA	LOCLO,X	;LOCATIONS
	BCC	UDTLOCS
	INC	LOCHI,X
UDTLOCS	LDA	LOCX,X	;X-LOCATION
	CLC
	ADC	AFTXADD,Y
	STA	LOCX,X
	LDA	LOCY,X	;Y-LOCATION
	CLC
	ADC	AFTYADD,Y
	STA	LOCY,X
MOVSND	LDA	ACTFLAG,X	;IF SOME OTHER
	AND	#$B0	;SOUND IS ON
	BNE	MOVMXIT	;RETURN
	TXA		;SET SHUFFLE
	ASL	A	;NOISE ON AN
	TAY		;EVEN MOVE STATUS
	LDA	MOVEST,X
	AND	#$01
	BEQ	MOVMXIT
	LDA	#$04
	STA	AUDC1,Y
	LDA	#$20
	STA	AUDF1,Y
MOVMXIT	RTS
;
;
;PLACEMENT
;---------
;
;SET THE CHR IMAGE FOR PLAYER OR SHOT
;
SETMOVE	STA	HOLDIT	;SAVE DIRECTION
	LDY	#0	;SET BYTES 1,2
	LDA	(POINTER),Y
	STA	(SCRPTR),Y
	INY
	LDA	(POINTER),Y
	STA	(SCRPTR),Y
	LDA	HOLDIT	;IF DIR IS UP OR
	AND	#$01	;DOWN THEN ADD TO
	BEQ	SETMOV2	;SCRN PNTR TO GO
	LDA	SCRPTR	;DOWN 1 LINE
	CLC
	ADC	#$26
	STA	SCRPTR
	BCC	SETMOV2
	INC	SCRPTR+1
SETMOV2	INY		;SET NEXT 2 BYTES
	LDA	(POINTER),Y
	STA	(SCRPTR),Y
	INY
	LDA	(POINTER),Y
	STA	(SCRPTR),Y
	RTS
;
;SET STATIONARY PLAYER/ZOMBIE
;
SETSTIL	LDA	LOCLO,X	;SET POINTER
	STA	SCRPTR	;TO SCREEN FOR
	LDA	LOCHI,X	;SUBROUTINE
	STA	SCRPTR+1
	LDY	DIR,X	;SET POINTER TO
	LDA	SHSTOFS,Y	;APPROPRIATE
	CLC		;IMAGE IN THE
	ADC	# <SHAPES	;SHAPE TABLE
	STA	POINTER
	LDA	# >SHAPES
	JSR	SHRTSET	;AND SET AWAY...
;
;SET PM PORTION OF PLAYER/ZOMBIE
;
SETSUIT	LDA	MOVEST,X	;FIND WHAT SUIT
	AND	#$03	;IMAGE TO USE AND
	CLC		;POINT TO IT
	ROR	A
	ROR	A
;	ADC	# <SUITS
	ORA	DIR,X
	ROR	A
	ROR	A
	ROR	A
	ROR	A
	STA	POINTER
	LDA	# >SUITS
	STA	POINTER+1
	LDA	LOCY,X	;CALC PM Y START
	ASL	A	;BASE=Y*8+32
	ASL	A
	ASL	A
	CLC
	ADC	#32
	STA	SCRPTR
	LDA	DIR,X	;IF GOING UP/DN,
	AND	#$01	;ADD ON MOVE
	BEQ	FNDDHI	;STATUS *2
	LDA	MOVEST,X
	ASL	A
	CLC
	ADC	SCRPTR
	STA	SCRPTR
FNDDHI	TXA
	CLC
	ADC	# >PL0
	STA	SCRPTR+1
	LDY	#$08	;SET THE IMAGE
READPIC	LDA	(POINTER),Y	;(DATA HAS
	STA	(SCRPTR),Y	;0'S IN IT TO
	DEY		;ERASE OLD IMAGE)
	BPL	READPIC
	LDA	LOCX,X	;SET HORIZ LOC
	ASL	A	;BASE=X*8+48
	ASL	A
	ASL	A
	CLC
	ADC	#48
	STA	SCRPTR
	LDA	DIR,X	;IF GOING LF/RT,
	AND	#$01	;ADD ON MOVE
	BNE	STHORZ	;STATUS*2
	LDA	MOVEST,X
