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smb.asm
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smb.asm
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;SMBDIS.ASM - A COMPREHENSIVE SUPER MARIO BROS. DISASSEMBLY
; https://gist.github.com/1wErt3r/4048722
;by doppelganger (doppelheathen@gmail.com)
;edited and collected by Jakiki6
;This file is provided for your own use as-is.
;There are so many people I have to thank for this, that taking all the credit for
;myself would be an unforgivable act of arrogance. Without their help this would
;probably not be possible. So I thank all the peeps in the nesdev scene whose insight into
;the 6502 and the NES helped me learn how it works (you guys know who you are, there's no
;way I could have done this without your help), as well as the authors of x816 and SMB
;Utility, and the reverse-engineers who did the original Super Mario Bros. Hacking Project,
;which I compared notes with but did not copy from. Last but certainly not least, I thank
;Nintendo for creating this game and the NES, without which this disassembly would
;only be theory.
;-------------------------------------------------------------------------------------
;DEFINES
;NES specific hardware defines
PPU_CTRL_REG1 = $2000
PPU_CTRL_REG2 = $2001
PPU_STATUS = $2002
PPU_SPR_ADDR = $2003
PPU_SPR_DATA = $2004
PPU_SCROLL_REG = $2005
PPU_ADDRESS = $2006
PPU_DATA = $2007
SND_REGISTER = $4000
SND_SQUARE1_REG = $4000
SND_SQUARE2_REG = $4004
SND_TRIANGLE_REG = $4008
SND_NOISE_REG = $400c
SND_DELTA_REG = $4010
SND_MASTERCTRL_REG = $4015
SPR_DMA = $4014
JOYPAD_PORT = $4016
JOYPAD_PORT1 = $4016
JOYPAD_PORT2 = $4017
; GAME SPECIFIC DEFINES
ObjectOffset = $08
FrameCounter = $09
SavedJoypadBits = $06fc
SavedJoypad1Bits = $06fc
SavedJoypad2Bits = $06fd
JoypadBitMask = $074a
JoypadOverride = $0758
A_B_Buttons = $0a
PreviousA_B_Buttons = $0d
Up_Down_Buttons = $0b
Left_Right_Buttons = $0c
GameEngineSubroutine = $0e
Mirror_PPU_CTRL_REG1 = $0778
Mirror_PPU_CTRL_REG2 = $0779
OperMode = $0770
OperMode_Task = $0772
ScreenRoutineTask = $073c
GamePauseStatus = $0776
GamePauseTimer = $0777
DemoAction = $0717
DemoActionTimer = $0718
TimerControl = $0747
IntervalTimerControl = $077f
Timers = $0780
SelectTimer = $0780
PlayerAnimTimer = $0781
JumpSwimTimer = $0782
RunningTimer = $0783
BlockBounceTimer = $0784
SideCollisionTimer = $0785
JumpspringTimer = $0786
GameTimerCtrlTimer = $0787
ClimbSideTimer = $0789
EnemyFrameTimer = $078a
FrenzyEnemyTimer = $078f
BowserFireBreathTimer = $0790
StompTimer = $0791
AirBubbleTimer = $0792
ScrollIntervalTimer = $0795
EnemyIntervalTimer = $0796
BrickCoinTimer = $079d
InjuryTimer = $079e
StarInvincibleTimer = $079f
ScreenTimer = $07a0
WorldEndTimer = $07a1
DemoTimer = $07a2
Sprite_Data = $0200
Sprite_Y_Position = $0200
Sprite_Tilenumber = $0201
Sprite_Attributes = $0202
Sprite_X_Position = $0203
ScreenEdge_PageLoc = $071a
ScreenEdge_X_Pos = $071c
ScreenLeft_PageLoc = $071a
ScreenRight_PageLoc = $071b
ScreenLeft_X_Pos = $071c
ScreenRight_X_Pos = $071d
PlayerFacingDir = $33
DestinationPageLoc = $34
VictoryWalkControl = $35
ScrollFractional = $0768
PrimaryMsgCounter = $0719
SecondaryMsgCounter = $0749
HorizontalScroll = $073f
VerticalScroll = $0740
ScrollLock = $0723
