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205 lines
3.5 KiB
Plaintext
205 lines
3.5 KiB
Plaintext
;Atari 2600 Initialization Code - C02 Assembly Language File
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PLR0X EQU $80
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PLR1X EQU $81
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MSL0X EQU $82
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MSL1X EQU $83
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BALLX EQU $84
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OBJTY EQU $85
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PLR0Y EQU $85
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PLR1Y EQU $86
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MSL1HT EQU $87
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MSL1Y EQU $88
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BALLY EQU $89
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PLR0LO EQU $8A
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PLR0HI EQU $8B
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PLR1LO EQU $8C
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PLR1HI EQU $8D
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PLR0HT EQU $8E
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PLR1HT EQU $8F
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MSL0HT EQU $90
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MSL0Y EQU $91
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BALLHT EQU $92
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SCORE EQU $93 ; $93-$95
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SCOREPOINTERS EQU $96 ; $96-$9B EQU 6 BYTES
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TEMP1 EQU $9C ;USED BY KERNEL
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TEMP2 EQU $9D ;CAN BE USED IN PROGRAM TOO, BUT
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TEMP3 EQU $9E ;ARE OBLITERATED WHEN DRAWSCREEN IS CALLED.
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TEMP4 EQU $9F
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TEMP5 EQU $A0
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TEMP6 EQU $A1
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RAND EQU $A2
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SCORECOLOR EQU $A3
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VAR0 EQU $A4
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VAR1 EQU $A5
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VAR2 EQU $A6
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VAR3 EQU $A7
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VAR4 EQU $A8
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VAR5 EQU $A9
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VAR6 EQU $AA
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VAR7 EQU $AB
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VAR8 EQU $AC
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VAR9 EQU $AD
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VAR10 EQU $AE
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VAR11 EQU $AF
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VAR12 EQU $B0
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VAR13 EQU $B1
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VAR14 EQU $B2
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VAR15 EQU $B3
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VAR16 EQU $B4
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VAR17 EQU $B5
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VAR18 EQU $B6
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VAR19 EQU $B7
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VAR20 EQU $B8
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VAR21 EQU $B9
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VAR22 EQU $BA
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VAR23 EQU $BB
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VAR24 EQU $BC
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VAR25 EQU $BD
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VAR26 EQU $BE
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VAR27 EQU $BF
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VAR28 EQU $C0
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VAR29 EQU $C1
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VAR30 EQU $C2
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VAR31 EQU $C3
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VAR32 EQU $C4
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VAR33 EQU $C5
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VAR34 EQU $C6
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VAR35 EQU $C7
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VAR36 EQU $C8
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VAR37 EQU $C9
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VAR38 EQU $CA
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VAR39 EQU $CB
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VAR40 EQU $CC
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VAR41 EQU $CD
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VAR42 EQU $CE
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VAR43 EQU $CF
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VAR44 EQU $D0
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VAR45 EQU $D1
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VAR46 EQU $D2
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VAR47 EQU $D3
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TEMP7 EQU $D4 ; THIS IS USED TO AID IN BANKSWITCHING
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PLAYFIELDPOS EQU $D5
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A EQU $D6
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B EQU $D7
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C EQU $D8
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D EQU $D9
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E EQU $DA
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F EQU $DB
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G EQU $DC
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H EQU $DD
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I EQU $DE
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J EQU $DF
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K EQU $E0
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L EQU $E1
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M EQU $E2
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N EQU $E3
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O EQU $E4
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P EQU $E5
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Q EQU $E6
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R EQU $E7
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S EQU $E8
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T EQU $E9
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U EQU $EA
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V EQU $EB
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W EQU $EC
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X EQU $ED
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Y EQU $EE
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Z EQU $EF
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; AVAILABLE FOR OTHER USES, OR IF UNUSED, PROVIDE MORE STACK SPACE
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AUX1 EQU $F0
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AUX2 EQU $F1
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AUX3 EQU $F2
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AUX4 EQU $F3
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AUX5 EQU $F4
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AUX6 EQU $F5
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; PLAYFIELD COLOR/HT POINTERS
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PFCOLORTABLE EQU $F0 ; AND $D5
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PFHTTABLE EQU $F0 ; AND $D5
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; THE ABOVE POINTERS ARE THE SAME BECAUSE IF COLOR AND HT ARE BOTH USED TOGETHER,
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; THEY MUST USED ABSOLUTE INDEXED AND CANNOT USE POINTERS
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LIFEPOINTER EQU $F2 ; POINTER TO "LIVES" SHAPE
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; UPPER 3 BITS OF $F2 CONTAIN THE NUMBER OF LIVES
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LIFECOLOR EQU $F4
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LIVES EQU $F3 ; # LIVES >> 5
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STATUSBARLENGTH EQU $F5 ; ONLY USES UPPER 5 BITS; OTHER BITS FREE
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PFSCORE1 EQU $F2 ; OPTIONAL PLAYFIELD BYTES IN SCORE
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PFSCORE2 EQU $F3
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PFSCORECOLOR EQU $F4
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STACK1 EQU $F6
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STACK2 EQU $F7
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STACK3 EQU $F8
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STACK4 EQU $F9
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START: SEI ;Disable Interrupts
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CLD ;Disable Decimal Modes
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LDY #0 ;Set Y-Index to $00
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LDA $D0 ;If Location $D0
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CMP #$2C ; Does Not Contain $2C
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BNE IS2600 ;And
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LDA $D1 ; Location $D1
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CMP #$A9 ; Does Not Contain $D1
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BNE IS2600 ;Then
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DEY ; Set Y-Index to $FF
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IS2600: LDX #0 ;Initialize X-Index
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TXA ;Initialize Accumulator
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CLRMEM: INX ;
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TXS ;
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PHA
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BNE CLRMEM
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STY TEMP1
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IFCONST PFROWHT
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LDA PFROWHT
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ELSE
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IFCONST PFRES
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LDA #(96/PFRES)
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ELSE
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LDA #8
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ENDIF
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ENDIF
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STA PLAYFIELDPOS
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LDX #5
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INITSCORE
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LDA #<SCORETABLE
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STA SCOREPOINTERS,X
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DEX
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BPL INITSCORE
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LDA #1
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STA CTRLPF
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ORA INTIM
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STA RAND
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IFCONST MULTISPRITE
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JSR MULTISPRITE_SETUP
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ENDIF
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IFNCONST BANKSWITCH
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JMP GAME
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ELSE
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LDA #>(GAME-1)
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PHA
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LDA #<(GAME-1)
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PHA
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PHA
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PHA
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LDX #1
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JMP BS_JSR
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ENDIF
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