	ASL	A
	CLC
	ADC	SCRPTR
	STA	SCRPTR
STHORZ	LDA	SCRPTR
	STA	HPOSP0,X
	RTS
;
;SET SHOT/PLAYER USING PRESET POINTERS
;
SHRTSET	ADC	#0	;FINISH SETTING
	STA	POINTER+1	;SOURCE PNTR
	LDY	#1
SETLP	LDA	(POINTER),Y	;AND SET IT
	STA	(SCRPTR),Y
	DEY
	BPL	SETLP
	RTS
;
;FIND A RANDOM PLACE TO PUT A
;PLAYER/ZOMBIE ON THE SCREEN AND
;SET FOR COALESCE
;
FNDSPOT	LDA	RANDOM	;GET A RANDOM X
	AND	#$1F	;MASK UPPER BITS
	CMP	#19	;IF NOT IN RANGE,
	BCS	FNDSPOT	;TRY AGAIN
	STA	LOCX,X
	LDA	RANDOM	;GET A RANDOM Y
	AND	#$1F	;MASK UPPER BITS
	CMP	#18	;IF NOT IN RANGE
	BCS	FNDSPOT	;TRY AGAIN
	STA	LOCY,X
	STA	POINTER	;GET Y*40
	LDA	#0
	STA	SCRPTR
	STA	SCRPTR+1
	STA	POINTER+1
	LDA	#$28
	STA	POINTR0
	LDY	#6
MULTPLY	LSR	POINTR0
	BCC	FNDSPT2
	LDA	SCRPTR
	CLC
	ADC	POINTER
	STA	SCRPTR
	LDA	SCRPTR+1
	ADC	POINTER+1
	STA	SCRPTR+1
FNDSPT2	ASL	POINTER
	ROL	POINTER+1
	DEY
	BNE	MULTPLY
	LDA	LOCX,X	;ADD X*2
	ASL	A
	ADC	SCRPTR
	BCC	ADDSCRN
	INC	SCRPTR+1
ADDSCRN	CLC		;ADD SCREEN ADDR
	ADC	# <GAMESCR
	STA	SCRPTR
	LDA	SCRPTR+1
	ADC	# >GAMESCR
	STA	SCRPTR+1
	JSR	GETHERE	;SEE IF IT IS
	BNE	FNDSPOT	;EMPTY? NO, AGAIN
	LDA	SCRPTR	;YES, SET LOC
	STA	LOCLO,X	;TO IT
	LDA	SCRPTR+1
	STA	LOCHI,X
	LDA	#0
	STA	DIR,X	;DIRECTION TO RT
	TXA		;CLR COALESCE
	ASL	A	;CHARS FOR THIS
	ASL	A	;PLAYER
	ASL	A
	ADC	# <PL0CHR
	STA	POINTER
	ADC	#32
	STA	POINTR0
	LDA	# >PL0CHR
	STA	POINTER+1
	STA	POINTR0+1
	LDA	#0
	LDY	#7
CLRCLCH	STA	(POINTER),Y
	STA	(POINTR0),Y
	DEY
	BPL	CLRCLCH
	TXA		;SET SCRN TO THEM
	CLC
	ADC	#8
	LDY	#0
	STA	(SCRPTR),Y
	INY
	ADC	#4
	STA	(SCRPTR),Y
	LDA	LOCX,X	;PLR HORIZ POS
	ASL	A
	ASL	A
	ASL	A
	CLC
	ADC	#48
	STA	HPOSP0,X
	LDA	ACTFLAG,X	;COALESCE FLAG
	AND	#$FD	;TO TRUE
	ORA	#$01
	STA	ACTFLAG,X
	LDA	#$0F	;SET ITS CNTRS
	STA	MOVEST,X
	LDA	#7
	STA	MOVCLOK,X
	RTS
;
;ERASURE
;-------
;
;ERASE A SHOT
;
ERASHOT	LDA	SHOTLO,X	;SET POINTER TO
	STA	POINTR0	;THE SHOT LOC
	LDA	SHOTHI,X
	STA	POINTR0+1
	LDA	#0	;ERASE 2 BYTES
	TAY
	STA	(POINTR0),Y
	INY
	STA	(POINTR0),Y
	LDA	SHOTMST,X	;MOVE STAT=0?