ScrollThirtyTwo = $073d
Player_X_Scroll = $06ff
Player_Pos_ForScroll = $0755
ScrollAmount = $0775
AreaData = $e7
AreaDataLow = $e7
AreaDataHigh = $e8
EnemyData = $e9
EnemyDataLow = $e9
EnemyDataHigh = $ea
AreaParserTaskNum = $071f
ColumnSets = $071e
CurrentPageLoc = $0725
CurrentColumnPos = $0726
BackloadingFlag = $0728
BehindAreaParserFlag = $0729
AreaObjectPageLoc = $072a
AreaObjectPageSel = $072b
AreaDataOffset = $072c
AreaObjOffsetBuffer = $072d
AreaObjectLength = $0730
StaircaseControl = $0734
AreaObjectHeight = $0735
MushroomLedgeHalfLen = $0736
EnemyDataOffset = $0739
EnemyObjectPageLoc = $073a
EnemyObjectPageSel = $073b
MetatileBuffer = $06a1
BlockBufferColumnPos = $06a0
CurrentNTAddr_Low = $0721
CurrentNTAddr_High = $0720
AttributeBuffer = $03f9
LoopCommand = $0745
DisplayDigits = $07d7
TopScoreDisplay = $07d7
ScoreAndCoinDisplay = $07dd
PlayerScoreDisplay = $07dd
GameTimerDisplay = $07f8
DigitModifier = $0134
VerticalFlipFlag = $0109
FloateyNum_Control = $0110
ShellChainCounter = $0125
FloateyNum_Timer = $012c
FloateyNum_X_Pos = $0117
FloateyNum_Y_Pos = $011e
FlagpoleFNum_Y_Pos = $010d
FlagpoleFNum_YMFDummy = $010e
FlagpoleScore = $010f
FlagpoleCollisionYPos = $070f
StompChainCounter = $0484
VRAM_Buffer1_Offset = $0300
VRAM_Buffer1 = $0301
VRAM_Buffer2_Offset = $0340
VRAM_Buffer2 = $0341
VRAM_Buffer_AddrCtrl = $0773
Sprite0HitDetectFlag = $0722
DisableScreenFlag = $0774
DisableIntermediate = $0769
ColorRotateOffset = $06d4
TerrainControl = $0727
AreaStyle = $0733
ForegroundScenery = $0741
BackgroundScenery = $0742
CloudTypeOverride = $0743
BackgroundColorCtrl = $0744
AreaType = $074e
AreaAddrsLOffset = $074f
AreaPointer = $0750
PlayerEntranceCtrl = $0710
GameTimerSetting = $0715
AltEntranceControl = $0752
EntrancePage = $0751
NumberOfPlayers = $077a
WarpZoneControl = $06d6
ChangeAreaTimer = $06de
MultiLoopCorrectCntr = $06d9
MultiLoopPassCntr = $06da
FetchNewGameTimerFlag = $0757
GameTimerExpiredFlag = $0759
PrimaryHardMode = $076a
SecondaryHardMode = $06cc
WorldSelectNumber = $076b
WorldSelectEnableFlag = $07fc
ContinueWorld = $07fd
CurrentPlayer = $0753
PlayerSize = $0754
PlayerStatus = $0756
OnscreenPlayerInfo = $075a
NumberofLives = $075a ;used by current player
HalfwayPage = $075b
LevelNumber = $075c ;the actual dash number
Hidden1UpFlag = $075d
CoinTally = $075e
WorldNumber = $075f
AreaNumber = $0760 ;internal number used to find areas
CoinTallyFor1Ups = $0748
OffscreenPlayerInfo = $0761
OffScr_NumberofLives = $0761 ;used by offscreen player
OffScr_HalfwayPage = $0762
OffScr_LevelNumber = $0763
OffScr_Hidden1UpFlag = $0764
OffScr_CoinTally = $0765
OffScr_WorldNumber = $0766
OffScr_AreaNumber = $0767
BalPlatformAlignment = $03a0
Platform_X_Scroll = $03a1
PlatformCollisionFlag = $03a2
YPlatformTopYPos = $0401
YPlatformCenterYPos = $58
BrickCoinTimerFlag = $06bc
StarFlagTaskControl = $0746
PseudoRandomBitReg = $07a7
WarmBootValidation = $07ff
SprShuffleAmtOffset = $06e0
SprShuffleAmt = $06e1
SprDataOffset = $06e4
Player_SprDataOffset = $06e4
Enemy_SprDataOffset = $06e5
Block_SprDataOffset = $06ec
Alt_SprDataOffset = $06ec
Bubble_SprDataOffset = $06ee
FBall_SprDataOffset = $06f1
Misc_SprDataOffset = $06f3
SprDataOffset_Ctrl = $03ee
Player_State = $1d
