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Castlevania III: Dracula's Curse/RAM map: Difference between revisions
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TheouAegis (talk | contribs) (Added audio engine mappings for AkuDen. Some bytes still missing or incorrect, in all honesty. Better than nothing!) |
m (Hawk moved page Castlevania III:RAM map to Castlevania III: Dracula's Curse/RAM map) |
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| (28 intermediate revisions by one other user not shown) | |||
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$0017 Repeat Counter | $0017 Repeat Counter | ||
$0018 System State | $0018 System State | ||
00 = Title; 02 = New Game; 03 = In-game Transition; 04 = In-Game; | ''00 = Title; 02 = New Game; 03 = In-game Transition; 04 = In-Game;'' | ||
05 = Game Over Transition; 06 = Game Over; 07 = Stage Select Debug; | ''05 = Game Over Transition; 06 = Game Over; 07 = Stage Select Debug;'' | ||
08 = Map Screen; 09 = Prayer Scene; 0a = Name Entry; 0b = Password Entry; | ''08 = Map Screen; 09 = Prayer Scene; 0a = Name Entry; 0b = Password Entry;'' | ||
0c = Epilogue; 0d = Credit Roll; 0e = Respawn; 0f = Sound Test Debug | ''0c = Epilogue; 0d = Credit Roll; 0e = Respawn; 0f = Sound Test Debug'' | ||
$0019 System Substate | $0019 System Substate | ||
$001A Step Counter | $001A System Step Counter | ||
$001B Radio Mode ''(halts most code except music) | |||
$001C Blackout Delay | $001C Blackout Delay | ||
$001D X Register Backup | |||
$001E Pausing Disabled ''(always 00?) | |||
$001F Randomizer | $001F Randomizer | ||
$0020 OAM Batch | |||
$0021 Current PROM Bank | |||
$0022 Previous PROM Bank | |||
$0023 PROM Bank Backup ''(used by some functions)'' | |||
$0024 Bank Changed ''(for debugging probably)'' | |||
$0025 Nametable Mapping | |||
$0026 #02 Controller Buttons Pressed | $0026 #02 Controller Buttons Pressed | ||
01 = right; 02 = left; 04 = down; 08 = up; | ''01 = right; 02 = left; 04 = down; 08 = up; | ||
10 = start; 20 = select; 40 = B; 80 = A | ''10 = start; 20 = select; 40 = B; 80 = A'' | ||
$0028 #02 Controller Buttons Held | $0028 #02 Controller Buttons Held | ||
$002A Game State | $002A Game State ''(set $006B to 00 before changing)'' | ||
$002B User Paused (toggled by Start button) | ''00 = initialize room; 01 = initialize nametables; 02 = load horizontal room; | ||
''03 = horizontal gameplay; 04 = load vertical room; 05 = vertical gameplay; | |||
''06 = stair transition start; 07 = stair transition fade; 08 = door transition; | |||
''09 = initialize fog; 0a = fog parallax; 0b = horizontal partner swap; | |||
''0c = vertical partner swap; 0d/0e = <CUT CONTENT>; 0f = detect automatic stairs; | |||
''10 = automatic stair transition; 11 = tally score; 12 = <UNUSED>; | |||
''13 = flee Aquarius; 14 = initialize flooding; 15 = load flood room; | |||
''16 = flood room gameplay; 17 = map transition; 18 = autowalk to door; | |||
''19 = powering up; 1a = freeze water; 1b = thaw ice; 1c = Bone King escape; | |||
''1d = Aquarius ruptured; 1e = initialize map transition; 1f = map transition exit | |||
$002B User Paused ''(toggled by Start button) | |||
$002C Boss Defeated | $002C Boss Defeated | ||
$002D Entry End ''(valid in Name screen, garbage in Pass screen) | |||
$002E Checkpoint | $002E Checkpoint | ||
$002F Grant Defeated | $002F Grant Defeated | ||
| Line 27: | Line 47: | ||
$0035 Lives | $0035 Lives | ||
$0036 #03 Score | $0036 #03 Score | ||
$0039 Main Character ''(change this to not always be Trevor) | |||
$003A Partner | $003A Partner | ||
00 = Trevor; 01 = Syfa; 02 = Grant; 03 = Alucard; ff = None | ''00 = Trevor; 01 = Syfa; 02 = Grant; 03 = Alucard; ff = None | ||
$003B Partner Active | $003B Partner Active | ||
$003C Player's Health | $003C Player's Health | ||
40 = full | ''40 = full | ||
$003D Boss Health | $003D Boss Health | ||
$003E Score Target (for extra life) | $003E Score Target ''(for extra life) | ||
$003F Default Drawing State (write to $006D) | $003F Default Drawing State ''(write to $006D) | ||
$0040 Scanline IRQ | |||
$0041 Scanline Target | |||
$0042 Default Vertical Scanline Target ''(write to $0089) | |||
$0043 Scanline Next Target | |||
$0044 #02 Draw State Address | |||
$0046 #08 CHR Banks | $0046 #08 CHR Banks | ||
$004E Hard Mode CHR Bank (overwrites $0049) | $004E Hard Mode CHR Bank ''(overwrites $0049) | ||
$0056 #02 View Position (little endian) | $0050 #02 Tile Assembly Starting Address | ||
$0052 #02 Tile Assembly Left Address | |||
$0054 #02 Tile Assembly Right Address | |||
$0056 #02 View Position ''(little endian) | |||
$0058 View Subpixel Position | $0058 View Subpixel Position | ||
$0059 Left Spawn Area | $0059 Left Spawn Area | ||
$005A Right Spawn Area | $005A Right Spawn Area | ||
$005C Tile Assembly | $005B Tile Assembly Count Left | ||
$005C Tile Assembly Count Right | |||
$005D #02 Tile Assembly Pointer | $005D #02 Tile Assembly Pointer | ||
$005F #02 Pallet Map Pointer | $005F #02 Pallet Map Pointer | ||
| Line 48: | Line 78: | ||
$0064 Transition Timer | $0064 Transition Timer | ||
$0065 Scroll Direction | $0065 Scroll Direction | ||
00 = left; 01 = right; 02 = unchanged | ''00 = left; 01 = right; 02 = unchanged | ||
$0066 View Refreshed Position | $0066 View Refreshed Position | ||
$0067 Update View | $0067 Update View | ||
$0068 Room Orientation | $0068 Room Orientation | ||
00 = horizontal; 80 or 81 = vertical; 82 = scroll up; | ''00 = horizontal; 80 or 81 = vertical; 82 = scroll up; | ||
83 = scroll down; 84 = collapse up; 85 = collapse down | ''83 = scroll down; 84 = collapse up; 85 = collapse down | ||
$0069 #02 Stair Map Address | $0069 #02 Stair Map Address | ||
$006B | $006B Menu selections | ||
Door State | |||
$006C Current Instance (saves X register) | ''00 = unopened; 01 = load next room; 02 = scroll in next room; | ||
''03 = unlatch door; 04 = open door; 05 = walk in; 06 = close door; | |||
''07 = latch door; 08 = scroll out old room; 09 = end transition | |||
$006C Current Instance ''(saves X register) | |||
$006D Drawing State | $006D Drawing State | ||
$006E View Speed | $006E View Speed | ||
| Line 63: | Line 96: | ||
$0071 Room Size | $0071 Room Size | ||
$0072 CHR Write Mode | $0072 CHR Write Mode | ||
00 or 03 = all CHR banks; 01 = status bar banks; 02 = clear NPC banks | ''00 or 03 = all CHR banks; 01 = status bar banks; 02 = clear NPC banks | ||
$0073 Previous Room Orientation | $0073 Previous Room Orientation | ||
$0074 Music Loaded | $0074 Music Loaded | ||
$0075 Transition Nametable (nametable to use after door closes) | $0075 Transition Nametable ''(nametable to use after door closes)'' | ||
$0076 Horizontal Spawner Block | $0076 Horizontal Spawner Block | ||
$0077 First Spawner Block | $0077 First Spawner Block | ||
| Line 73: | Line 106: | ||
$007A Vertical Spawner Previous (?) | $007A Vertical Spawner Previous (?) | ||
$007B Spawner Count | $007B Spawner Count | ||
$007C Vertical Partner Y-Coordinate ''(used for partner swap in vertical rooms) | |||
$007D Room Type | $007D Room Type | ||
10 = Stormclouds; 20 = Autowalk; 30 = River; 40 = Clockwork; | ''10 = Stormclouds; 20 = Autowalk; 30 = River; 40 = Clockwork; | ||
50 and 60 = Watery Grave; 70 = Flood Zone; 80 = Collapsing Bridge | ''50 and 60 = Watery Grave; 70 = Flood Zone; 80 = Collapsing Bridge | ||
Note: lower 4 bits alter behavior | ''Note: lower 4 bits alter behavior | ||
$007E #02 Time | $007E #02 Time | ||
$0080 Wounded Timer (invincibility frames) | $0080 Wounded Timer ''(invincibility frames) | ||
$0081 Damage Received | $0081 Damage Received/Effect on Player | ||
$0082 PC Height | $0082 PC Height | ||
00 = Trevor standing; 01 = Syfa standing; 02 = Grant standing; 03 = Alucard standing; | ''00 = Trevor standing; 01 = Syfa standing; 02 = Grant standing; 03 = Alucard standing; | ||
04 = Trevor duck; 05 = Syfa duck; 06 = Grant duck; 07 = Alucard duck; 08 = Bat | ''04 = Trevor duck; 05 = Syfa duck; 06 = Grant duck; 07 = Alucard duck; 08 = Bat | ||
$0084 Hearts | $0084 Hearts | ||
$0085 Trevor Subweapon | $0085 Trevor Subweapon | ||
00 = none; 01 = axe; 02 = boomerang; 03 = knife/book; 04 = holy water; 05 = fireball; | ''00 = none; 01 = axe; 02 = boomerang; 03 = knife/book; 04 = holy water; 05 = fireball; | ||
06 = freeze; 07 = orb; 08 = axe; 09 = boomerang; 0a = knife/book ;0b = clock | ''06 = freeze; 07 = orb; 08 = axe; 09 = boomerang; 0a = knife/book ;0b = clock | ||
$0086 Partner Subweapon | $0086 Partner Subweapon | ||
$0087 Trevor Subweapon Multiplier 00 = none; 01 = [II]; 02 = [III] | $0087 Trevor Subweapon Multiplier | ||
''00 = none; 01 = [II]; 02 = [III] | |||
$0088 Partner Subweapon Multiplier | $0088 Partner Subweapon Multiplier | ||
$0089 Vertical Scanline Target ''(HUD bottom in vertical rooms) | |||
$008B Conveyance | $008B Conveyance | ||
01 = Elevator/Frozen enemy; 02 = Scroll-locked right; 05 = Teeter-totter; | ''01 = Elevator/Frozen enemy; 02 = Scroll-locked right; 05 = Teeter-totter; | ||
06 = Cogwheel; 07 = Mud; 08 = Waterfall; 09 = Waterfall w/current; | ''06 = Cogwheel; 07 = Mud; 08 = Waterfall; 09 = Waterfall w/current; | ||
0a = Conveyor left; 0b = Conveyor right; 0d = Petrified; 0e = Auto-walk | ''0a = Conveyor left; 0b = Conveyor right; 0d = Petrified; 0e = Auto-walk | ||
$008C Whip Spark Timer | $008C Whip Spark Timer | ||
$008D Room Initialized | $008D Room Initialized | ||
$008E Trevor Weapon Level | $008E Trevor Weapon Level | ||
00 = short; 01 = medium; 02 = long | ''00 = short; 01 = medium; 02 = long | ||
$008F Partner Weapon Level | $008F Partner Weapon Level | ||
00 = one orb; 01 = two orbs; 03 = three orbs | ''00 = one orb; 01 = two orbs; 03 = three orbs | ||
$0090 Knockback Direction | $0090 Knockback Direction | ||
00 = left; 01 = right | ''00 = left; 01 = right | ||
$0091 Conveyor (see $008B) | $0091 Conveyor ''(see $008B) | ||
$0093 Cog Proximity | $0093 Cog Proximity | ||
00 = none; 01 = right OR below; 02 = right AND below | ''00 = none; 01 = right OR below; 02 = right AND below | ||
$0094 Cog ID | $0094 Cog ID | ||
$0095 Cogwheel Size | $0095 Cogwheel Size | ||
00 = small; 01 = large | ''00 = small; 01 = large | ||
$009C Subweapon Kill Count (affects multiplier drops) | $0096 Terrain Present | ||
$009D Variable Jump (for Grant) | $0098 #02 Spawner Data Address | ||
$009a #02 Terrain Data Address | |||
$009C Subweapon Kill Count ''(affects multiplier drops) | |||
$009D Variable Jump ''(for Grant) | |||
$009E Subweapon Iterator | $009E Subweapon Iterator | ||
$009F Previous Game State | $009F Upgrade Previous Game State | ||
$00A0 Recent Player Direction (copy of $009E) | $00A0 Recent Player Direction ''(copy of $009E) | ||
$00A1 Previous Player Direction (copy of $0062) | $00A1 Previous Player Direction ''(copy of $0062) | ||
$00A3 Game Step Counter (only increments while game not paused) | $00A3 Game Step Counter ''(only increments while game not paused) | ||
$00A4 Map Transition Checkpoint | |||
$00A5 Check Right Tile | $00A5 Check Right Tile | ||