	BEQ	ERSHXIT	;YES. DONE
	LDA	SHOTDIR,X	;ADD A LINE
	AND	#$01	;IF UP/DOWN
	BEQ	ERSHOT2
	LDY	#$27
	LDA	#0
ERSHOT2	INY		;ERASE 2 BYTES
	STA	(POINTR0),Y
	INY
	STA	(POINTR0),Y
ERSHXIT	TXA		;TURN OFF SOUND
	ASL	A
	TAY
	LDA	#0
	STA	AUDC1,Y
	RTS
;
;ERASE PLAYER/ZOMBIE
;
ERASMAN	LDA	LOCLO,X	;SET A POINTER
	STA	POINTR0	;TO THE SCREEN
	LDA	LOCHI,X	;CHR IMAGE
	STA	POINTR0+1
	LDA	#0	;ERASE 2 CHARS
	TAY
	STA	(POINTR0),Y
	INY
	STA	(POINTR0),Y
	LDA	MOVEST,X	;IF MOVEST=0,
	BEQ	ERMNXIT	;CHARS DONE,
	;		ERASE PM
	LDA	DIR,X	;ADD 1 LINE IF
	AND	#$01	;GOING UP/DOWN
	BEQ	ERSMAN2
	LDY	#$27
	LDA	#0
ERSMAN2	INY		;ERASE 2 CHARS
	STA	(POINTR0),Y
	INY
	STA	(POINTR0),Y
ERMNXIT	TXA		;ERASE PLAYER'S
	CLC		;ENTIRE PM
	ADC	# >PL0
	STA	POINTR0+1
	LDA	#0
	STA	POINTR0
	TAY
ERSUTLP	STA	(POINTR0),Y
	DEY
	BNE	ERSUTLP
	RTS
;
;COLLISION DETECTION
;-------------------
;
;LOOK AHEAD SUBS
;
GETAHEDS	LDA	SHOTLO,X	;GET WHAT'S IN
	STA	SCRPTR	;FRONT OF A SHOT.
	LDA	SHOTHI,X	;SET PNTRS, DIR
	STA	SCRPTR+1	;& GOTO GETAHED
	LDY	SHOTDIR,X
	JMP	GETAHED
;
GETAHEDM	LDA	LOCLO,X	;GET WHAT'S IN
	STA	SCRPTR	;FRONT OF PLAYER.
	LDA	LOCHI,X	;SET PNTRS, DIR
	STA	SCRPTR+1
	LDY	DIR,X
;
GETAHED	LDA	SCRPTR	;ADD ON TO PNTR
	CLC		;BY DIR PASSED
	ADC	DIRADLO,Y	;IN Y REG
	STA	SCRPTR
	LDA	SCRPTR+1
	ADC	DIRADHI,Y
	STA	SCRPTR+1
GETHERE	LDY	#0	;FIND WHAT'S TO
	LDA	(SCRPTR),Y	;BY THE SCREEN
	INY		;POINTER
	ORA	(SCRPTR),Y
	RTS
;
;CHECK FOR HITS ON PLAYERS/ZOMBIES
;
MNHTCHK	STX	HOLDIT	;SAVE WHO WE ARE
	LDX	ACTIVE	;LOOP TO CHK ALL
CHKMNLP	LDA	ACTFLAG,X	;IF PLAYER NOT
	AND	#$0F	;ON, DO NEXT
	BNE	CHKNMAN
	LDA	LOCLO,X	;SET POINTER
	STA	POINTER	;TO COMPARE
	LDA	LOCHI,X
	STA	POINTER+1
	LDA	MOVEST,X	;IF NOT MOVING,
	BEQ	CKMAN2	;CHECK IT ONCE
	JSR	SCPCMP	;TRY ONCE,
	BEQ	FNDMAN	;IF FOUND, DO IT!