Enemy_State = $1e
Fireball_State = $24
Block_State = $26
Misc_State = $2a
Player_MovingDir = $45
Enemy_MovingDir = $46
SprObject_X_Speed = $57
Player_X_Speed = $57
Enemy_X_Speed = $58
Fireball_X_Speed = $5e
Block_X_Speed = $60
Misc_X_Speed = $64
Jumpspring_FixedYPos = $58
JumpspringAnimCtrl = $070e
JumpspringForce = $06db
SprObject_PageLoc = $6d
Player_PageLoc = $6d
Enemy_PageLoc = $6e
Fireball_PageLoc = $74
Block_PageLoc = $76
Misc_PageLoc = $7a
Bubble_PageLoc = $83
SprObject_X_Position = $86
Player_X_Position = $86
Enemy_X_Position = $87
Fireball_X_Position = $8d
Block_X_Position = $8f
Misc_X_Position = $93
Bubble_X_Position = $9c
SprObject_Y_Speed = $9f
Player_Y_Speed = $9f
Enemy_Y_Speed = $a0
Fireball_Y_Speed = $a6
Block_Y_Speed = $a8
Misc_Y_Speed = $ac
SprObject_Y_HighPos = $b5
Player_Y_HighPos = $b5
Enemy_Y_HighPos = $b6
Fireball_Y_HighPos = $bc
Block_Y_HighPos = $be
Misc_Y_HighPos = $c2
Bubble_Y_HighPos = $cb
SprObject_Y_Position = $ce
Player_Y_Position = $ce
Enemy_Y_Position = $cf
Fireball_Y_Position = $d5
Block_Y_Position = $d7
Misc_Y_Position = $db
Bubble_Y_Position = $e4
SprObject_Rel_XPos = $03ad
Player_Rel_XPos = $03ad
Enemy_Rel_XPos = $03ae
Fireball_Rel_XPos = $03af
Bubble_Rel_XPos = $03b0
Block_Rel_XPos = $03b1
Misc_Rel_XPos = $03b3
SprObject_Rel_YPos = $03b8
Player_Rel_YPos = $03b8
Enemy_Rel_YPos = $03b9
Fireball_Rel_YPos = $03ba
Bubble_Rel_YPos = $03bb
Block_Rel_YPos = $03bc
Misc_Rel_YPos = $03be
SprObject_SprAttrib = $03c4
Player_SprAttrib = $03c4
Enemy_SprAttrib = $03c5
SprObject_X_MoveForce = $0400
Enemy_X_MoveForce = $0401
SprObject_YMF_Dummy = $0416
Player_YMF_Dummy = $0416
Enemy_YMF_Dummy = $0417
Bubble_YMF_Dummy = $042c
SprObject_Y_MoveForce = $0433
Player_Y_MoveForce = $0433
Enemy_Y_MoveForce = $0434
Block_Y_MoveForce = $043c
DisableCollisionDet = $0716
Player_CollisionBits = $0490
Enemy_CollisionBits = $0491
SprObj_BoundBoxCtrl = $0499
Player_BoundBoxCtrl = $0499
Enemy_BoundBoxCtrl = $049a
Fireball_BoundBoxCtrl = $04a0
Misc_BoundBoxCtrl = $04a2
EnemyFrenzyBuffer = $06cb
EnemyFrenzyQueue = $06cd
Enemy_Flag = $0f
Enemy_ID = $16
PlayerGfxOffset = $06d5
Player_XSpeedAbsolute = $0700
FrictionAdderHigh = $0701
FrictionAdderLow = $0702
RunningSpeed = $0703
SwimmingFlag = $0704
Player_X_MoveForce = $0705
DiffToHaltJump = $0706
JumpOrigin_Y_HighPos = $0707
JumpOrigin_Y_Position = $0708
VerticalForce = $0709
VerticalForceDown = $070a
PlayerChangeSizeFlag = $070b
PlayerAnimTimerSet = $070c
PlayerAnimCtrl = $070d
DeathMusicLoaded = $0712
FlagpoleSoundQueue = $0713
CrouchingFlag = $0714
MaximumLeftSpeed = $0450
MaximumRightSpeed = $0456
SprObject_OffscrBits = $03d0
Player_OffscreenBits = $03d0
Enemy_OffscreenBits = $03d1
FBall_OffscreenBits = $03d2
Bubble_OffscreenBits = $03d3
Block_OffscreenBits = $03d4
Misc_OffscreenBits = $03d6
EnemyOffscrBitsMasked = $03d8
Cannon_Offset = $046a
Cannon_PageLoc = $046b
Cannon_X_Position = $0471
Cannon_Y_Position = $0477
Cannon_Timer = $047d
Whirlpool_Offset = $046a
Whirlpool_PageLoc = $046b
Whirlpool_LeftExtent = $0471
Whirlpool_Length = $0477
Whirlpool_Flag = $047d
VineFlagOffset = $0398
VineHeight = $0399
VineObjOffset = $039a
VineStart_Y_Position = $039d
Block_Orig_YPos = $03e4
Block_BBuf_Low = $03e6
Block_Metatile = $03e8
Block_PageLoc2 = $03ea