$00A6 Default Drawing State Backup ''(used during partner swap) | |||
$00A7 #02 IRQ Latch Backup ''(used during partner swap) | |||
$00A9 IRQ Control Backup ''(used during partner swap) | |||
$00AA Partner Swap Previous Game State | |||
$00AB Stopwatch Active | $00AB Stopwatch Active | ||
$00AC Stopwatch Timer | $00AC Stopwatch Timer | ||
$00AD Invincibility Potion Timer | $00AD Invincibility Potion Timer | ||
$00AE Alucard Bat Timer (drains 1 heart when decreased to 0) | $00AE Alucard Bat Timer ''(drains 1 heart when decreased to 0) | ||
$00AF Landing Delay (prevents walking between elevators) | $00AF Landing Delay ''(prevents walking between elevators) | ||
$00B0 Load Doppelganger Sprites (forces CHR updates) | $00B0 Load Doppelganger Sprites ''(forces CHR updates) | ||
$00B1 Current Instance (backup for X register) | $00B1 Current Instance ''(backup for X register) | ||
$00B8 Current Platform (ID of elevator or frozen enemy) | $00B2 Rosary Flash Timer | ||
$00B9 Crash Timer (stuns Player after falling too far) | $00B3 Bridge Out | ||
$00BA Boss | $00B6 Tile Assembly Count Vertical ''(only for vertical rooms)'' | ||
$00BF Faint Pause (pauses game when killed or time runs out) | $00B7 Power Up ''(used for weapon upgrade)'' | ||
$00C8 Horizontal Scroll Lock (used by crumbling bridge) | $00B8 Current Platform ''(ID of elevator or frozen enemy) | ||
$00B9 Crash Timer ''(stuns Player after falling too far) | |||
$00BA Boss Special Hitbox ''(bitmasked) | |||
$00BB Boss Melee Hitbox | |||
''01-03 = Doppelganger whip; 04 = Doppelganger staff; | |||
''05 = Death's Skull; 06 = Moat Dragon head; | |||
$00BC Boss Hitbox Phase ''(redundant with Doppelganger) | |||
$00BD Bone Dragon King HP | |||
$00BE Bone Dragon King Misc. Ticker | |||
$00BF Faint Pause ''(pauses game when killed or time runs out) | |||
$00C0 Flood Halted | |||
$00C1 Boss Object | |||
$00C2 Boss Second Phase | |||
$00C3 Boss Spawner | |||
$00C4 #02 Boss Frozen Bitmask ''(used in conjunction with $0790, also prevents ally swap) | |||
$00C6 Autowalk Data Pointer ''(ref. $00:9140 for autowalk behavior) | |||
''00 = Clocktower/Default; 04 = Forest; 08 = Alucard Caves; | |||
''0C = Ghost Ship; 10 = Mountain Pass; 14 = Castle Keep | |||
$00C7 Thaw Timer ''(for frozen water)'' | |||
$00C8 Horizontal Scroll Lock ''(used by crumbling bridge) | |||
$00CA Flood Height | $00CA Flood Height | ||
$00CE Weapon Kill Count (affects item drops) | $00CB Flood Height Subpixel | ||
$00CF Previous Conveyance (backup of $0088) | $00CC #02 Boss Stunned Bitmask ''(similar to $00C4, but stops animation and allows ally swap) | ||
$00D0 Vertical Ceiling (lowest y-coordinate in vertical room) | $00CE Weapon Kill Count ''(affects item drops) | ||
$00EF Audio | $00CF Previous Conveyance ''(backup of $0088) | ||
$00F0 #04 Candle Status (32-bit mask) | $00D0 Vertical Ceiling ''(lowest y-coordinate in vertical room) | ||
$00D2 Cogwheel ID Copy | |||
$00D3 Grant Corner Y-Coordinate | |||
$00D4 Cogwheel ID | |||
$00E0 #02 Audio Current Note Address | |||
$00E2 #02 Audio Redirect Address | |||
Audio Data Temporary Variable | |||
$00E4 #02 Audio Data 16-bit Variable | |||
$00E6 #02 Audio Track Base Address | |||
$00E8 #02 Audio Track Address | |||
$00EA Audio Channels to Load | |||
$00EB Audio Routine PROM Bank | |||
$00EC #02 Audio Current Period ''(i.e., pitch) | |||
$00EE Audio Current Channel | |||
$00EF Audio Track ID | |||
$00F0 #04 Candle Status ''(32-bit mask) | |||
$00F4 #04 Breakable Wall Status | $00F4 #04 Breakable Wall Status | ||
00 = unused/unbroken; ff = broken | ''00 = unused/unbroken; ff = broken | ||
$00F8 #02 Previous Controller Buttons Pressed | $00F8 #02 Previous Controller Buttons Pressed | ||
$00FA #02 Previous Controller Buttons Held | $00FA #02 Previous Controller Buttons Held | ||
$00FC #02 PPU Scroll | $00FC #02 PPU Scroll | ||
$00FE PPU Mask (for hue shifts and greyscale) | $00FE PPU Mask ''(for hue shifts and greyscale) | ||
$00FF PPU Control | $00FF PPU Control | ||
'''''Audio channels:''' (grouped by 3, 5, or 7)'' | |||
''00 = BGM Square 1; 021 = BGM Square 2; 02 = BGM Triangle;'' | |||
''03 = SFX Square 1; 04 = SFX Square 2;'' | |||
''05 = Drums (DCM & Noise); 06 = Noise'' | |||
$0100 #07 Audio Channel Note Duration | |||
$0107 #07 Audio Channel Song ID | |||
$010E #07 Audio Channel Next Note Duration | |||
$0115 #07 Audio Channel Behavior | |||
''bit 0 = SFX (ignore ritenuto); bits 1-2 = init/decay/sustain/release;'' | |||
''bit 3 = Al segno loop; bit 5 = coda loop; bit 6 = ignore envelope;'' | |||
$011C #07 Audio Channel Loop Count | |||
$0123 #07 Audio Channel Note Address Low Byte | |||
$012A #07 Audio Channel Note Address High Byte | |||
$0131 #07 Audio Channel Al Segno Address Low Byte | |||
$0138 #07 Audio Channel Al Segno Address High Byte | |||
$013F #07 Audio Channel Coda Address Low Byte | |||
$0146 #07 Audio Channel Coda Address High Byte | |||
$014D #07 Audio Channel Previous Period High Byte | |||
$0152 Audio Global Dampening ''(lowers volume for all channels)'' | |||
$0154 #07 Audio Channel Volume | |||
$0159 Audio Global Fade Timer ''(decreases $017C after 2b steps)'' | |||
$015B #07 Audio Channel Next Control Value / Channel Dampening Placeholder | |||
$0160 Audio Global Fade Delay | |||
$0162 #07 Audio Channel Default Duty Cycle | |||
$0167 Audio Global Mute for Pause | |||
$0169 #05 Audio Channel Dampening ''(lowers volume for specific channel)'' | |||
$016E #05 Audio Channel Attributes | |||
''bit 4 = use waveform; bit 5 = alternate duty; bit 7 = disabled'' '''needs more info''' | |||
$0173 #05 Audio Channel Pitch Bend Amount | |||
$0178 #05 Audio Channel Period Low Byte Backup ''(useless?) | |||
$017D #03 Audio Channel Octave (''raises octave by 5-n)'' | |||
$0180 #03 Audio Channel Note Offset | |||
''(adds signed value to note ID to look up period)'' | |||
$0183 #03 Audio Channel Period Low | |||
$0186 #03 Audio Channel Period High | |||
$0189 #03 Audio Channel Volume Envelope | |||
''(if bit 7 set, fade out instead based on bits 0-3)'' | |||
$018C Audio SFX Register Offset | |||
$018D Audio Global Ritenuto Delay ''(counts up to $018E)'' | |||
$018E Audio Global Ritenuto Cutoff ''(frames until $018F set)'' | |||
$018F Audio Global Ritenuto ''(prolongs BGM note duration when set)'' | |||
$0190 #02 Audio SFX Square Sweep | |||
$0192 Audio Current DPCM | |||
$0193 Audio Triangle Staccato Timer | |||
$0194 Audio Triangle Linear Counter ''(only used with $193)'' | |||
$0195 #07 Audio Channel PROM Bank | |||
$019C Audio SFX Square 1 Sweep ''(write to $4001)'' | |||
$0200 #100 OAM Data | $0200 #100 OAM Data | ||
$0300 #a0 Tile Data | $0300 #a0 Tile Data | ||
$03C0 #03 Audio Channel Volume Envelope Duration | |||
$03C3 #03 Audio Channel Volume Envelope Position | |||
$03C6 #03 Audio Channel Volume Envelope Loop Count | |||
$03C9 #03 Audio Channel Volume Envelope Loop Point | |||
$03CC #03 Audio Channel Fadeout Point ''(fades out when equal to $100,X)'' | |||
$03CF #03 Audio Channel Volume Envelope | |||
''(bits 0-3 = value; $03CC = duration*value >> 4)'' | |||
$03D2 #03 Audio Channel Next Fade Duration | |||
$03D5 #03 Audio Channel Fade Duration | |||
$03D8 #03 Audio Channel Alternate Duty Cycle | |||
$03DB #03 Audio Channel Next Pitchbend Duration | |||
$03DE #03 Audio Channel Pitchbend Duration | |||
$03E1 #03 Audio Channel Sweep Rate | |||
$0400 #1c Sprite Frame Index | $0400 #1c Sprite Frame Index | ||
$041C #1c Y-Coordinate | $041C #1c Y-Coordinate | ||
$0438 #1c X-Coordinate | $0438 #1c X-Coordinate | ||
$0454 #1c | $0454 #1c Sprite Attributes ''(palette & background priority) | ||
$0470 #1c Attributes | $0470 #1c Attributes | ||
01 = destroyed; 02 = frozen; 04 = unknown; 08 = flicker; | ''01 = destroyed; 02 = frozen; 04 = unknown; 08 = flicker; | ||
10 = illusory; 20 = inanimate; 40 = moving; 80 = invisible | ''10 = illusory; 20 = inanimate; 40 = moving; 80 = invisible | ||
$048C #1c Animation Batch (even numbers) | $048C #1c Animation Batch ''(even numbers) | ||
00-06 = Player; 08-12 = NPCs; 14 = Epilogue; 16-1C = Doppelganger | ''00-06 = Player; 08-12 = NPCs; 14 = Epilogue; 16-1C = Doppelganger | ||
$04A8 #1C Sprite Mirrored | $04A8 #1C Sprite Mirrored | ||
$04C4 #17 X-Coordinate Subpixel | $04C4 #17 X-Coordinate Subpixel | ||
$04DB #17 Y-Coordinate Subpixel | $04DB #17 Y-Coordinate Subpixel | ||
$04F2 #17 Horizontal Speed | $04F2 #17 Horizontal Speed | ||
$0505 Partner Swap Ghosting Amount | |||
$0509 #17 Horizontal Speed Subpixel | $0509 #17 Horizontal Speed Subpixel | ||
$051C Partner Swap Ghosting Amount Fractional | |||
$0520 #17 Vertical Speed | $0520 #17 Vertical Speed | ||
$0537 #17 Vertical Speed Subpixel | $0537 #17 Vertical Speed Subpixel | ||
| Line 165: | Line 305: | ||
$0579 #03 Subweapon State | $0579 #03 Subweapon State | ||
$057C #17 Animation Timer | $057C #17 Animation Timer | ||
$0593 #17 Sprite Frame (used to calculate $0400,X) | $0593 #17 Sprite Frame ''(used to calculate $0400,X) | ||
$05AA #17 Sprite Index | $05AA #17 Sprite Index | ||
$05C1 Moving Down | $05C1 Moving Down | ||
$05C2 #12 NPC State | $05C2 #12 NPC State | ||
$05D4 Player Stunned State | $05D4 Player Stunned State | ||
Partner Swap X-coordinate | |||
$05D5 #03 Subweapon Throw Delay | $05D5 #03 Subweapon Throw Delay | ||
$05D8 Player Jump State | $05D8 Player Jump State | ||
00-1D = Trevor/Syfa/Alucard; 1E-39 = Grant | ''00-1D = Trevor/Syfa/Alucard; 1E-39 = Grant | ||
$05D9 #0c Boss Use | $05D9 #0c Boss Use | ||
$05E5 #06 Candle Drop | $05E5 #06 Candle Drop | ||
83 = Axe; 84 = Cross; 85 = Dagger; 86 = Holy Water; 87 = Stopwatch; | ''83 = Axe; 84 = Cross; 85 = Dagger; 86 = Holy Water; 87 = Stopwatch; | ||
88 = Syfa Fire; 89 = Syfa Ice; 8a = Syfa Water; 8b = Grant Dagger; | ''88 = Syfa Fire; 89 = Syfa Ice; 8a = Syfa Water; 8b = Grant Dagger; | ||
8c Grant Axe; 8d-8f = Upgrades (8f removed); 90 = Wall Meat; | ''8c Grant Axe; 8d-8f = Upgrades (8f removed); 90 = Wall Meat; | ||
'' 91 = Invincibility Potion; 92 = Rosary; 93-9b = Coins; 9c = 1UP; | |||
'' 9d = Big Heart; 9e = Small Heart; 9f-a0 = Multipliers | |||
$05EB Stair Stun Timer | $05EB Stair Stun Timer | ||
Partner Swap Ghosting Speed Fractional | |||
$05EF Stair Direction | $05EF Stair Direction | ||
Grant Jump State Fraction (functions like speed variables) | Grant Jump State Fraction ''(functions like speed variables) | ||
$05F0 #12 AI Class (determines behavior) | $05F0 #12 AI Class ''(determines behavior) | ||
$0602 Stair Stun (decreases $05EB) | $0602 Stair Stun ''(decreases $05EB) | ||
$0606 Grant Gravity Subpixel (increases $05EF for Grant) | Freezing Rivers | ||
$0607 #12 State Timer (time between state changes for most NPCs) | Turning Into Bat | ||
Partner Swap Ghosting Speed | |||
$0606 Grant Gravity Subpixel ''(increases $05EF for Grant) | |||
$0607 #12 State Timer ''(time between state changes for most NPCs) | |||
Sinusoid Center Axis | Sinusoid Center Axis | ||
$0619 | $0619 Partner Swap Y-Coordinate | ||
$061A #03 Subweapon Damage | $061A #03 Subweapon Damage and Multikill Count | ||