	LDY	DIR,X	;MOVE TO OTHER
	JSR	SETPTR	;POSSIBILITY
CKMAN2	JSR	SCPCMP	;IS IT THERE?
	BNE	CHKNMAN	;NO, DO NEXT
FNDMAN	JSR	ERASMAN	;ELSE, ERASE 'IM
	LDA	ACTFLAG,X	;SET TO
	ORA	#$02	;EVAPORATE
	STA	ACTFLAG,X
	LDA	#9	;SET EVAP COUNTER
	STA	MOVEST,X
	CPX	HOLDIT	;IF HIT SELF
	BEQ	CHKHMND	;(LIKE IN BACK-
	;		LASH) NO SCORE
	LDX	HOLDIT	;SCORE PENDING
	LDA	SCRPND,X	;TO NEXT SCORE
	CLC
	ADC	NXTSCR,X
	STA	SCRPND,X
	LDA	#5	;RESET NEXT SCORE
	STA	NXTSCR,X	;TO 5
CHKHMND	RTS
;
CHKNMAN	DEX		;CHECK NEXT
	BPL	CHKMNLP
	LDX	HOLDIT	;IF NONE FOUND,
	RTS		;GET BACK SELF ID
;
;SEE IF POINTER=SCRPTR (USED ABOVE
;AND IN SHOT VS SHOT CHECKS)
;
SCPCMP	LDA	SCRPTR	;CHECK LO
	CMP	POINTER
	BNE	SCPGBK	;IF <>, EXIT
	LDA	SCRPTR+1	;ELSE, TRY HIGH
	CMP	POINTER+1
SCPGBK	RTS
;
;CHANGE POINTER TO OTHER POSSIBLE
;LOCATION ON COLLISION (USED ABOVE
;AND IN SHOT VS SHOT CHECKS)
;
SETPTR	LDA	POINTER	;SUB PRIOR TO
	SEC		;MOVE ADD AMOUNT
	SBC	PRVADLO,Y
	STA	POINTER
	LDA	POINTER+1
	SBC	PRVADHI,Y
	STA	POINTER+1
	LDA	POINTER	;ADD AFTER MOVE
	CLC		;ADD AMOUNT
	ADC	AFTRADD,Y	;WEIRD, BUT...
	STA	POINTER
	BCC	STPTRND
	INC	POINTER+1
STPTRND	RTS
;
;SPECIAL EFFECTS
;---------------
;
;EVAPORATION OF PLAYER/ZOMBIE
;
EVAPRTE	LDA	ACTFLAG,X	;SEE IF HE IS
	AND	#$02	;EVAPORATING
	BNE	DOEVAP	;IF NOT, RETURN
	RTS
;
DOEVAP	LDA	LOCY,X	;ELSE, SET PNTR
	ASL	A	;INTO PLAYER X
	ASL	A
	ASL	A
	ADC	#32
	STA	SCRPTR
	TXA
	CLC
	ADC	# >PL0
	STA	SCRPTR+1
	TXA		;SET SOUND INDEX
	ASL	A
	TAY
	DEC	MOVEST,X	;UPDATE COUNTER
	BMI	ENDEVAP	;IF AT END
	LDA	#10	;ELSE, SET SOUND
	STA	AUDF1,Y
	STY	HOLDIT
	LDY	MOVEST,X
	LDA	EXPNVLP,Y
	LDY	HOLDIT
	STA	AUDC1,Y
	LDA	MOVEST,X	;FIND WHAT CLOUD
	AND	#$0E	;STATE TO USE
	ASL	A
	ASL	A
	ADC	# <SMOKE
	STA	POINTER
	LDA	# >SMOKE
	STA	POINTER+1
	LDY	#7	;AND SET IT
READSMK	LDA	(POINTER),Y
	STA	(SCRPTR),Y
	DEY
	BPL	READSMK
	RTS		;AND RETURN
;
ENDEVAP	LDA	#0	;EVAP DONE, TURN
	STA	AUDC1,Y	;OFF SOUND
	LDY	#7	;ERASE CLOUD
CLRSMOK	STA	(SCRPTR),Y
	DEY
	BPL	CLRSMOK
	JMP	FNDSPOT	;FIND SPOT TO
	;		PUT HIM BACK IN
;