Block_RepFlag = $03ec
Block_ResidualCounter = $03f0
Block_Orig_XPos = $03f1
BoundingBox_UL_XPos = $04ac
BoundingBox_UL_YPos = $04ad
BoundingBox_DR_XPos = $04ae
BoundingBox_DR_YPos = $04af
BoundingBox_UL_Corner = $04ac
BoundingBox_LR_Corner = $04ae
EnemyBoundingBoxCoord = $04b0
PowerUpType = $39
FireballBouncingFlag = $3a
FireballCounter = $06ce
FireballThrowingTimer = $0711
HammerEnemyOffset = $06ae
JumpCoinMiscOffset = $06b7
Block_Buffer_1 = $0500
Block_Buffer_2 = $05d0
HammerThrowingTimer = $03a2
HammerBroJumpTimer = $3c
Misc_Collision_Flag = $06be
RedPTroopaOrigXPos = $0401
RedPTroopaCenterYPos = $58
XMovePrimaryCounter = $a0
XMoveSecondaryCounter = $58
CheepCheepMoveMFlag = $58
CheepCheepOrigYPos = $0434
BitMFilter = $06dd
LakituReappearTimer = $06d1
LakituMoveSpeed = $58
LakituMoveDirection = $a0
FirebarSpinState_Low = $58
FirebarSpinState_High = $a0
FirebarSpinSpeed = $0388
FirebarSpinDirection = $34
DuplicateObj_Offset = $06cf
NumberofGroupEnemies = $06d3
BlooperMoveCounter = $a0
BlooperMoveSpeed = $58
BowserBodyControls = $0363
BowserFeetCounter = $0364
BowserMovementSpeed = $0365
BowserOrigXPos = $0366
BowserFlameTimerCtrl = $0367
BowserFront_Offset = $0368
BridgeCollapseOffset = $0369
BowserGfxFlag = $036a
BowserHitPoints = $0483
MaxRangeFromOrigin = $06dc
BowserFlamePRandomOfs = $0417
PiranhaPlantUpYPos = $0417
PiranhaPlantDownYPos = $0434
PiranhaPlant_Y_Speed = $58
PiranhaPlant_MoveFlag = $a0
FireworksCounter = $06d7
ExplosionGfxCounter = $58
ExplosionTimerCounter = $a0
;sound related defines
Squ2_NoteLenBuffer = $07b3
Squ2_NoteLenCounter = $07b4
Squ2_EnvelopeDataCtrl = $07b5
Squ1_NoteLenCounter = $07b6
Squ1_EnvelopeDataCtrl = $07b7
Tri_NoteLenBuffer = $07b8
Tri_NoteLenCounter = $07b9
Noise_BeatLenCounter = $07ba
Squ1_SfxLenCounter = $07bb
Squ2_SfxLenCounter = $07bd
Sfx_SecondaryCounter = $07be
Noise_SfxLenCounter = $07bf
PauseSoundQueue = $fa
Square1SoundQueue = $ff
Square2SoundQueue = $fe
NoiseSoundQueue = $fd
AreaMusicQueue = $fb
EventMusicQueue = $fc
Square1SoundBuffer = $f1
Square2SoundBuffer = $f2
NoiseSoundBuffer = $f3
AreaMusicBuffer = $f4
EventMusicBuffer = $07b1
PauseSoundBuffer = $07b2
MusicData = $f5
MusicDataLow = $f5
MusicDataHigh = $f6
MusicOffset_Square2 = $f7
MusicOffset_Square1 = $f8
MusicOffset_Triangle = $f9
MusicOffset_Noise = $07b0
NoteLenLookupTblOfs = $f0
DAC_Counter = $07c0
NoiseDataLoopbackOfs = $07c1
NoteLengthTblAdder = $07c4
AreaMusicBuffer_Alt = $07c5
PauseModeFlag = $07c6
GroundMusicHeaderOfs = $07c7
AltRegContentFlag = $07ca
;-------------------------------------------------------------------------------------
;CONSTANTS
;sound effects constants
Sfx_SmallJump = %10000000
Sfx_Flagpole = %01000000
Sfx_Fireball = %00100000
Sfx_PipeDown_Injury = %00010000
Sfx_EnemySmack = %00001000
Sfx_EnemyStomp = %00000100
Sfx_Bump = %00000010
Sfx_BigJump = %00000001
Sfx_BowserFall = %10000000
Sfx_ExtraLife = %01000000
Sfx_PowerUpGrab = %00100000
Sfx_TimerTick = %00010000
Sfx_Blast = %00001000
Sfx_GrowVine = %00000100
Sfx_GrowPowerUp = %00000010
Sfx_CoinGrab = %00000001
Sfx_BowserFlame = %00000010
Sfx_BrickShatter = %00000001
;music constants
Silence = %10000000
StarPowerMusic = %01000000
PipeIntroMusic = %00100000
CloudMusic = %00010000