$061D Stair Timer (time to climb one step) | $061D Stair Timer ''(time to climb one step) | ||
Grant Gravity (increases $05D8 for Grant) | Grant Gravity ''(increases $05D8 for Grant) | ||
$061E #12 Miscellaneous Ticker (usually timer or counter for NPCs) | $061E #12 Miscellaneous Ticker ''(usually timer or counter for NPCs) | ||
$0630 Weapon Damage | $0630 Weapon Damage | ||
$0631 #03 Subweapon Deflection (copy of $0658,X on Cross hit) | $0631 #03 Subweapon Deflection ''(copy of $0658,X on Cross hit) | ||
$0634 #17 Miscellaneous Use (used by a couple NPCs) | $0634 #17 Miscellaneous Use ''(used by a couple NPCs) | ||
$0646 #12 Spawner Index | $0646 #12 Spawner Index | ||
$0658 #0d NPC Damage | $0658 #0d NPC Damage | ||
$0664 #06 Candle Active | $0664 #06 Candle Active | ||
$066A #12 Applied Effect (copy of $061A,X on subweapon hit) | $066A #12 Applied Effect ''(copy of $061A,X on subweapon hit) | ||
$067B #12 NPC Hitpoints | $067B #12 NPC Hitpoints | ||
$068E #12 Weapons Impact | $068E #12 Weapons Impact | ||
01 = weapon; 02 = subweapon 1; 04 = subweapon 2; 08 = subweapon 3 | ''01 = weapon; 02 = subweapon 1; 04 = subweapon 2; 08 = subweapon 3 | ||
$ | $06A0 #03 Audio Channel Pitch Envelope Loop Start | ||
$ | $06A3 #03 Audio Channel Pitch Envelope ID | ||
$06A6 #03 Audio Channel Pitch Envelope Position | |||
$06A9 #03 Audio Channel Pitch Envelope Loop Count | |||
$06AC #03 Audio Channel Sustain State ''(80 = disabled)'' | |||
$06AF #03 Audio Channel Sustain Position ''(from 0 to 3)'' | |||
$06B2 #03 Audio Channel Sustain Dampen | |||
$06B5 #04 Audio BGM Square 1 Sustain Period Low Bytes | |||
$06B9 #04 Audio BGM Square 2 Sustain Period Low Bytes | |||
$06BD #04 Audio BGM Square 1 Sustain Period High Bytes | |||
$06C1 #04 Audio BGM Square 2 Sustain Period High Bytes | |||
$06C8 Boss Scream Time ''(stops DPCM at f0)'' | |||
$06C9 Music Paused | |||
$06E0 #90 Collision Map | $06E0 #90 Collision Map | ||
''00 = empty; 01 = mud; 02 = convey right; 03 = convey left; | |||
''04 = fragile; 05 = ceiling spike; 06 = solid; 07 = floor spike; | |||
''08 = ice; 0c-0f = cracking'' | |||
$0770 #08 CHR5 Solid Definitions | $0770 #08 CHR5 Solid Definitions | ||
Byte 0 = empty; Byte 1 = mud; Byte 2 = convey right; Byte 3 = convey left; | ''Byte 0 = empty; Byte 1 = mud; Byte 2 = convey right; Byte 3 = convey left;'' | ||
Byte 4 = | ''Byte 4 = fragile; Byte 5 = ceiling spike; Byte 6 = solid; Byte 7 = floor spike'' | ||
$0778 #08 CHR6 Solid Definitions | $0778 #08 CHR6 Solid Definitions | ||
$0780 Background Animation Frame | $0780 Background Animation Frame | ||
Entry Selector Column | |||
Map Clipping | |||
00 = To Grant; 01 = To Syfa; 02 = From Alucard | ''00 = To Grant; 01 = To Syfa; 02 = From Alucard | ||
$0781 Background Animation Timer | $0781 Background Animation Timer | ||
Entry Selector Row | |||
Map Fade-out Value | |||
$0782 | $0782 #40 Fog Parallax Positions | ||
''32 rows of parallax with 2 bytes per row:'' | |||
''Byte 0 = subpixel offset; Byte 1 = pixel offset'' | |||
Previous Selector Column | |||
Map Timer | |||
Epilogue Partner | |||
Sypha's Frozen Tile Column | |||
$0783 Previous Selector Row | $0783 Previous Selector Row | ||
Map Horizontal Speed Subpixel | |||
Epilogue State | |||
Sypha's Frozen Tile Row | |||
$0784 Name Cursor Position | $0784 Name Cursor Position | ||
Map Horizontal Speed | |||
Castle Shake Direction | |||
Leftmost Frozen Tile Column | |||
$0785 Map Vertical Speed Subpixel | $0785 Map Vertical Speed Subpixel | ||
Epilogue Text Page | |||
Leftmost Frozen Tile Row | |||
$0786 Password Icon | $0786 Password Icon | ||
Map Vertical Speed | |||
Rightmost Frozen Tile Column | |||
$0787 Previous Password Icon | $0787 Previous Password Icon | ||
Map Scroll Timer | |||
Rightmost Frozen Tile Row | |||
$0788 #02 Password Decryption Dump | $0788 #02 Password Decryption Dump | ||
Map X-coordinate Subpixel | |||
Epilogue Scroll Timer | |||
Water Freeze Counter | |||
$0789 Map Y-coordinate Subpixel | $0789 Map Y-coordinate Subpixel | ||
Frozen Water Room Type | |||
$078A Epilogue Timer | $078A Epilogue Timer | ||
Map Path PPU Scroll | |||
$078B Password Errors (used for debugging) | $078B Map Path PPU Control | ||
Password Errors ''(used for debugging) | |||
$078C #02 Map Path PPU Address | $078C #02 Map Path PPU Address | ||
Update Selector | |||
$0790 #10 Entered Password | $0790 #10 Entered Password | ||
00 = empty; 01 = whip; 02 = cross; 03 = heart | ''00 = empty; 01 = whip; 02 = cross; 03 = heart | ||
#10 Boss Delay Timer ''(maintains current behavior while decreasing) | |||
00 = full; 01 = short west; 02 = bottom east; | Map Screen Platform | ||
03 = top west; 04 = middle west; 05 = bottom west | ''00 = full; 01 = short west; 02 = bottom east; | ||
''03 = top west; 04 = middle west; 05 = bottom west | |||
$07A0 #0a Generated Password | $07A0 #0a Generated Password | ||
$07B1 #02 Stacked Breakable Wall | $07B1 #02 Stacked Breakable Wall | ||
$07B3 #02 Lower Block Broken | $07B3 #02 Lower Block Broken | ||
$07B5 #02 Upper Block Broken | $07B5 #02 Upper Block Broken | ||
$07B7 #02 Wall ID (points to $00F4,X) | $07B7 #02 Wall ID ''(points to $00F4,X) | ||
$07C2 #06 Spawner Type | $07C2 #06 Spawner Type | ||
$07C8 #06 Spawner State | $07C8 #06 Spawner State | ||
| Line 259: | Line 430: | ||
$07E0 #06 Spawner Offscreen | $07E0 #06 Spawner Offscreen | ||
$07E6 #06 Spawner NPC Object | $07E6 #06 Spawner NPC Object | ||
$07EC #06 Bone Dragon King Frames (two ribs per byte) | $07EC #06 Bone Dragon King Frames ''(two ribs per byte) | ||
Cyclops Lightning State | |||
Bone Dragon Cycle | Bone Dragon Cycle | ||
Giant Bat Leader | Giant Bat Leader | ||
Dracula Phase | Dracula Phase | ||
00 = Dracula; 01 = demon; 02 = Pazuzu | ''00 = Dracula; 01 = demon; 02 = Pazuzu | ||
$07ED | $07ED Stage Clear State | ||
Bone Dragon Mirrored | Bone Dragon Mirrored | ||
Collapsing Bridge Length | Collapsing Bridge Length | ||
| Line 272: | Line 443: | ||
Death Scythe Count | Death Scythe Count | ||
$07EF Bone Dragon Attacking | $07EF Bone Dragon Attacking | ||
$07F3 Boss | $07F3 Boss Battle State | ||
00 = boss fight; 01 = boss defeat; 02 = crystal drop; | ''00 = boss fight; 01 = boss defeat; 02 = crystal drop; | ||
03 = battle over; 80 = boss waiting | ''03 = battle over; 80 = boss waiting | ||
Victory Delay (timer after battle over) | Victory Delay (timer after battle over) | ||
$07F6 Hard Mode | $07F6 Hard Mode | ||
| Line 283: | Line 454: | ||
Address Size Description | Address Size Description | ||
-------- ---- ----------- | -------- ---- ----------- | ||
$0017 Repeat Counter | |||
Story Reel Border State | |||
''00 = no border; 01 = draw border; 03 = write to $0303 | |||
$0018 System State | $0018 System State | ||
''00 = Title; 02 = New Game; 03 = In-game Transition; 04 = In-Game;'' | ''00 = Title; 02 = New Game; 03 = In-game Transition; 04 = In-Game;'' | ||
| Line 290: | Line 464: | ||
$0019 System Substate | $0019 System Substate | ||
$001B System Step Counter | $001B System Step Counter | ||
$001C Radio Mode ''(halts most code except music) | |||
$001D Blackout Delay | $001D Blackout Delay | ||
$001E X Register Backup | |||
$001F Pausing Disabled ''(always 00?)'' | |||
$0020 Randomizer | $0020 Randomizer | ||
$0021 PPU Bank (write to $B003) | $0021 PPU Bank ''(write to $B003) | ||
$0022 OAM Batch | |||
$0023 Current PROM Bank | |||
$0024 Previous PROM Bank | |||
$0025 PROM Bank Backup ''(used by some functions)'' | |||
$0026 Bank Changed ''(for debugging probably)'' | |||
$0028 #02 Controller Buttons Pressed | $0028 #02 Controller Buttons Pressed | ||
''01 = right; 02 = left; 04 = down; 08 = up;'' | ''01 = right; 02 = left; 04 = down; 08 = up;'' | ||
''10 = start; 20 = select; 40 = B; 80 = A'' | ''10 = start; 20 = select; 40 = B; 80 = A'' | ||
$002A #02 Controller Buttons Held | $002A #02 Controller Buttons Held | ||
$002C Game State | $002C Game State ''(set $0068 to 00 before changing)'' | ||
$002D User Paused (toggled by Start button) | ''00 = initialize room; 01 = initialize nametables; 02 = load horizontal room; | ||
''03 = horizontal gameplay; 04 = load vertical room; 05 = vertical gameplay; | |||
''06 = stair transition start; 07 = stair transition fade; 08 = door transition; | |||
''09 = initialize fog; 0a = fog parallax; 0b = horizontal partner swap; | |||
''0c = vertical partner swap; 0d/0e = <CUT CONTENT>; 0f = detect automatic stairs; | |||
''10 = automatic stair transition; 11 = tally score; 12 = <UNUSED>; | |||
''13 = flee Aquarius; 14 = initialize flooding; 15 = load flood room; | |||
''16 = flood room gameplay; 17 = map transition; 18 = autowalk to door; | |||
''19 = powering up; 1a = freeze water; 1b = thaw ice; 1c = Bone King escape; | |||
''1d = Aquarius ruptured; 1e = initialize map transition; 1f = map transition exit | |||
$002D User Paused ''(toggled by Start button) | |||
$002E Boss Defeated | $002E Boss Defeated | ||
$0030 Checkpoint (used for Password Entry) | $002F Entry End ''(valid in Name screen, garbage in Pass screen) | ||
$0030 Checkpoint ''(used for Password Entry) | |||
$0031 Grant Defeated | $0031 Grant Defeated | ||
$0032 #02 System Effect Timer | $0032 #02 System Effect Timer | ||
| Line 310: | Line 503: | ||
$0040 IRQ Control | $0040 IRQ Control | ||
$0041 #02 IRQ Latch | $0041 #02 IRQ Latch | ||
$0043 Default Drawing State (write to $006A) | $0043 Default Drawing State ''(write to $006A) | ||
$0044 #03 Score | $0044 #03 Score | ||
$0047 Player Object ''(change this to not always be Trevor) | |||
$0048 Partner | $0048 Partner | ||
''00 = Trevor; 01 = Syfa; 02 = Grant; 03 = Alucard; ff = None'' | ''00 = Trevor; 01 = Syfa; 02 = Grant; 03 = Alucard; ff = None'' | ||
| Line 318: | Line 512: | ||
''40 = full'' | ''40 = full'' | ||
$004B Boss Health | $004B Boss Health | ||
$004C Score Target (for extra life) | $004C Score Target ''(for extra life) | ||
$004D #02 Tile Assembly Room Address | |||
$004F #02 Tile Assembly Left Address | |||
$0051 #02 Tile Assembly Right Address | |||
$0053 #02 View Position | $0053 #02 View Position | ||
$0055 View Subpixel Position | $0055 View Subpixel Position | ||
$0056 Left Spawn Area | $0056 Left Spawn Area | ||
$0057 Right Spawn Area | $0057 Right Spawn Area | ||
$0058 Tile Assembly Count Left | |||
$0059 Tile Assembly Count Right | |||
$005A #02 Tile Assembly Pointer | $005A #02 Tile Assembly Pointer | ||
$005C #02 Pallet Map Pointer | $005C #02 Pallet Map Pointer | ||
| Line 336: | Line 535: | ||
''83 = scroll down; 84 = collapse up; 85 = collapse down'' | ''83 = scroll down; 84 = collapse up; 85 = collapse down'' | ||
$0066 #02 Stair Map Address | $0066 #02 Stair Map Address | ||
$0068 | $0068 Menu selections | ||
$0069 Current Instance (saves X register) | Door State | ||
''00 = unopened; 01 = load next room; 02 = scroll in next room; | |||
''03 = unlatch door; 04 = open door; 05 = walk in; 06 = close door; | |||
''07 = latch door; 08 = scroll out old room; 09 = end transition | |||