;SETUP A SHOT FOR BACKLASH
;
STBKLSH	LDA	ACTFLAG,X	;SET FLAG =TRUE
	AND	#$0F
	ORA	#$10
	STA	ACTFLAG,X
	LDA	SHOTDIR,X	;TURN SHOT DIR
	EOR	#$02	;THE OTHER WAY
	TAY
	LDA	DIRBIT,Y	;SET IN BACKLASH
	STA	SHOTDIR,X	;FASHION
	LDA	#3	;SET SHRAPNEL
	STA	SHOTMST,X	;DISTANCE TO 3
	RTS
;
;SET POINTER OFFSET FROM BACKLASH BASE
;
ADBLOFS	LDA	SHOTMST,X	;FIGURE OUT HOW
	LSR	A	;MANY LOCATIONS
	EOR	#$01	;AWAY IT IS
	CLC
	ADC	#1
	STA	COUNT	;AND SAVE IT
	LDA	SHOTLO,X	;SET BASE
	STA	SCRPTR
	LDA	SHOTHI,X
	STA	SCRPTR+1
	LDY	DIREC	;ADD DIRECTION
ADOFSLP	LDA	SCRPTR	;OFFSET AS MANY
	CLC		;PLACES AWAY AS
	ADC	DIRADLO,Y	;WE HAD TO GO
	STA	SCRPTR
	LDA	SCRPTR+1
	ADC	DIRADHI,Y
	STA	SCRPTR+1
	DEC	COUNT
	BNE	ADOFSLP
	RTS
;
;*****************
;** DLI ROUTINE **
;*****************
;
DLI	PHA
	LDA	#PLR0COL	;SET COLORS FOR
	STA	COLPF0	;BOTTOM OF SCREEN
	LDA	#PLR1COL	;TO THOSE OF
	STA	COLPF1	;PLAYER/ZOMBIE
	LDA	#PLR2COL	;SUIT COLORS
	STA	COLPF2
	LDA	#PLR3COL
	STA	COLPF3
	PLA
	RTI
;
;
;**********************
;** PROGRAM DATABASE **
;**********************
;
;NUMERICAL DATA
;--------------
;
;LOCATION ADDITIONS TO GET NEW
;LOCATIONS (SEPARATED BY DIR)
;
AFTYADD	.BYTE	0	;1,0,0
AFTXADD	.BYTE	1	;0,0,0
PRVYADD	.BYTE	0	;0,0,-1
PRVXADD	.BYTE	0,0,-1	;0
DIRADHI	.BYTE	0,0,-1,-1
DIRADLO	.BYTE	2,40,-2,-40
AFTRADD	.BYTE	2,40	;0,0
PRVADHI	=	DIRADHI
PRVADLO	.BYTE	0,0,-2,-40
;
;JOYSTICK TO INTERNAL DIR CONVERSION
;
CONVERT	.BYTE	4,3,1,4,2,4,4,4,0,4,4
;
;OFFSET FOR STILL IMAGE INTO SHAPES
;
SHSTOFS	.BYTE	2,6,8,12
;
;EVAPORATION VOLUMES
;
EXPNVLP	.BYTE	4,6,8,8,6,6,4,4,4,2,2,2
;
;ZIGZAG DIRECTION MASKS
;
XYMASK	.BYTE	$03,$0C,$03,$0C
;
;BACKLASH DIRECTION BITS
;
DIRBIT	.BYTE	8,4,2,1
;
;SCREEN INDEX TO SCORES
;
SCRINDX	.BYTE	4,24,44,64
;
;SHAPE TABLES
;------------
;
;PLAYER/ZOMBIES
;
SHAPES	.BYTE	$00,$00,$C0,$C1	;R4
	.BYTE	$00,$00,$C3,$C5	;D4
	.BYTE	$D2,$D3,$00,$00	;L0
	.BYTE	$C0,$DE,$00,$00	;U0
	.BYTE	$DF,$C2,$DF,$DF	;R1
	.BYTE	$C6,$C7,$C8,$C9	;D1
	.BYTE	$DF,$D4,$DF,$DF	;L1
	.BYTE	$DC,$DD,$C8,$C9	;U1
	.BYTE	$DF,$C3,$C4,$DF	;R2