CastleMusic = %00001000
UndergroundMusic = %00000100
WaterMusic = %00000010
GroundMusic = %00000001
TimeRunningOutMusic = %01000000
EndOfLevelMusic = %00100000
AltGameOverMusic = %00010000
EndOfCastleMusic = %00001000
VictoryMusic = %00000100
GameOverMusic = %00000010
DeathMusic = %00000001
;enemy object constants
GreenKoopa = $00
BuzzyBeetle = $02
RedKoopa = $03
HammerBro = $05
Goomba = $06
Bloober = $07
BulletBill_FrenzyVar = $08
GreyCheepCheep = $0a
RedCheepCheep = $0b
Podoboo = $0c
PiranhaPlant = $0d
GreenParatroopaJump = $0e
RedParatroopa = $0f
GreenParatroopaFly = $10
Lakitu = $11
Spiny = $12
FlyCheepCheepFrenzy = $14
FlyingCheepCheep = $14
BowserFlame = $15
Fireworks = $16
BBill_CCheep_Frenzy = $17
Stop_Frenzy = $18
Bowser = $2d
PowerUpObject = $2e
VineObject = $2f
FlagpoleFlagObject = $30
StarFlagObject = $31
JumpspringObject = $32
BulletBill_CannonVar = $33
RetainerObject = $35
TallEnemy = $09
;other constants
World1 = 0
World2 = 1
World3 = 2
World4 = 3
World5 = 4
World6 = 5
World7 = 6
World8 = 7
Level1 = 0
Level2 = 1
Level3 = 2
Level4 = 3
WarmBootOffset = <$07d6
ColdBootOffset = <$07fe
TitleScreenDataOffset = $1ec0
SoundMemory = $07b0
SwimTileRepOffset = PlayerGraphicsTable + $9e
MusicHeaderOffsetData = MusicHeaderData - 1
MHD = MusicHeaderData
A_Button = %10000000
B_Button = %01000000
Select_Button = %00100000
Start_Button = %00010000
Up_Dir = %00001000
Down_Dir = %00000100
Left_Dir = %00000010
Right_Dir = %00000001
TitleScreenModeValue = 0
GameModeValue = 1
VictoryModeValue = 2
GameOverModeValue = 3
;-------------------------------------------------------------------------------------
;DIRECTIVES
; .index 8
; .mem 8
.db $4e, $45, $53, $1a, $02, $01, $01, $00, $00, $00, $00, $00, $00, $00, $00, $00
.org $8000
;-------------------------------------------------------------------------------------
Start:
sei ;pretty standard 6502 type init here
cld
lda #%00010000 ;init PPU control register 1
sta PPU_CTRL_REG1
ldx #$ff ;reset stack pointer
txs
VBlank1: lda PPU_STATUS ;wait two frames
bpl VBlank1
VBlank2: lda PPU_STATUS
bpl VBlank2
ldy #ColdBootOffset ;load default cold boot pointer
ldx #$05 ;this is where we check for a warm boot
WBootCheck: lda TopScoreDisplay,x ;check each score digit in the top score
cmp #10 ;to see if we have a valid digit
bcs ColdBoot ;if not, give up and proceed with cold boot
dex
bpl WBootCheck
lda WarmBootValidation ;second checkpoint, check to see if
cmp #$a5 ;another location has a specific value
bne ColdBoot
ldy #WarmBootOffset ;if passed both, load warm boot pointer
ColdBoot: jsr InitializeMemory ;clear memory using pointer in Y
sta SND_DELTA_REG+1 ;reset delta counter load register
sta OperMode ;reset primary mode of operation
lda #$a5 ;set warm boot flag
sta WarmBootValidation
sta PseudoRandomBitReg ;set seed for pseudorandom register
lda #%00001111
sta SND_MASTERCTRL_REG ;enable all sound channels except dmc
lda #%00000110
sta PPU_CTRL_REG2 ;turn off clipping for OAM and background
jsr MoveAllSpritesOffscreen
jsr InitializeNameTables ;initialize both name tables
inc DisableScreenFlag ;set flag to disable screen output
lda Mirror_PPU_CTRL_REG1
ora #%10000000 ;enable NMIs
jsr WritePPUReg1
EndlessLoop: jmp EndlessLoop ;endless loop, need I say more?