$0069 Current Instance ''(saves X register) | |||
$006A Drawing State | $006A Drawing State | ||
$006B View Speed | $006B View Speed | ||
| Line 346: | Line 549: | ||
$0070 Previous Room Orientation | $0070 Previous Room Orientation | ||
$0071 Music Loaded | $0071 Music Loaded | ||
$0072 Transition Nametable (nametable to use after door closes) | $0072 Transition Nametable ''(nametable to use after door closes) | ||
$0073 Horizontal Spawner Block | $0073 Horizontal Spawner Block | ||
$0074 First Spawner Block | $0074 First Spawner Block | ||
| Line 353: | Line 556: | ||
$0077 Vertical Spawner Previous (?) | $0077 Vertical Spawner Previous (?) | ||
$0078 Spawner Count | $0078 Spawner Count | ||
$0079 Vertical Partner Y-Coordinate ''(used for partner swap in vertical rooms) | |||
$007A Room Type | $007A Room Type | ||
''10 = Stormclouds; 20 = Autowalk; 30 = River; 40 = Clockwork;'' | ''10 = Stormclouds; 20 = Autowalk; 30 = River; 40 = Clockwork;'' | ||
| Line 358: | Line 562: | ||
''Note: lower 4 bits alter behavior'' | ''Note: lower 4 bits alter behavior'' | ||
$007B #02 Time | $007B #02 Time | ||
$007D Wounded Timer (invincibility frames) | $007D Wounded Timer ''(invincibility frames) | ||
$007E Damage Received | $007E Damage Received/Effect On Player | ||
$007F PC Height | $007F PC Height | ||
''00 = Trevor standing; 01 = Syfa standing; 02 = Grant standing; 03 = Alucard standing;'' | ''00 = Trevor standing; 01 = Syfa standing; 02 = Grant standing; 03 = Alucard standing;'' | ||
| Line 383: | Line 587: | ||
$008D Knockback Direction | $008D Knockback Direction | ||
''00 = left; 01 = right'' | ''00 = left; 01 = right'' | ||
$008E Conveyor (see $0088) | $008E Conveyor ''(see $0088) | ||
$0090 Cog Proximity | $0090 Cog Proximity | ||
''00 = none; 01 = right OR below; 02 = right AND below'' | ''00 = none; 01 = right OR below; 02 = right AND below'' | ||
| Line 389: | Line 593: | ||
$0092 Cogwheel Size | $0092 Cogwheel Size | ||
''00 = small; 01 = large'' | ''00 = small; 01 = large'' | ||
$0099 Subweapon Kill Count (affects multiplier drops) | $0093 Terrain Present | ||
$009A Variable Jump (for Grant) | $0095 #02 Spawner Data Address | ||
$0097 #02 Terrain Data Address | |||
$0099 Subweapon Kill Count ''(affects multiplier drops) | |||
$009A Variable Jump ''(for Grant) | |||
$009B Subweapon Iterator | $009B Subweapon Iterator | ||
$009C Previous Game State | $009C Upgrade Previous Game State | ||
$009D Recent Player Direction (copy of $009E) | $009D Recent Player Direction ''(copy of $009E) | ||
$009E Previous Player Direction (copy of $0062) | $009E Previous Player Direction ''(copy of $0062) | ||
$00A0 Game Step Counter (only increments while game not paused) | $00A0 Game Step Counter ''(only increments while game not paused) | ||
$00A1 Map Transition Checkpoint | |||
$00A2 Check Right Tile | $00A2 Check Right Tile | ||
$00A3 Default Drawing State Backup ''(used during partner swap) | |||
$00A4 #02 IRQ Latch Backup ''(used during partner swap) | |||
$00A6 IRQ Control Backup ''(used during partner swap) | |||
$00A7 Partner Swap Previous Game State | |||
$00A8 Stopwatch Active | $00A8 Stopwatch Active | ||
$00A9 Stopwatch Timer | $00A9 Stopwatch Timer | ||
$00AA Invincibility Potion Timer | $00AA Invincibility Potion Timer | ||
$00AB Alucard Bat Timer (drains 1 heart when decreased to 0) | $00AB Alucard Bat Timer ''(drains 1 heart when decreased to 0) | ||
$00AC Landing Delay (prevents walking between elevators) | $00AC Landing Delay ''(prevents walking between elevators) | ||
$00AD Load Doppelganger Sprites (forces CHR updates) | $00AD Load Doppelganger Sprites ''(forces CHR updates) | ||
$00AE Current Instance (backup for X register) | $00AE Current Instance ''(backup for X register) | ||
$00B5 Current Platform (ID of elevator or frozen enemy) | $00AF Rosary Flash Timer | ||
$00B6 Crash Timer (stuns Player after falling too far) | $00B0 Bridge Out | ||
$00B7 Boss | $00B3 Tile Assembly Count Vertical ''(only for vertical rooms)'' | ||
$00BC Faint Pause (pauses game when killed or time runs out) | $00B4 Power Up ''(used for weapon upgrade)'' | ||
$00C5 Horizontal Scroll Lock (used by crumbling bridge) | $00B5 Current Platform ''(ID of elevator or frozen enemy) | ||
$00B6 Crash Timer ''(stuns Player after falling too far) | |||
$00B7 Boss Special Hitbox ''(bitmasked) | |||
$00B8 Boss Melee Hitbox | |||
''01-03 = Doppelganger whip; 04 = Doppelganger staff; | |||
''05 = Death's Skull; 06 = Moat Dragon head; | |||
$00B9 Boss Hitbox Phase ''(redundant with Doppelganger) | |||
$00BA Bone Dragon King HP | |||
$00BB Bone Dragon King Misc. Ticker | |||
$00BC Faint Pause ''(pauses game when killed or time runs out) | |||
$00BD Flood Paused ''(only set when Bone Dragon flees?) | |||
$00BE Boss Object | |||
$00BF Boss Second Phase ''(for Death, set then cleared for Bone Dragon) | |||
$00C0 Boss Spawner ID | |||
$00C1 #02 Boss Appearance Bitmask ''(used in conjunction with $0790, prevents ally swap) | |||
$00C3 Autowalk Data Pointer ''(ref. $00:9140 for autowalk behavior) | |||
''00 = Clocktower/Default; 04 = Forest; 08 = Alucard Caves; | |||
''0C = Ghost Ship; 10 = Mountain Pass; 14 = Castle Keep | |||
$00C4 Thaw Timer ''(for frozen waters)'' | |||
$00C5 Horizontal Scroll Lock ''(used by crumbling bridge) | |||
$00C7 Flood Height | $00C7 Flood Height | ||
$00CB Weapon Kill Count (affects item drops) | $00C8 Flood Height Subpixel | ||
$00CC Previous Conveyance (backup of $0088) | $00C9 #02 Boss Stun Bitmask ''(similar to $00C1, stops animation, allows ally swap) | ||
$00CD Vertical Ceiling (lowest y-coordinate in vertical room) | $00CB Weapon Kill Count ''(affects item drops) | ||
$00CC Previous Conveyance ''(backup of $0088) | |||
$00CD Vertical Ceiling ''(lowest y-coordinate in vertical room) | |||
$00CF Cogwheel ID Copy | |||
$00D0 Grant Corner Y-Coordinate | |||
$00D1 Cogwheel ID | |||
$00E0 #02 Audio Current Note Address | $00E0 #02 Audio Current Note Address | ||
$00E2 #02 Audio Redirect Address | $00E2 #02 Audio Redirect Address | ||
Audio Data Temporary Variable | |||
$00E4 #02 Audio Data 16-bit Variable | $00E4 #02 Audio Data 16-bit Variable | ||
$00E6 #02 Audio | $00E6 #02 Audio Track Base Address | ||
$00E8 #02 Audio | $00E8 #02 Audio Track Address | ||
$00EA Audio Channels to Load | $00EA Audio Channels to Load | ||
$00EB Audio Routine PROM Bank | $00EB Audio Routine PROM Bank | ||
$00EC #02 Audio Current Period (i.e., pitch) | $00EC #02 Audio Current Period ''(i.e., pitch) | ||
$00EE Audio Current Channel | $00EE Audio Current Channel | ||
$00EF Audio | $00EF Audio Track ID | ||
$00F0 #04 Candle Status (32-bit mask) | $00F0 #04 Candle Status ''(32-bit mask) | ||
$00F4 #04 Breakable Wall Status | $00F4 #04 Breakable Wall Status | ||
''00 = unused/unbroken; ff = broken'' | ''00 = unused/unbroken; ff = broken'' | ||
| Line 430: | Line 666: | ||
$00FA #02 Previous Controller Buttons Held | $00FA #02 Previous Controller Buttons Held | ||
$00FC #02 PPU Scroll | $00FC #02 PPU Scroll | ||
$00FE PPU Mask (for hue shifts and greyscale) | $00FE PPU Mask ''(for hue shifts and greyscale) | ||
$00FF PPU Control | $00FF PPU Control | ||
'''''Audio channels:''' (grouped by 5, 7, or 9)'' | '''''Audio channels:''' (grouped by 5, 7, or 9)'' | ||
| Line 440: | Line 676: | ||
$0112 #09 Audio Channel Next Note Duration | $0112 #09 Audio Channel Next Note Duration | ||
$011B #09 Audio Channel Behavior | $011B #09 Audio Channel Behavior | ||
''bit 0 = SFX (ignore | ''bit 0 = SFX (ignore ritenuto); bits 1-2 = init/decay/sustain/release;'' | ||
''bit 6 = ignore envelope; | ''bit 3 = Al segno loop; bit 5 = coda loop; bit 6 = ignore envelope;'' | ||
$0124 #09 Audio Channel Loop Count | $0124 #09 Audio Channel Loop Count | ||
$012D #09 Audio Channel Note Address Low Byte | $012D #09 Audio Channel Note Address Low Byte | ||
$0136 #09 Audio Channel Note Address High Byte | $0136 #09 Audio Channel Note Address High Byte | ||
$013F #09 Audio Channel | $013F #09 Audio Channel Al Segno Address Low Byte | ||
$0148 #09 Audio Channel | $0148 #09 Audio Channel Al Segno Address High Byte | ||
$0151 #09 Audio Channel | $0151 #09 Audio Channel Coda Address Low Byte | ||
$015A #09 Audio Channel | $015A #09 Audio Channel Coda Address High Byte | ||
$0163 #09 Audio Channel Previous Period High Byte | $0163 #09 Audio Channel Previous Period High Byte | ||
$016A Audio Global Dampening ''(lowers volume for all channels)'' | |||
$016C #09 Audio Channel Volume | $016C #09 Audio Channel Volume | ||
$0173 Audio Global Fade Timer ''(decreases $017C after 2b steps)'' | |||
$0175 #09 Audio Channel Next | $0175 #09 Audio Channel Next Control Value / Channel Dampening Placeholder | ||
$017C Audio Global Fade Delay | |||
$017E #09 Audio Channel Default Duty Cycle | $017E #09 Audio Channel Default Duty Cycle | ||
$0185 Audio Global Mute for Pause | |||
$0187 #07 Audio Channel Dampening ''(lowers volume for specific channel)'' | $0187 #07 Audio Channel Dampening ''(lowers volume for specific channel)'' | ||
$018E #07 Audio Channel Attributes | $018E #07 Audio Channel Attributes | ||
''bit 4 = use waveform; bit 5 = alternate duty; bit 7 = disabled'' '''needs more info''' | ''bit 4 = use waveform; bit 5 = alternate duty; bit 7 = disabled'' '''needs more info''' | ||
$0195 #07 Audio Channel Pitch Bend Amount | $0195 #07 Audio Channel Pitch Bend Amount | ||
$019C | $019C #02 Audio SFX Square Sweep | ||
$019E Audio DPCM ID | $019E Audio DPCM ID | ||
$019F #02 Audio Square Period Low Byte ''(write to $4002/$4006)'' | $019F #02 Audio Square Period Low Byte ''(write to $4002/$4006)'' | ||
$01A3 #05 Audio Channel | $01A3 #05 Audio Channel Octave ''(raises octave by 5-n)'' | ||
$01A8 #05 Audio Channel Note Offset | $01A8 #05 Audio Channel Note Offset | ||
''(adds signed value to note ID to look up period)'' | ''(adds signed value to note ID to look up period)'' | ||
$01AD #05 Audio Channel Period Low | $01AD #05 Audio Channel Period Low | ||
$01B2 #05 Audio Channel Period High | $01B2 #05 Audio Channel Period High | ||
$01B7 #05 Audio Channel Volume Envelope | $01B7 #05 Audio Channel Volume Envelope | ||
''(if bit 7 set, fade out instead based on bits 0-3)'' | ''(if bit 7 set, fade out instead based on bits 0-3)'' | ||
| Line 475: | Line 711: | ||
$01BE Audio Global Ritenuto Cutoff ''(frames until $01BF set)'' | $01BE Audio Global Ritenuto Cutoff ''(frames until $01BF set)'' | ||
$01BF Audio Global Ritenuto ''(prolongs BGM note duration when set)'' | $01BF Audio Global Ritenuto ''(prolongs BGM note duration when set)'' | ||
$0200 #100 OAM Data | $0200 #100 OAM Data | ||
$0300 #a0 Tile Data | $0300 #a0 Tile Data | ||
$03C0 #05 Audio Channel Volume Duration | $03C0 #05 Audio Channel Volume Envelope Duration | ||
$03C5 #05 Audio Channel | $03C5 #05 Audio Channel Volume Envelope Position | ||
$03D4 #05 Audio Channel | $03CA #05 Audio Channel Volume Envelope Loop Count | ||
$03CF #05 Audio Channel Volume Envelope Loop Point | |||