	.BYTE	$CA,$CB,$CC,$CD	;D2
	.BYTE	$DF,$D5,$D6,$DF	;L2
	.BYTE	$CA,$D9,$DA,$DB	;U2
	.BYTE	$DF,$DF,$C2,$DF	;R3
	.BYTE	$CE,$CF,$D0,$D1	;D3
	.BYTE	$DF,$DF,$D4,$DF	;L3
	.BYTE	$CE,$CF,$D7,$D8	;U3
;
;SHOTS
;
SHOTSHP	.BYTE	$00,$00,$81,$82	;R2
	.BYTE	$00,$00,$84,$00	;D2
	.BYTE	$81,$82,$00,$00	;L0
	.BYTE	$00,$84,$00,$00	;U0
	.BYTE	$00,$82,$81,$00	;R1
	.BYTE	$83,$00,$85,$00	;D1
	.BYTE	$00,$82,$81,$00	;L1
	.BYTE	$00,$83,$00,$85	;U1
;
;BACKLASH SHRAPNEL
;
EXPLSHP	.BYTE	$00,$9B,$9C,$9C	;R&D0
	.BYTE	$9B,$00,$9D,$9D	;L&U0
	.BYTE	$9B,$00,$9D,$9D	;R&D1
	.BYTE	$00,$9B,$9C,$9C	;L&U1
;
;TITLE SCREEN
;------------
;
;DISPLAY LIST
;
TITLDISP	.BYTE	$70,$70,$70,$70,$70,$42
	.WORD	TITLES
	.BYTE	2,2,$70,6,$70,$70,5,$70
	.BYTE	$70,6,$70,4,4,4,$70,6,6
	.BYTE	$70,2,$41
	.WORD	TITLDISP
;
;TITLE SCREEN DISPLAY DATA
;
TITLES	.BYTE	0,0,0,0,0,0,0,0,96
	.SBYTE	"abcdefg"
	.BYTE	96
	.SBYTE	"abchi  jklcjmno"
	.SBYTE	"                "
	.SBYTE	"pqrsptuspqr"
	.SBYTE	"spvwxpyzsp"
	.BYTE	123,124,115,0,0
	.BYTE	0,0,0,0,0,0
	.SBYTE	"               "
	.SBYTE	"COMPUTING      "
	.SBYTE	"                "
	.SBYTE	+$80,"presents   "
	.SBYTE	"                "
	.SBYTE	+$80,">?FHJQVX [\]^_"
	.SBYTE	"                "
	.SBYTE	"BY  MARK PRICE   "
WLKLINE	.SBYTE	"                    "
	.SBYTE	"                    "
	.BYTE	253,253,253,253,253
	.BYTE	253,253,253,253,253
	.BYTE	253,253,253,253,253
	.BYTE	253,253,253,253,253
	.BYTE	253,253,253,253,253
	.BYTE	253,253,253,253,253
	.BYTE	253,253,253,253,253
	.BYTE	253,253,253,253,253
	.BYTE	254,254,254,254,254
	.BYTE	254,254,254,254,254
	.BYTE	254,254,254,254,254
	.BYTE	254,254,254,254,254
	.BYTE	254,254,254,254,254
	.BYTE	254,254,254,254,254
	.BYTE	254,254,254,254,254
	.BYTE	254,254,254,254,254
	.SBYTE	+$80,"     wizards"
	.BYTE	218,0
PLAYERS	.BYTE	81
	.SBYTE	"          ZOMBIES: "
ZOMBIES	.BYTE	80,0,0,0,0,0
	.SBYTE	"            "
	.SBYTE	"ZOMBIE SPEED:  "
ZOMSPD	.SBYTE	"5            "
;
;GAME DISPLAY DATA
;-----------------
;
;DISPLAY LIST
;
GAME	.BYTE	$70,$70,$70,$44