;-------------------------------------------------------------------------------------
;$00 - vram buffer address table low, also used for pseudorandom bit
;$01 - vram buffer address table high
VRAM_AddrTable_Low:
.db <VRAM_Buffer1, <WaterPaletteData, <GroundPaletteData
.db <UndergroundPaletteData, <CastlePaletteData, <VRAM_Buffer1_Offset
.db <VRAM_Buffer2, <VRAM_Buffer2, <BowserPaletteData
.db <DaySnowPaletteData, <NightSnowPaletteData, <MushroomPaletteData
.db <MarioThanksMessage, <LuigiThanksMessage, <MushroomRetainerSaved
.db <PrincessSaved1, <PrincessSaved2, <WorldSelectMessage1
.db <WorldSelectMessage2
VRAM_AddrTable_High:
.db >VRAM_Buffer1, >WaterPaletteData, >GroundPaletteData
.db >UndergroundPaletteData, >CastlePaletteData, >VRAM_Buffer1_Offset
.db >VRAM_Buffer2, >VRAM_Buffer2, >BowserPaletteData
.db >DaySnowPaletteData, >NightSnowPaletteData, >MushroomPaletteData
.db >MarioThanksMessage, >LuigiThanksMessage, >MushroomRetainerSaved
.db >PrincessSaved1, >PrincessSaved2, >WorldSelectMessage1
.db >WorldSelectMessage2
VRAM_Buffer_Offset:
.db <VRAM_Buffer1_Offset, <VRAM_Buffer2_Offset
NonMaskableInterrupt:
lda Mirror_PPU_CTRL_REG1 ;disable NMIs in mirror reg
and #%01111111 ;save all other bits
sta Mirror_PPU_CTRL_REG1
and #%01111110 ;alter name table address to be $2800
sta PPU_CTRL_REG1 ;(essentially $2000) but save other bits
lda Mirror_PPU_CTRL_REG2 ;disable OAM and background display by default
and #%11100110
ldy DisableScreenFlag ;get screen disable flag
bne ScreenOff ;if set, used bits as-is
lda Mirror_PPU_CTRL_REG2 ;otherwise reenable bits and save them
ora #%00011110
ScreenOff: sta Mirror_PPU_CTRL_REG2 ;save bits for later but not in register at the moment
and #%11100111 ;disable screen for now
sta PPU_CTRL_REG2
ldx PPU_STATUS ;reset flip-flop and reset scroll registers to zero
lda #$00
jsr InitScroll
sta PPU_SPR_ADDR ;reset spr-ram address register
lda #$02 ;perform spr-ram DMA access on $0200-$02ff
sta SPR_DMA
ldx VRAM_Buffer_AddrCtrl ;load control for pointer to buffer contents
lda VRAM_AddrTable_Low,x ;set indirect at $00 to pointer
sta $00
lda VRAM_AddrTable_High,x
sta $01
jsr UpdateScreen ;update screen with buffer contents
ldy #$00
ldx VRAM_Buffer_AddrCtrl ;check for usage of $0341
cpx #$06
bne InitBuffer
iny ;get offset based on usage
InitBuffer: ldx VRAM_Buffer_Offset,y
lda #$00 ;clear buffer header at last location
sta VRAM_Buffer1_Offset,x
sta VRAM_Buffer1,x
sta VRAM_Buffer_AddrCtrl ;reinit address control to $0301
lda Mirror_PPU_CTRL_REG2 ;copy mirror of $2001 to register
sta PPU_CTRL_REG2
jsr SoundEngine ;play sound
jsr ReadJoypads ;read joypads
jsr PauseRoutine ;handle pause
jsr UpdateTopScore
lda GamePauseStatus ;check for pause status
lsr
bcs PauseSkip