$03D4 #05 Audio Channel Fadeout Point ''(fades out when equal to $100,X)'' | |||
$03D9 #05 Audio Channel Volume Envelope | $03D9 #05 Audio Channel Volume Envelope | ||
''(bits 0-3 = value; $03D4 = duration*value >> 4)'' | ''(bits 0-3 = value; $03D4 = duration*value >> 4)'' | ||
$03DE #05 Audio Channel Next Fade | $03DE #05 Audio Channel Next Fade Duration | ||
$03E3 #05 Audio Channel Fade | $03E3 #05 Audio Channel Fade Duration | ||
$03E8 #05 Audio Channel Alternate Duty Cycle | $03E8 #05 Audio Channel Alternate Duty Cycle | ||
$03ED #05 Audio Channel Next | $03ED #05 Audio Channel Next Pitchbend Duration | ||
$03F2 #05 Audio Channel | $03F2 #05 Audio Channel Pitchbend Duration | ||
$03F7 #05 Audio Channel Sweep Rate | $03F7 #05 Audio Channel Sweep Rate | ||
$0400 #1c Sprite Frame Index | $0400 #1c Sprite Frame Index | ||
$041C #1c Y-Coordinate | $041C #1c Y-Coordinate | ||
$0438 #1c X-Coordinate | $0438 #1c X-Coordinate | ||
$0454 #1c | $0454 #1c Sprite Attributes ''(palette & background priority) | ||
$0470 #1c Attributes | $0470 #1c Attributes | ||
''01 = destroyed; 02 = frozen; 04 = unknown; 08 = flicker;'' | ''01 = destroyed; 02 = frozen; 04 = unknown; 08 = flicker;'' | ||
| Line 502: | Line 739: | ||
$04DB #17 Y-Coordinate Subpixel | $04DB #17 Y-Coordinate Subpixel | ||
$04F2 #17 Horizontal Speed | $04F2 #17 Horizontal Speed | ||
$0505 Partner Swap Ghosting Amount | |||
$0509 #17 Horizontal Speed Subpixel | $0509 #17 Horizontal Speed Subpixel | ||
$051C Partner Swap Ghosting Amount Fractional | |||
$0520 #17 Vertical Speed | $0520 #17 Vertical Speed | ||
$0537 #17 Vertical Speed Subpixel | $0537 #17 Vertical Speed Subpixel | ||
| Line 511: | Line 750: | ||
$0579 #03 Subweapon State | $0579 #03 Subweapon State | ||
$057C #17 Animation Timer | $057C #17 Animation Timer | ||
$0593 #17 Sprite Frame (used to calculate $0400,X) | $0593 #17 Sprite Frame ''(used to calculate $0400,X) | ||
$05AA #17 Sprite Index | $05AA #17 Sprite Index | ||
$05C1 Moving Down | $05C1 Moving Down | ||
$05C2 #12 NPC State | $05C2 #12 NPC State | ||
$05D4 Player Stunned State | $05D4 Player Stunned State | ||
Partner Swap X-Coordinate | |||
$05D5 #03 Subweapon Throw Delay | $05D5 #03 Subweapon Throw Delay | ||
$05D8 Player Jump State | $05D8 Player Jump State | ||
| Line 527: | Line 767: | ||
''9d = Big Heart; 9e = Small Heart; 9f-a0 = Multipliers'' | ''9d = Big Heart; 9e = Small Heart; 9f-a0 = Multipliers'' | ||
$05EB Stair Stun Timer | $05EB Stair Stun Timer | ||
Partner Swap Ghosting Speed Fractional | |||
$05EF Stair Direction | $05EF Stair Direction | ||
Grant Jump State Fraction (functions like speed variables) | Grant Jump State Fraction ''(functions like speed variables) | ||
$05F0 #12 AI Class (determines behavior) | $05F0 #12 AI Class ''(determines behavior) | ||
$0602 Stair Stun (decreases $05EB) | $0602 Stair Stun ''(decreases $05EB) | ||
$0606 Grant Gravity Subpixel (increases $05EF for Grant) | Freezing Rivers | ||
$0607 #12 State Timer (time between state changes for most NPCs) | Turning Into Bat | ||
Partner Swap Ghosting Speed | |||
$0606 Grant Gravity Subpixel ''(increases $05EF for Grant) | |||
$0607 #12 State Timer ''(time between state changes for most NPCs) | |||
Sinusoid Center Axis | Sinusoid Center Axis | ||
$0619 | $0619 Partner Swap Y-Coordinate | ||
$061A #03 Subweapon Damage | $061A #03 Subweapon Damage and Multikill Count | ||
$061D Stair Timer (time to climb one step) | $061D Stair Timer ''(time to climb one step) | ||
Grant Gravity (increases $05D8 for Grant) | Grant Gravity ''(increases $05D8 for Grant) | ||
$061E #12 Miscellaneous Ticker (usually timer or counter for NPCs) | $061E #12 Miscellaneous Ticker ''(usually timer or counter for NPCs) | ||
$0630 Weapon Damage | $0630 Weapon Damage | ||
$0631 #03 Subweapon Deflection (copy of $0658,X on Cross hit) | $0631 #03 Subweapon Deflection ''(copy of $0658,X on Cross hit) | ||
$0634 #17 Miscellaneous Use (used by a couple NPCs) | $0634 #17 Miscellaneous Use ''(used by a couple NPCs) | ||
$0646 #12 Spawner Index | $0646 #12 Spawner Index | ||
$0658 #0d NPC Damage | $0658 #0d NPC Damage | ||
$0664 #06 Candle Active | $0664 #06 Candle Active | ||
$066A #12 Applied Effect (copy of $061A,X on subweapon hit) | $066A #12 Applied Effect ''(copy of $061A,X on subweapon hit) | ||
$067B #12 NPC Hitpoints | $067B #12 NPC Hitpoints | ||
$068E #12 Weapons Impact | $068E #12 Weapons Impact | ||
''01 = weapon; 02 = subweapon 1; 04 = subweapon 2; 08 = subweapon 3'' | ''01 = weapon; 02 = subweapon 1; 04 = subweapon 2; 08 = subweapon 3'' | ||
$06A0 #05 Audio Channel Pitch Envelope Loop | $06A0 #05 Audio Channel Pitch Envelope Loop Start | ||
$06A5 #05 Audio Channel Pitch Envelope | $06A5 #05 Audio Channel Pitch Envelope ID | ||
$06AA #05 Audio Channel Pitch Envelope Position | $06AA #05 Audio Channel Pitch Envelope Position | ||
$06AF #05 Audio Channel Pitch Envelope Loop Count | $06AF #05 Audio Channel Pitch Envelope Loop Count | ||
$06B4 #05 Audio Channel | $06B4 #05 Audio Channel Sustain State | ||
$06B9 #05 Audio Channel | $06B9 #05 Audio Channel Sustain Position ''(from 0 to 3)'' | ||
$06C3 #04 Audio BGM Square 1 | $06BE #05 Audio Channel Sustain Dampen | ||
$06C7 #04 Audio BGM Square 2 | $06C3 #04 Audio BGM Square 1 Sustain Period Low Bytes | ||
$06CB #04 Audio BGM Square 1 | $06C7 #04 Audio BGM Square 2 Sustain Period Low Bytes | ||
$06CF #04 Audio BGM Square 2 | $06CB #04 Audio BGM Square 1 Sustain Period High Bytes | ||
$06CF #04 Audio BGM Square 2 Sustain Period High Bytes | |||
$06D3 #09 Audio Channel PROM Bank | $06D3 #09 Audio Channel PROM Bank | ||
$06DC Music Paused | $06DC Music Paused | ||
$06DD Boss Scream | $06DD Boss Scream Duration ''stops DPCM playback'' | ||
$06E0 #90 Collision Map | $06E0 #90 Collision Map | ||
''00 = empty; 01 = mud; 02 = convey right; 03 = convey left; | |||
''04 = fragile; 05 = ceiling spike; 06 = solid; 07 = floor spike; | |||
''08 = ice; 0c-0f = cracking'' | |||
$0770 #08 CHR5 Solid Definitions | $0770 #08 CHR5 Solid Definitions | ||
''Byte 0 = empty; Byte 1 = mud; Byte 2 = convey right; Byte 3 = convey left;'' | ''Byte 0 = empty; Byte 1 = mud; Byte 2 = convey right; Byte 3 = convey left;'' | ||
''Byte 4 = | ''Byte 4 = fragile; Byte 5 = ceiling spike; Byte 6 = solid; Byte 7 = floor spike'' | ||
$0778 #08 CHR6 Solid Definitions | $0778 #08 CHR6 Solid Definitions | ||
$0780 Entry Selector Column | $0780 Entry Selector Column | ||
Background Animation Frame | |||
Map Clipping | |||
''00 = To Grant; 01 = To Syfa; 02 = From Alucard'' | ''00 = To Grant; 01 = To Syfa; 02 = From Alucard'' | ||
$0781 Background Animation Timer | $0781 Background Animation Timer | ||
Entry Selector Row | |||
Map Fade-out Value | |||
$0782 | $0782 #40 Fog Parallax Positions | ||
''32 rows of parallax with 2 bytes per row:'' | |||
''Byte 0 = subpixel offset; Byte 1 = pixel offset'' | |||
Previous Selector Column | |||
Map Timer | |||
Epilogue Partner | |||
Sypha's Frozen Tile Column | |||
$0783 Previous Selector Row | $0783 Previous Selector Row | ||
Map Horizontal Speed Subpixel | |||
Epilogue State | |||
Sypha's Frozen Tile Row | |||
Death Skull IRQ Latch | |||
$0784 Name Cursor Position | $0784 Name Cursor Position | ||
Map Horizontal Speed | |||
Castle Shake Direction | |||
$0785 | Leftmost Frozen Tile Column | ||
Death Skull Floor IRQ Latch ''(always 86) | |||
$0785 #02 Death Skull PPU Address | |||
Map Vertical Speed Subpixel | |||
Epilogue Text Page | |||
Leftmost Frozen Tile Row | |||
$0786 Password Icon | $0786 Password Icon | ||
Map Vertical Speed | |||
Rightmost Frozen Tile Column | |||
$0787 Previous Password Icon | $0787 Previous Password Icon | ||
Map Scroll Timer | |||
Rightmost Frozen Tile Row | |||
Death Skull Background Position | |||
$0788 #02 Password Decryption Dump | $0788 #02 Password Decryption Dump | ||
Map X-coordinate Subpixel | |||
Epilogue Scroll Timer | |||
Water Freeze Counter | |||
$0789 Map Y-coordinate Subpixel | $0789 Map Y-coordinate Subpixel | ||
Frozen Water Room Type | |||
$078A Epilogue Timer | $078A Epilogue Timer | ||
Map Path PPU Scroll | |||
$078B Password Errors (used for debugging) | Death Skull IRQ Latch Copy | ||
$078B Map Path PPU Control | |||
Password Errors ''(used for debugging) | |||
Death Skull Floor IRQ Latch | |||
$078C #02 Map Path PPU Address | $078C #02 Map Path PPU Address | ||
$ | #02 Death Skull PPU Address | ||
Update Selector | |||
$078E Death Skull Background Position | |||
$078F #02 Death Skull Copy of $0788 and $0789 ''(unused) | |||
$0790 #10 Entered Password | $0790 #10 Entered Password | ||
''00 = empty; 01 = whip; 02 = cross; 03 = heart'' | ''00 = empty; 01 = whip; 02 = cross; 03 = heart'' | ||
#10 Boss Delay Timer ''(delays primary boss logic) | |||
Map Screen Platform | |||
''00 = full; 01 = short west; 02 = bottom east;'' | ''00 = full; 01 = short west; 02 = bottom east;'' | ||
''03 = top west; 04 = middle west; 05 = bottom west'' | ''03 = top west; 04 = middle west; 05 = bottom west'' | ||
| Line 614: | Line 877: | ||
$07B3 #02 Lower Block Broken | $07B3 #02 Lower Block Broken | ||
$07B5 #02 Upper Block Broken | $07B5 #02 Upper Block Broken | ||
$07B7 #02 Wall ID (points to $00F4,X) | $07B7 #02 Wall ID ''(points to $00F4,X) | ||
$07C2 #06 Spawner Type | $07C2 #06 Spawner Type | ||
$07C8 #06 Spawner State | $07C8 #06 Spawner State | ||
| Line 622: | Line 885: | ||
$07E0 #06 Spawner Offscreen | $07E0 #06 Spawner Offscreen | ||
$07E6 #06 Spawner NPC Object | $07E6 #06 Spawner NPC Object | ||
$07EC #06 Bone Dragon King Frames (two ribs per byte) | $07EC #06 Bone Dragon King Frames ''(two ribs per byte) | ||
Various Boss Uses | |||
''specific uses by address: | |||
$07EC Cyclops Lightning State | |||
Giant Bat Leader | |||
Alucard Bat Leader | |||
$ | Medusa Leader | ||
Bone Dragon Mirrored | Death Aggro | ||
''bit 3 = goto next phase; bit 6 = skull form; bit 7 = attacking | |||
Doppelganger Character ''(same as $0634, for subweapons only) | |||
Dracula Phase | |||
''00 = Dracula; 01 = demon; 02 = Pazuzu'' | |||
$07ED Giant Bat State | |||
Alucard Bat State | |||
Medusa Snakes Merged (bitmasked) | |||
Death Movement | |||
''bit 1-2 = horizontal speed; bit 3-4 = vertical speed; left if bit 3 set | |||
Creature Shake Amount | |||
Moat Dragon #1 Withdraw Speed ''(ff = normal; fe = slain) | |||
Doppelganger Keypress ''(only 01 or 02 used for jumping) | |||
''01 = right; 02 = left; 03 = down; 04 = up; 05 = B; 06 = Up | |||
$07EE Giant Bat Swarm State | |||
Alucard Bat Swarm State | |||
Death Scythe Limit | |||
Wisp Defeats ''(00 = none; 01 = Mummy; 02 = Cyclops; 03 = Baphomet) | |||
Moat Dragon #1 Height | |||
Doppelganger Status When Hit | |||
$07EF Moat Dragon #2 Withdraw Speed | |||
''ff = normal; fe = slain | |||
Alucard Form | |||
''00 = humanoid; 01 = wisp; 02 = bat swarm; | |||
''03 = bat gathering; 04 = smoke | |||
Death Scythe Count ''(for spawn positioning) | |||
Doppelganger Recovered ''(impedes AI for one frame) | |||
$07F0 Moat Dragon #2 Height | |||
Alucard Transform Delay | |||