	.WORD	GAMESCR
	.BYTE	4,4,4,4,4,4,4,4,4,4,4
	.BYTE	4,4,4,4,4,4,4,$F0,$46
	.WORD	BOTSCRN
	.BYTE	6,6,6,$41
	.WORD	GAME
;
;MAZE DATA
;
MAZEDAT	.SBYTE	+$80,"@@@@@@@@@@"
	.SBYTE	+$80,"@@@@@@@@@@"
	.BYTE	160,0,0,0,253
	.BYTE	253,0,0,0,0
	.BYTE	0,0,0,0,0
	.BYTE	0,0,0,0,160
	.BYTE	160,0,254,0,0
	.BYTE	254,0,254,254,254
	.BYTE	254,0,254,254,254
	.BYTE	254,0,254,254,160
	.BYTE	160,0,255,0,255
	.BYTE	255,0,0,0,255
	.BYTE	0,0,0,255,0
	.BYTE	0,0,255,0,160
	.BYTE	160,0,253,0,0
	.BYTE	0,0,253,0,0
	.BYTE	0,253,0,0,0
	.BYTE	253,0,253,0,160
	.BYTE	160,254,254,0,254
	.BYTE	254,254,254,254,254
	.BYTE	254,254,0,254,254
	.BYTE	254,0,254,0,160
	.BYTE	160,0,0,0,255
	.BYTE	0,0,0,0,0
	.BYTE	0,255,0,0,0
	.BYTE	0,0,0,0,160
	.BYTE	160,0,253,253,253
	.BYTE	0,253,253,0,253
	.BYTE	0,253,0,253,253
	.BYTE	253,253,253,253,160
	.BYTE	160,0,0,0,0
	.BYTE	0,0,254,0,254
	.BYTE	0,0,0,254,0
	.BYTE	0,0,0,0,160
	.BYTE	160,255,255,0,255
	.BYTE	255,0,255,0,255
	.BYTE	0,255,255,255,0
	.BYTE	255,255,255,255,160
	.BYTE	160,0,0,0,0
	.BYTE	0,0,0,0,0
	.BYTE	0,0,0,0,0
	.BYTE	253,0,0,0,160
	.BYTE	160,0,254,254,254
	.BYTE	0,254,254,254,254
	.BYTE	0,254,254,254,0
	.BYTE	254,254,254,0,160
	.BYTE	160,0,255,0,0
	.BYTE	0,0,0,0,0
	.BYTE	0,255,0,0,0
	.BYTE	0,0,255,0,160
	.BYTE	160,0,253,0,253
	.BYTE	253,253,253,253,253
	.BYTE	0,0,0,253,253
	.BYTE	253,0,0,0,160
	.BYTE	160,0,254,0,0
	.BYTE	254,0,0,0,254
	.BYTE	0,254,0,0,0
	.BYTE	0,0,254,254,160
	.BYTE	160,0,255,0,255
	.BYTE	255,0,255,0,255
	.BYTE	0,255,255,255,255
	.BYTE	255,0,0,0,160
	.BYTE	160,0,253,0,0
	.BYTE	253,0,253,0,253
	.BYTE	0,253,0,0,0
	.BYTE	253,253,253,0,160
	.BYTE	160,0,0,0,0
	.BYTE	0,0,0,0,0
	.BYTE	0,0,0,254,0
	.BYTE	0,0,0,0,160
	.SBYTE	+$80,"@@@@@@@@@@"
	.SBYTE	+$80,"@@@@@@@@@@"
;
;TEXT MESSAGES
;-------------
;
PLRTXT	.SBYTE	"WIZARDwizard"
	.SBYTE	+$80,"WIZARDwizard"
ZOMTXT	.SBYTE	"ZOMBIEzombie"
	.SBYTE	+$80,"ZOMBIEzombie"
ENDTXT	.SBYTE	"WINS"
;
;GAME SCREEN SPACE
;-----------------
;
GAMESCR	.DS	760
BOTSCRN	.DS	11
SCORE	.DS	69
;
	*=	$02E0
	.WORD	INIT
;
	.END