lda TimerControl ;if master timer control not set, decrement
beq DecTimers ;all frame and interval timers
dec TimerControl
bne NoDecTimers
DecTimers: ldx #$14 ;load end offset for end of frame timers
dec IntervalTimerControl ;decrement interval timer control,
bpl DecTimersLoop ;if not expired, only frame timers will decrement
lda #$14
sta IntervalTimerControl ;if control for interval timers expired,
ldx #$23 ;interval timers will decrement along with frame timers
DecTimersLoop: lda Timers,x ;check current timer
beq SkipExpTimer ;if current timer expired, branch to skip,
dec Timers,x ;otherwise decrement the current timer
SkipExpTimer: dex ;move onto next timer
bpl DecTimersLoop ;do this until all timers are dealt with
NoDecTimers: inc FrameCounter ;increment frame counter
PauseSkip: ldx #$00
ldy #$07
lda PseudoRandomBitReg ;get first memory location of LSFR bytes
and #%00000010 ;mask out all but d1
sta $00 ;save here
lda PseudoRandomBitReg+1 ;get second memory location
and #%00000010 ;mask out all but d1
eor $00 ;perform exclusive-OR on d1 from first and second bytes
clc ;if neither or both are set, carry will be clear
beq RotPRandomBit
sec ;if one or the other is set, carry will be set
RotPRandomBit: ror PseudoRandomBitReg,x ;rotate carry into d7, and rotate last bit into carry
inx ;increment to next byte
dey ;decrement for loop
bne RotPRandomBit
lda Sprite0HitDetectFlag ;check for flag here
beq SkipSprite0
Sprite0Clr: lda PPU_STATUS ;wait for sprite 0 flag to clear, which will
and #%01000000 ;not happen until vblank has ended
bne Sprite0Clr
lda GamePauseStatus ;if in pause mode, do not bother with sprites at all
lsr
bcs Sprite0Hit
jsr MoveSpritesOffscreen
jsr SpriteShuffler
Sprite0Hit: lda PPU_STATUS ;do sprite #0 hit detection
and #%01000000
beq Sprite0Hit
ldy #$14 ;small delay, to wait until we hit horizontal blank time
HBlankDelay: dey
bne HBlankDelay
SkipSprite0: lda HorizontalScroll ;set scroll registers from variables
sta PPU_SCROLL_REG
lda VerticalScroll
sta PPU_SCROLL_REG
lda Mirror_PPU_CTRL_REG1 ;load saved mirror of $2000
pha
sta PPU_CTRL_REG1
lda GamePauseStatus ;if in pause mode, do not perform operation mode stuff
lsr
bcs SkipMainOper
jsr OperModeExecutionTree ;otherwise do one of many, many possible subroutines
SkipMainOper: lda PPU_STATUS ;reset flip-flop
pla
ora #%10000000 ;reactivate NMIs
sta PPU_CTRL_REG1
rti ;we are done until the next frame!
;-------------------------------------------------------------------------------------
PauseRoutine:
lda OperMode ;are we in victory mode?
cmp #VictoryModeValue ;if so, go ahead
beq ChkPauseTimer
cmp #GameModeValue ;are we in game mode?
bne ExitPause ;if not, leave
lda OperMode_Task ;if we are in game mode, are we running game engine?