$07F1 Mummy Boss Tally | |||
Giant Bat Stunned | |||
Alucard Bat Converge ''(arguably useless) | |||
Death Transitioning | |||
$07EC Bone Dragon Cycle | |||
Map Effects Timer | |||
$07ED Bone Dragon Mirrored | |||
Stage Clear State ''(XORed by #80 if new partner declined) | |||
Collapsing Bridge Length | Collapsing Bridge Length | ||
$07EE Bone Dragon Fireball Timer | $07EE Bone Dragon Fireball Timer | ||
$07EF Bone Dragon Attacking | $07EF Bone Dragon Attacking | ||
$07F3 Boss | Story Text | ||
$07F0 Story Line | |||
$07F1 #02 Story Text Address | |||
Meeting Dialogue Timer | |||
$07F3 Boss Battle State | |||
''00 = boss fight; 01 = boss defeat; 02 = crystal drop;'' | ''00 = boss fight; 01 = boss defeat; 02 = crystal drop;'' | ||
''03 = battle over; 80 = boss waiting'' | ''03 = battle over; 80 = boss waiting'' | ||
Stage Clear Delay ''(timer after battle over) | |||
$07F6 Hard Mode | $07F6 Hard Mode | ||
$07F8 #08 Player Name | $07F8 #08 Player Name | ||
{{Internal Data|game=Castlevania III}} | {{Internal Data|game=Castlevania III}} | ||
Latest revision as of 01:20, 24 January 2024
The following article is a RAM map for Castlevania III: Dracula's Curse.
Address Size Description
-------- ---- -----------
$0017 Repeat Counter
$0018 System State
00 = Title; 02 = New Game; 03 = In-game Transition; 04 = In-Game;
05 = Game Over Transition; 06 = Game Over; 07 = Stage Select Debug;
08 = Map Screen; 09 = Prayer Scene; 0a = Name Entry; 0b = Password Entry;
0c = Epilogue; 0d = Credit Roll; 0e = Respawn; 0f = Sound Test Debug
$0019 System Substate
$001A System Step Counter
$001B Radio Mode (halts most code except music)
$001C Blackout Delay
$001D X Register Backup
$001E Pausing Disabled (always 00?)
$001F Randomizer
$0020 OAM Batch
$0021 Current PROM Bank
$0022 Previous PROM Bank
$0023 PROM Bank Backup (used by some functions)
$0024 Bank Changed (for debugging probably)
$0025 Nametable Mapping
$0026 #02 Controller Buttons Pressed
01 = right; 02 = left; 04 = down; 08 = up;
10 = start; 20 = select; 40 = B; 80 = A
$0028 #02 Controller Buttons Held
$002A Game State (set $006B to 00 before changing)
00 = initialize room; 01 = initialize nametables; 02 = load horizontal room;
03 = horizontal gameplay; 04 = load vertical room; 05 = vertical gameplay;
06 = stair transition start; 07 = stair transition fade; 08 = door transition;
09 = initialize fog; 0a = fog parallax; 0b = horizontal partner swap;
0c = vertical partner swap; 0d/0e = <CUT CONTENT>; 0f = detect automatic stairs;
10 = automatic stair transition; 11 = tally score; 12 = <UNUSED>;
13 = flee Aquarius; 14 = initialize flooding; 15 = load flood room;
16 = flood room gameplay; 17 = map transition; 18 = autowalk to door;
19 = powering up; 1a = freeze water; 1b = thaw ice; 1c = Bone King escape;
1d = Aquarius ruptured; 1e = initialize map transition; 1f = map transition exit
$002B User Paused (toggled by Start button)
$002C Boss Defeated
$002D Entry End (valid in Name screen, garbage in Pass screen)
$002E Checkpoint
$002F Grant Defeated
$0030 #02 System Effect Timer
$0032 Stage
$0033 Block
$0034 Room
$0035 Lives
$0036 #03 Score
$0039 Main Character (change this to not always be Trevor)
$003A Partner
00 = Trevor; 01 = Syfa; 02 = Grant; 03 = Alucard; ff = None
$003B Partner Active
$003C Player's Health
40 = full
$003D Boss Health
$003E Score Target (for extra life)
$003F Default Drawing State (write to $006D)
$0040 Scanline IRQ
$0041 Scanline Target
$0042 Default Vertical Scanline Target (write to $0089)
$0043 Scanline Next Target
$0044 #02 Draw State Address
$0046 #08 CHR Banks
$004E Hard Mode CHR Bank (overwrites $0049)
$0050 #02 Tile Assembly Starting Address
$0052 #02 Tile Assembly Left Address
$0054 #02 Tile Assembly Right Address
$0056 #02 View Position (little endian)
$0058 View Subpixel Position
$0059 Left Spawn Area
$005A Right Spawn Area
$005B Tile Assembly Count Left
$005C Tile Assembly Count Right
$005D #02 Tile Assembly Pointer
$005F #02 Pallet Map Pointer
$0061 #02 Nametable Write Address
$0063 Tile Assembly ID
$0064 Transition Timer
$0065 Scroll Direction
00 = left; 01 = right; 02 = unchanged
$0066 View Refreshed Position
$0067 Update View
$0068 Room Orientation
00 = horizontal; 80 or 81 = vertical; 82 = scroll up;
83 = scroll down; 84 = collapse up; 85 = collapse down
$0069 #02 Stair Map Address
$006B Menu selections
Door State
00 = unopened; 01 = load next room; 02 = scroll in next room;
03 = unlatch door; 04 = open door; 05 = walk in; 06 = close door;
07 = latch door; 08 = scroll out old room; 09 = end transition
$006C Current Instance (saves X register)
$006D Drawing State
$006E View Speed
$006F #02 PPU Scroll
$0071 Room Size
$0072 CHR Write Mode
00 or 03 = all CHR banks; 01 = status bar banks; 02 = clear NPC banks
$0073 Previous Room Orientation
$0074 Music Loaded
$0075 Transition Nametable (nametable to use after door closes)
$0076 Horizontal Spawner Block
$0077 First Spawner Block
$0078 Boss Scroll Lock
$0079 Vertical Spawner Block
$007A Vertical Spawner Previous (?)
$007B Spawner Count
$007C Vertical Partner Y-Coordinate (used for partner swap in vertical rooms)
$007D Room Type
10 = Stormclouds; 20 = Autowalk; 30 = River; 40 = Clockwork;
50 and 60 = Watery Grave; 70 = Flood Zone; 80 = Collapsing Bridge
Note: lower 4 bits alter behavior
$007E #02 Time
$0080 Wounded Timer (invincibility frames)
$0081 Damage Received/Effect on Player
$0082 PC Height
00 = Trevor standing; 01 = Syfa standing; 02 = Grant standing; 03 = Alucard standing;
04 = Trevor duck; 05 = Syfa duck; 06 = Grant duck; 07 = Alucard duck; 08 = Bat
$0084 Hearts
$0085 Trevor Subweapon
00 = none; 01 = axe; 02 = boomerang; 03 = knife/book; 04 = holy water; 05 = fireball;
06 = freeze; 07 = orb; 08 = axe; 09 = boomerang; 0a = knife/book ;0b = clock
$0086 Partner Subweapon
$0087 Trevor Subweapon Multiplier
00 = none; 01 = [II]; 02 = [III]
$0088 Partner Subweapon Multiplier
$0089 Vertical Scanline Target (HUD bottom in vertical rooms)
$008B Conveyance
01 = Elevator/Frozen enemy; 02 = Scroll-locked right; 05 = Teeter-totter;
06 = Cogwheel; 07 = Mud; 08 = Waterfall; 09 = Waterfall w/current;
0a = Conveyor left; 0b = Conveyor right; 0d = Petrified; 0e = Auto-walk
$008C Whip Spark Timer
$008D Room Initialized
$008E Trevor Weapon Level
00 = short; 01 = medium; 02 = long
$008F Partner Weapon Level
00 = one orb; 01 = two orbs; 03 = three orbs
$0090 Knockback Direction
00 = left; 01 = right
$0091 Conveyor (see $008B)
$0093 Cog Proximity
00 = none; 01 = right OR below; 02 = right AND below
$0094 Cog ID
$0095 Cogwheel Size
00 = small; 01 = large
$0096 Terrain Present
$0098 #02 Spawner Data Address
$009a #02 Terrain Data Address
$009C Subweapon Kill Count (affects multiplier drops)
$009D Variable Jump (for Grant)
$009E Subweapon Iterator
$009F Upgrade Previous Game State
$00A0 Recent Player Direction (copy of $009E)
$00A1 Previous Player Direction (copy of $0062)
$00A3 Game Step Counter (only increments while game not paused)
$00A4 Map Transition Checkpoint
$00A5 Check Right Tile
$00A6 Default Drawing State Backup (used during partner swap)
$00A7 #02 IRQ Latch Backup (used during partner swap)
$00A9 IRQ Control Backup (used during partner swap)
$00AA Partner Swap Previous Game State
$00AB Stopwatch Active
$00AC Stopwatch Timer
$00AD Invincibility Potion Timer
$00AE Alucard Bat Timer (drains 1 heart when decreased to 0)
$00AF Landing Delay (prevents walking between elevators)
$00B0 Load Doppelganger Sprites (forces CHR updates)
$00B1 Current Instance (backup for X register)
$00B2 Rosary Flash Timer
$00B3 Bridge Out
$00B6 Tile Assembly Count Vertical (only for vertical rooms)
$00B7 Power Up (used for weapon upgrade)
$00B8 Current Platform (ID of elevator or frozen enemy)
$00B9 Crash Timer (stuns Player after falling too far)
$00BA Boss Special Hitbox (bitmasked)
$00BB Boss Melee Hitbox
01-03 = Doppelganger whip; 04 = Doppelganger staff;
05 = Death's Skull; 06 = Moat Dragon head;
$00BC Boss Hitbox Phase (redundant with Doppelganger)
$00BD Bone Dragon King HP
$00BE Bone Dragon King Misc. Ticker
$00BF Faint Pause (pauses game when killed or time runs out)
$00C0 Flood Halted
$00C1 Boss Object
$00C2 Boss Second Phase
$00C3 Boss Spawner
$00C4 #02 Boss Frozen Bitmask (used in conjunction with $0790, also prevents ally swap)
$00C6 Autowalk Data Pointer (ref. $00:9140 for autowalk behavior)
00 = Clocktower/Default; 04 = Forest; 08 = Alucard Caves;
0C = Ghost Ship; 10 = Mountain Pass; 14 = Castle Keep
$00C7 Thaw Timer (for frozen water)
$00C8 Horizontal Scroll Lock (used by crumbling bridge)
$00CA Flood Height
$00CB Flood Height Subpixel
$00CC #02 Boss Stunned Bitmask (similar to $00C4, but stops animation and allows ally swap)
$00CE Weapon Kill Count (affects item drops)
$00CF Previous Conveyance (backup of $0088)
$00D0 Vertical Ceiling (lowest y-coordinate in vertical room)
$00D2 Cogwheel ID Copy
$00D3 Grant Corner Y-Coordinate
$00D4 Cogwheel ID
$00E0 #02 Audio Current Note Address
$00E2 #02 Audio Redirect Address
Audio Data Temporary Variable
$00E4 #02 Audio Data 16-bit Variable
$00E6 #02 Audio Track Base Address
$00E8 #02 Audio Track Address
$00EA Audio Channels to Load
$00EB Audio Routine PROM Bank
$00EC #02 Audio Current Period (i.e., pitch)
$00EE Audio Current Channel
$00EF Audio Track ID
$00F0 #04 Candle Status (32-bit mask)
$00F4 #04 Breakable Wall Status
00 = unused/unbroken; ff = broken
$00F8 #02 Previous Controller Buttons Pressed
$00FA #02 Previous Controller Buttons Held
$00FC #02 PPU Scroll
$00FE PPU Mask (for hue shifts and greyscale)
$00FF PPU Control
Audio channels: (grouped by 3, 5, or 7)
00 = BGM Square 1; 021 = BGM Square 2; 02 = BGM Triangle;
03 = SFX Square 1; 04 = SFX Square 2;
05 = Drums (DCM & Noise); 06 = Noise
$0100 #07 Audio Channel Note Duration
$0107 #07 Audio Channel Song ID
$010E #07 Audio Channel Next Note Duration
$0115 #07 Audio Channel Behavior
bit 0 = SFX (ignore ritenuto); bits 1-2 = init/decay/sustain/release;
bit 3 = Al segno loop; bit 5 = coda loop; bit 6 = ignore envelope;
$011C #07 Audio Channel Loop Count
$0123 #07 Audio Channel Note Address Low Byte
$012A #07 Audio Channel Note Address High Byte
$0131 #07 Audio Channel Al Segno Address Low Byte
$0138 #07 Audio Channel Al Segno Address High Byte
$013F #07 Audio Channel Coda Address Low Byte
$0146 #07 Audio Channel Coda Address High Byte
$014D #07 Audio Channel Previous Period High Byte
$0152 Audio Global Dampening (lowers volume for all channels)
$0154 #07 Audio Channel Volume
$0159 Audio Global Fade Timer (decreases $017C after 2b steps)
$015B #07 Audio Channel Next Control Value / Channel Dampening Placeholder
$0160 Audio Global Fade Delay
$0162 #07 Audio Channel Default Duty Cycle
$0167 Audio Global Mute for Pause
$0169 #05 Audio Channel Dampening (lowers volume for specific channel)
$016E #05 Audio Channel Attributes
bit 4 = use waveform; bit 5 = alternate duty; bit 7 = disabled needs more info
$0173 #05 Audio Channel Pitch Bend Amount
$0178 #05 Audio Channel Period Low Byte Backup (useless?)
$017D #03 Audio Channel Octave (raises octave by 5-n)
$0180 #03 Audio Channel Note Offset
(adds signed value to note ID to look up period)
$0183 #03 Audio Channel Period Low
$0186 #03 Audio Channel Period High
$0189 #03 Audio Channel Volume Envelope
(if bit 7 set, fade out instead based on bits 0-3)
$018C Audio SFX Register Offset
$018D Audio Global Ritenuto Delay (counts up to $018E)
$018E Audio Global Ritenuto Cutoff (frames until $018F set)
$018F Audio Global Ritenuto (prolongs BGM note duration when set)
$0190 #02 Audio SFX Square Sweep
$0192 Audio Current DPCM
$0193 Audio Triangle Staccato Timer
$0194 Audio Triangle Linear Counter (only used with $193)
$0195 #07 Audio Channel PROM Bank
$019C Audio SFX Square 1 Sweep (write to $4001)
$0200 #100 OAM Data
$0300 #a0 Tile Data
$03C0 #03 Audio Channel Volume Envelope Duration
$03C3 #03 Audio Channel Volume Envelope Position
$03C6 #03 Audio Channel Volume Envelope Loop Count
$03C9 #03 Audio Channel Volume Envelope Loop Point
$03CC #03 Audio Channel Fadeout Point (fades out when equal to $100,X)
$03CF #03 Audio Channel Volume Envelope
(bits 0-3 = value; $03CC = duration*value >> 4)
$03D2 #03 Audio Channel Next Fade Duration
$03D5 #03 Audio Channel Fade Duration
$03D8 #03 Audio Channel Alternate Duty Cycle
$03DB #03 Audio Channel Next Pitchbend Duration
$03DE #03 Audio Channel Pitchbend Duration
$03E1 #03 Audio Channel Sweep Rate
$0400 #1c Sprite Frame Index
$041C #1c Y-Coordinate
$0438 #1c X-Coordinate
$0454 #1c Sprite Attributes (palette & background priority)
$0470 #1c Attributes
01 = destroyed; 02 = frozen; 04 = unknown; 08 = flicker;
10 = illusory; 20 = inanimate; 40 = moving; 80 = invisible
$048C #1c Animation Batch (even numbers)
00-06 = Player; 08-12 = NPCs; 14 = Epilogue; 16-1C = Doppelganger
$04A8 #1C Sprite Mirrored
$04C4 #17 X-Coordinate Subpixel
$04DB #17 Y-Coordinate Subpixel
$04F2 #17 Horizontal Speed
$0505 Partner Swap Ghosting Amount
$0509 #17 Horizontal Speed Subpixel
$051C Partner Swap Ghosting Amount Fractional
$0520 #17 Vertical Speed
$0537 #17 Vertical Speed Subpixel
$054E #17 Object Index
$0565 Player State
$0566 #11 Stun Timer
$0578 Weapon State
$0579 #03 Subweapon State
$057C #17 Animation Timer
$0593 #17 Sprite Frame (used to calculate $0400,X)
$05AA #17 Sprite Index
$05C1 Moving Down
$05C2 #12 NPC State
$05D4 Player Stunned State
Partner Swap X-coordinate
$05D5 #03 Subweapon Throw Delay
$05D8 Player Jump State
00-1D = Trevor/Syfa/Alucard; 1E-39 = Grant
$05D9 #0c Boss Use
$05E5 #06 Candle Drop
83 = Axe; 84 = Cross; 85 = Dagger; 86 = Holy Water; 87 = Stopwatch;
88 = Syfa Fire; 89 = Syfa Ice; 8a = Syfa Water; 8b = Grant Dagger;
8c Grant Axe; 8d-8f = Upgrades (8f removed); 90 = Wall Meat;
91 = Invincibility Potion; 92 = Rosary; 93-9b = Coins; 9c = 1UP;
9d = Big Heart; 9e = Small Heart; 9f-a0 = Multipliers
$05EB Stair Stun Timer
Partner Swap Ghosting Speed Fractional
$05EF Stair Direction
Grant Jump State Fraction (functions like speed variables)
$05F0 #12 AI Class (determines behavior)
$0602 Stair Stun (decreases $05EB)
Freezing Rivers
Turning Into Bat
Partner Swap Ghosting Speed
$0606 Grant Gravity Subpixel (increases $05EF for Grant)
$0607 #12 State Timer (time between state changes for most NPCs)
Sinusoid Center Axis
$0619 Partner Swap Y-Coordinate
$061A #03 Subweapon Damage and Multikill Count
$061D Stair Timer (time to climb one step)
Grant Gravity (increases $05D8 for Grant)
$061E #12 Miscellaneous Ticker (usually timer or counter for NPCs)
$0630 Weapon Damage
$0631 #03 Subweapon Deflection (copy of $0658,X on Cross hit)
$0634 #17 Miscellaneous Use (used by a couple NPCs)
$0646 #12 Spawner Index
$0658 #0d NPC Damage
$0664 #06 Candle Active
$066A #12 Applied Effect (copy of $061A,X on subweapon hit)
$067B #12 NPC Hitpoints
$068E #12 Weapons Impact
01 = weapon; 02 = subweapon 1; 04 = subweapon 2; 08 = subweapon 3
$06A0 #03 Audio Channel Pitch Envelope Loop Start
$06A3 #03 Audio Channel Pitch Envelope ID
$06A6 #03 Audio Channel Pitch Envelope Position
$06A9 #03 Audio Channel Pitch Envelope Loop Count
$06AC #03 Audio Channel Sustain State (80 = disabled)
$06AF #03 Audio Channel Sustain Position (from 0 to 3)
$06B2 #03 Audio Channel Sustain Dampen
$06B5 #04 Audio BGM Square 1 Sustain Period Low Bytes
$06B9 #04 Audio BGM Square 2 Sustain Period Low Bytes
$06BD #04 Audio BGM Square 1 Sustain Period High Bytes
$06C1 #04 Audio BGM Square 2 Sustain Period High Bytes
$06C8 Boss Scream Time (stops DPCM at f0)
$06C9 Music Paused
$06E0 #90 Collision Map
00 = empty; 01 = mud; 02 = convey right; 03 = convey left;
04 = fragile; 05 = ceiling spike; 06 = solid; 07 = floor spike;
08 = ice; 0c-0f = cracking
$0770 #08 CHR5 Solid Definitions
Byte 0 = empty; Byte 1 = mud; Byte 2 = convey right; Byte 3 = convey left;
Byte 4 = fragile; Byte 5 = ceiling spike; Byte 6 = solid; Byte 7 = floor spike
$0778 #08 CHR6 Solid Definitions
$0780 Background Animation Frame
Entry Selector Column
Map Clipping
00 = To Grant; 01 = To Syfa; 02 = From Alucard
$0781 Background Animation Timer
Entry Selector Row
Map Fade-out Value
$0782 #40 Fog Parallax Positions
32 rows of parallax with 2 bytes per row:
Byte 0 = subpixel offset; Byte 1 = pixel offset
Previous Selector Column
Map Timer
Epilogue Partner
Sypha's Frozen Tile Column
$0783 Previous Selector Row
Map Horizontal Speed Subpixel
Epilogue State
Sypha's Frozen Tile Row
$0784 Name Cursor Position
Map Horizontal Speed
Castle Shake Direction
Leftmost Frozen Tile Column
$0785 Map Vertical Speed Subpixel
Epilogue Text Page
Leftmost Frozen Tile Row
$0786 Password Icon
Map Vertical Speed
Rightmost Frozen Tile Column
$0787 Previous Password Icon
Map Scroll Timer
Rightmost Frozen Tile Row
$0788 #02 Password Decryption Dump
Map X-coordinate Subpixel
Epilogue Scroll Timer
Water Freeze Counter
$0789 Map Y-coordinate Subpixel
Frozen Water Room Type
$078A Epilogue Timer
Map Path PPU Scroll
$078B Map Path PPU Control
Password Errors (used for debugging)
$078C #02 Map Path PPU Address
Update Selector
$0790 #10 Entered Password
00 = empty; 01 = whip; 02 = cross; 03 = heart
#10 Boss Delay Timer (maintains current behavior while decreasing)
Map Screen Platform
00 = full; 01 = short west; 02 = bottom east;
03 = top west; 04 = middle west; 05 = bottom west
$07A0 #0a Generated Password
$07B1 #02 Stacked Breakable Wall
$07B3 #02 Lower Block Broken
$07B5 #02 Upper Block Broken
$07B7 #02 Wall ID (points to $00F4,X)
$07C2 #06 Spawner Type
$07C8 #06 Spawner State
$07CE #06 Spawner Timer
$07D4 #06 Spawner Y-Coordinate
$07DA #06 Spawner x-Coordinate
$07E0 #06 Spawner Offscreen
$07E6 #06 Spawner NPC Object
$07EC #06 Bone Dragon King Frames (two ribs per byte)
Cyclops Lightning State
Bone Dragon Cycle
Giant Bat Leader
Dracula Phase
00 = Dracula; 01 = demon; 02 = Pazuzu
$07ED Stage Clear State
Bone Dragon Mirrored
Collapsing Bridge Length
Giant Bat State
$07EE Bone Dragon Fireball Timer
Death Scythe Count
$07EF Bone Dragon Attacking
$07F3 Boss Battle State
00 = boss fight; 01 = boss defeat; 02 = crystal drop;
03 = battle over; 80 = boss waiting
Victory Delay (timer after battle over)
$07F6 Hard Mode
$07F8 #08 Player Name
Address Size Description
-------- ---- -----------
$0017 Repeat Counter
Story Reel Border State
00 = no border; 01 = draw border; 03 = write to $0303
$0018 System State
00 = Title; 02 = New Game; 03 = In-game Transition; 04 = In-Game;
05 = Game Over Transition; 06 = Game Over; 07 = Stage Select Debug;
08 = Map Screen; 09 = Prayer Scene; 0a = Name Entry; 0b = Password Entry;
0c = Epilogue; 0d = Credit Roll; 0e = Respawn; 0f = Sound Test Debug
$0019 System Substate
$001B System Step Counter
$001C Radio Mode (halts most code except music)
$001D Blackout Delay
$001E X Register Backup
$001F Pausing Disabled (always 00?)