cmp #$03
bne ExitPause ;if not, leave
ChkPauseTimer: lda GamePauseTimer ;check if pause timer is still counting down
beq ChkStart
dec GamePauseTimer ;if so, decrement and leave
rts
ChkStart: lda SavedJoypad1Bits ;check to see if start is pressed
and #Start_Button ;on controller 1
beq ClrPauseTimer
lda GamePauseStatus ;check to see if timer flag is set
and #%10000000 ;and if so, do not reset timer (residual,
bne ExitPause ;joypad reading routine makes this unnecessary)
lda #$2b ;set pause timer
sta GamePauseTimer
lda GamePauseStatus
tay
iny ;set pause sfx queue for next pause mode
sty PauseSoundQueue
eor #%00000001 ;invert d0 and set d7
ora #%10000000
bne SetPause ;unconditional branch
ClrPauseTimer: lda GamePauseStatus ;clear timer flag if timer is at zero and start button
and #%01111111 ;is not pressed
SetPause: sta GamePauseStatus
ExitPause: rts
;-------------------------------------------------------------------------------------
;$00 - used for preset value
SpriteShuffler:
ldy AreaType ;load level type, likely residual code
lda #$28 ;load preset value which will put it at
sta $00 ;sprite #10
ldx #$0e ;start at the end of OAM data offsets
ShuffleLoop: lda SprDataOffset,x ;check for offset value against
cmp $00 ;the preset value
bcc NextSprOffset ;if less, skip this part
ldy SprShuffleAmtOffset ;get current offset to preset value we want to add
clc
adc SprShuffleAmt,y ;get shuffle amount, add to current sprite offset
bcc StrSprOffset ;if not exceeded $ff, skip second add
clc
adc $00 ;otherwise add preset value $28 to offset
StrSprOffset: sta SprDataOffset,x ;store new offset here or old one if branched to here
NextSprOffset: dex ;move backwards to next one
bpl ShuffleLoop
ldx SprShuffleAmtOffset ;load offset
inx
cpx #$03 ;check if offset + 1 goes to 3
bne SetAmtOffset ;if offset + 1 not 3, store
ldx #$00 ;otherwise, init to 0
SetAmtOffset: stx SprShuffleAmtOffset
ldx #$08 ;load offsets for values and storage
ldy #$02
SetMiscOffset: lda SprDataOffset+5,y ;load one of three OAM data offsets
sta Misc_SprDataOffset-2,x ;store first one unmodified, but
clc ;add eight to the second and eight
adc #$08 ;more to the third one
sta Misc_SprDataOffset-1,x ;note that due to the way X is set up,
clc ;this code loads into the misc sprite offsets
adc #$08
sta Misc_SprDataOffset,x
dex
dex
dex
dey
bpl SetMiscOffset ;do this until all misc spr offsets are loaded
rts
;-------------------------------------------------------------------------------------
OperModeExecutionTree:
lda OperMode ;this is the heart of the entire program,
jsr JumpEngine ;most of what goes on starts here
.dw TitleScreenMode
.dw GameMode
.dw VictoryMode
.dw GameOverMode
;-------------------------------------------------------------------------------------
MoveAllSpritesOffscreen:
ldy #$00 ;this routine moves all sprites off the screen
.db $2c ;BIT instruction opcode
MoveSpritesOffscreen:
ldy #$04 ;this routine moves all but sprite 0
lda #$f8 ;off the screen
SprInitLoop: sta Sprite_Y_Position,y ;write 248 into OAM data's Y coordinate
iny ;which will move it off the screen
iny
iny
iny
bne SprInitLoop
rts
;-------------------------------------------------------------------------------------
TitleScreenMode:
lda OperMode_Task
jsr JumpEngine
.dw InitializeGame
.dw ScreenRoutines
.dw PrimaryGameSetup
.dw GameMenuRoutine
;-------------------------------------------------------------------------------------
WSelectBufferTemplate:
.db $04, $20, $73, $01, $00, $00
GameMenuRoutine:
ldy #$00
lda SavedJoypad1Bits ;check to see if either player pressed
ora SavedJoypad2Bits ;only the start button (either joypad)
cmp #Start_Button
beq StartGame
cmp #A_Button+Start_Button ;check to see if A + start was pressed
bne ChkSelect ;if not, branch to check select button
StartGame: jmp ChkContinue ;if either start or A + start, execute here
ChkSelect: cmp #Select_Button ;check to see if the select button was pressed
beq SelectBLogic ;if so, branch reset demo timer
ldx DemoTimer ;otherwise check demo timer
bne ChkWorldSel ;if demo timer not expired, branch to check world selection
sta SelectTimer ;set controller bits here if running demo
jsr DemoEngine ;run through the demo actions
bcs ResetTitle ;if carry flag set, demo over, thus branch
jmp RunDemo ;otherwise, run game engine for demo
ChkWorldSel: ldx WorldSelectEnableFlag ;check to see if world selection has been enabled
beq NullJoypad
cmp #B_Button ;if so, check to see if the B button was pressed
bne NullJoypad
iny ;if so, increment Y and execute same code as select
SelectBLogic: lda DemoTimer ;if select or B pressed, check demo timer one last time
beq ResetTitle ;if demo timer expired, branch to reset title screen mode
lda #$18 ;otherwise reset demo timer
sta DemoTimer
lda SelectTimer ;check select/B button timer
bne NullJoypad ;if not expired, branch
lda #$10 ;otherwise reset select button timer
sta SelectTimer