$0020 Randomizer
$0021 PPU Bank (write to $B003)
$0022 OAM Batch
$0023 Current PROM Bank
$0024 Previous PROM Bank
$0025 PROM Bank Backup (used by some functions)
$0026 Bank Changed (for debugging probably)
$0028 #02 Controller Buttons Pressed
01 = right; 02 = left; 04 = down; 08 = up;
10 = start; 20 = select; 40 = B; 80 = A
$002A #02 Controller Buttons Held
$002C Game State (set $0068 to 00 before changing)
00 = initialize room; 01 = initialize nametables; 02 = load horizontal room;
03 = horizontal gameplay; 04 = load vertical room; 05 = vertical gameplay;
06 = stair transition start; 07 = stair transition fade; 08 = door transition;
09 = initialize fog; 0a = fog parallax; 0b = horizontal partner swap;
0c = vertical partner swap; 0d/0e = <CUT CONTENT>; 0f = detect automatic stairs;
10 = automatic stair transition; 11 = tally score; 12 = <UNUSED>;
13 = flee Aquarius; 14 = initialize flooding; 15 = load flood room;
16 = flood room gameplay; 17 = map transition; 18 = autowalk to door;
19 = powering up; 1a = freeze water; 1b = thaw ice; 1c = Bone King escape;
1d = Aquarius ruptured; 1e = initialize map transition; 1f = map transition exit
$002D User Paused (toggled by Start button)
$002E Boss Defeated
$002F Entry End (valid in Name screen, garbage in Pass screen)
$0030 Checkpoint (used for Password Entry)
$0031 Grant Defeated
$0032 #02 System Effect Timer
$0034 Stage
$0035 Block
$0036 Room
$0037 Lives
$0038 #08 CHR Banks
$0040 IRQ Control
$0041 #02 IRQ Latch
$0043 Default Drawing State (write to $006A)
$0044 #03 Score
$0047 Player Object (change this to not always be Trevor)
$0048 Partner
00 = Trevor; 01 = Syfa; 02 = Grant; 03 = Alucard; ff = None
$0049 Partner Active
$004A Player's Health
40 = full
$004B Boss Health
$004C Score Target (for extra life)
$004D #02 Tile Assembly Room Address
$004F #02 Tile Assembly Left Address
$0051 #02 Tile Assembly Right Address
$0053 #02 View Position
$0055 View Subpixel Position
$0056 Left Spawn Area
$0057 Right Spawn Area
$0058 Tile Assembly Count Left
$0059 Tile Assembly Count Right
$005A #02 Tile Assembly Pointer
$005C #02 Pallet Map Pointer
$005E #02 Nametable Write Address
$0060 Tile Assembly ID
$0061 Transition Timer
$0062 Scroll Direction
00 = left; 01 = right; 02 = unchanged
$0063 View Refreshed Position
$0064 Update View
$0065 Room Orientation
00 = horizontal; 80 or 81 = vertical; 82 = scroll up;
83 = scroll down; 84 = collapse up; 85 = collapse down
$0066 #02 Stair Map Address
$0068 Menu selections
Door State
00 = unopened; 01 = load next room; 02 = scroll in next room;
03 = unlatch door; 04 = open door; 05 = walk in; 06 = close door;
07 = latch door; 08 = scroll out old room; 09 = end transition
$0069 Current Instance (saves X register)
$006A Drawing State
$006B View Speed
$006C #02 PPU Write Position
$006E Room Size
$006F CHR Write Mode
00 or 03 = all CHR banks; 01 = status bar banks; 02 = clear NPC banks
$0070 Previous Room Orientation
$0071 Music Loaded
$0072 Transition Nametable (nametable to use after door closes)
$0073 Horizontal Spawner Block
$0074 First Spawner Block
$0075 Boss Scroll Lock
$0076 Vertical Spawner Block
$0077 Vertical Spawner Previous (?)
$0078 Spawner Count
$0079 Vertical Partner Y-Coordinate (used for partner swap in vertical rooms)
$007A Room Type
10 = Stormclouds; 20 = Autowalk; 30 = River; 40 = Clockwork;
50 and 60 = Watery Grave; 70 = Flood Zone; 80 = Collapsing Bridge
Note: lower 4 bits alter behavior
$007B #02 Time
$007D Wounded Timer (invincibility frames)
$007E Damage Received/Effect On Player
$007F PC Height
00 = Trevor standing; 01 = Syfa standing; 02 = Grant standing; 03 = Alucard standing;
04 = Trevor duck; 05 = Syfa duck; 06 = Grant duck; 07 = Alucard duck; 08 = Bat
$0081 Hearts
$0082 Trevor Subweapon
00 = none; 01 = axe; 02 = boomerang; 03 = knife/book; 04 = holy water; 05 = fireball;
06 = freeze; 07 = orb; 08 = axe; 09 = boomerang; 0a = knife/book ;0b = clock
$0083 Partner Subweapon
$0084 Trevor Subweapon Multiplier
00 = none; 01 = [II]; 02 = [III]
$0085 Partner Subweapon Multiplier
$0088 Conveyance
01 = Elevator/Frozen enemy; 02 = Scroll-locked right; 05 = Teeter-totter;
06 = Cogwheel; 07 = Mud; 08 = Waterfall; 09 = Waterfall w/current;
0a = Conveyor left; 0b = Conveyor right; 0d = Petrified; 0e = Auto-walk
$0089 Whip Spark Timer
$008A Room Initialized
$008B Trevor Weapon Level
00 = short; 01 = medium; 02 = long
$008C Partner Weapon Level
00 = one orb; 01 = two orbs; 03 = three orbs
$008D Knockback Direction
00 = left; 01 = right
$008E Conveyor (see $0088)
$0090 Cog Proximity
00 = none; 01 = right OR below; 02 = right AND below
$0091 Cog ID
$0092 Cogwheel Size
00 = small; 01 = large
$0093 Terrain Present
$0095 #02 Spawner Data Address
$0097 #02 Terrain Data Address
$0099 Subweapon Kill Count (affects multiplier drops)
$009A Variable Jump (for Grant)
$009B Subweapon Iterator
$009C Upgrade Previous Game State
$009D Recent Player Direction (copy of $009E)
$009E Previous Player Direction (copy of $0062)
$00A0 Game Step Counter (only increments while game not paused)
$00A1 Map Transition Checkpoint
$00A2 Check Right Tile
$00A3 Default Drawing State Backup (used during partner swap)
$00A4 #02 IRQ Latch Backup (used during partner swap)
$00A6 IRQ Control Backup (used during partner swap)
$00A7 Partner Swap Previous Game State
$00A8 Stopwatch Active
$00A9 Stopwatch Timer
$00AA Invincibility Potion Timer
$00AB Alucard Bat Timer (drains 1 heart when decreased to 0)
$00AC Landing Delay (prevents walking between elevators)
$00AD Load Doppelganger Sprites (forces CHR updates)
$00AE Current Instance (backup for X register)
$00AF Rosary Flash Timer
$00B0 Bridge Out
$00B3 Tile Assembly Count Vertical (only for vertical rooms)
$00B4 Power Up (used for weapon upgrade)
$00B5 Current Platform (ID of elevator or frozen enemy)
$00B6 Crash Timer (stuns Player after falling too far)
$00B7 Boss Special Hitbox (bitmasked)
$00B8 Boss Melee Hitbox
01-03 = Doppelganger whip; 04 = Doppelganger staff;
05 = Death's Skull; 06 = Moat Dragon head;
$00B9 Boss Hitbox Phase (redundant with Doppelganger)
$00BA Bone Dragon King HP
$00BB Bone Dragon King Misc. Ticker
$00BC Faint Pause (pauses game when killed or time runs out)
$00BD Flood Paused (only set when Bone Dragon flees?)
$00BE Boss Object
$00BF Boss Second Phase (for Death, set then cleared for Bone Dragon)
$00C0 Boss Spawner ID
$00C1 #02 Boss Appearance Bitmask (used in conjunction with $0790, prevents ally swap)
$00C3 Autowalk Data Pointer (ref. $00:9140 for autowalk behavior)
00 = Clocktower/Default; 04 = Forest; 08 = Alucard Caves;
0C = Ghost Ship; 10 = Mountain Pass; 14 = Castle Keep
$00C4 Thaw Timer (for frozen waters)
$00C5 Horizontal Scroll Lock (used by crumbling bridge)
$00C7 Flood Height
$00C8 Flood Height Subpixel
$00C9 #02 Boss Stun Bitmask (similar to $00C1, stops animation, allows ally swap)
$00CB Weapon Kill Count (affects item drops)
$00CC Previous Conveyance (backup of $0088)
$00CD Vertical Ceiling (lowest y-coordinate in vertical room)
$00CF Cogwheel ID Copy
$00D0 Grant Corner Y-Coordinate
$00D1 Cogwheel ID
$00E0 #02 Audio Current Note Address
$00E2 #02 Audio Redirect Address
Audio Data Temporary Variable
$00E4 #02 Audio Data 16-bit Variable
$00E6 #02 Audio Track Base Address
$00E8 #02 Audio Track Address
$00EA Audio Channels to Load
$00EB Audio Routine PROM Bank
$00EC #02 Audio Current Period (i.e., pitch)
$00EE Audio Current Channel
$00EF Audio Track ID
$00F0 #04 Candle Status (32-bit mask)
$00F4 #04 Breakable Wall Status
00 = unused/unbroken; ff = broken
$00F8 #02 Previous Controller Buttons Pressed
$00FA #02 Previous Controller Buttons Held
$00FC #02 PPU Scroll
$00FE PPU Mask (for hue shifts and greyscale)
$00FF PPU Control
Audio channels: (grouped by 5, 7, or 9)
00 = Pulse 1; 01 = Pulse 2; 02 = Sawtooth; 03 = BGM Square 1; 04 = BGM Square 2
05 = SFX Square 1; 06 = SFX Square 2;
07 = Drums (DCM & Noise); 08 = Noise
$0100 #09 Audio Channel Note Duration
$0109 #09 Audio Channel Song ID
$0112 #09 Audio Channel Next Note Duration
$011B #09 Audio Channel Behavior
bit 0 = SFX (ignore ritenuto); bits 1-2 = init/decay/sustain/release;
bit 3 = Al segno loop; bit 5 = coda loop; bit 6 = ignore envelope;
$0124 #09 Audio Channel Loop Count
$012D #09 Audio Channel Note Address Low Byte
$0136 #09 Audio Channel Note Address High Byte
$013F #09 Audio Channel Al Segno Address Low Byte
$0148 #09 Audio Channel Al Segno Address High Byte
$0151 #09 Audio Channel Coda Address Low Byte
$015A #09 Audio Channel Coda Address High Byte
$0163 #09 Audio Channel Previous Period High Byte
$016A Audio Global Dampening (lowers volume for all channels)
$016C #09 Audio Channel Volume
$0173 Audio Global Fade Timer (decreases $017C after 2b steps)
$0175 #09 Audio Channel Next Control Value / Channel Dampening Placeholder
$017C Audio Global Fade Delay
$017E #09 Audio Channel Default Duty Cycle
$0185 Audio Global Mute for Pause
$0187 #07 Audio Channel Dampening (lowers volume for specific channel)
$018E #07 Audio Channel Attributes
bit 4 = use waveform; bit 5 = alternate duty; bit 7 = disabled needs more info
$0195 #07 Audio Channel Pitch Bend Amount
$019C #02 Audio SFX Square Sweep
$019E Audio DPCM ID
$019F #02 Audio Square Period Low Byte (write to $4002/$4006)
$01A3 #05 Audio Channel Octave (raises octave by 5-n)
$01A8 #05 Audio Channel Note Offset
(adds signed value to note ID to look up period)
$01AD #05 Audio Channel Period Low
$01B2 #05 Audio Channel Period High
$01B7 #05 Audio Channel Volume Envelope
(if bit 7 set, fade out instead based on bits 0-3)
$01BC Audio SFX Square Register Offset
$01BD Audio Global Ritenuto Delay (counts up to $01BE)
$01BE Audio Global Ritenuto Cutoff (frames until $01BF set)
$01BF Audio Global Ritenuto (prolongs BGM note duration when set)
$0200 #100 OAM Data
$0300 #a0 Tile Data
$03C0 #05 Audio Channel Volume Envelope Duration
$03C5 #05 Audio Channel Volume Envelope Position
$03CA #05 Audio Channel Volume Envelope Loop Count
$03CF #05 Audio Channel Volume Envelope Loop Point
$03D4 #05 Audio Channel Fadeout Point (fades out when equal to $100,X)
$03D9 #05 Audio Channel Volume Envelope
(bits 0-3 = value; $03D4 = duration*value >> 4)
$03DE #05 Audio Channel Next Fade Duration
$03E3 #05 Audio Channel Fade Duration
$03E8 #05 Audio Channel Alternate Duty Cycle
$03ED #05 Audio Channel Next Pitchbend Duration
$03F2 #05 Audio Channel Pitchbend Duration
$03F7 #05 Audio Channel Sweep Rate
$0400 #1c Sprite Frame Index
$041C #1c Y-Coordinate
$0438 #1c X-Coordinate
$0454 #1c Sprite Attributes (palette & background priority)
$0470 #1c Attributes
01 = destroyed; 02 = frozen; 04 = unknown; 08 = flicker;
10 = illusory; 20 = inanimate; 40 = moving; 80 = invisible
$048C #1c Animation Batch (even numbers)
00-06 = Player; 08-12 = NPCs; 14 = Epilogue; 16-1C = Doppelganger
$04A8 #1C Sprite Mirrored
$04C4 #17 X-Coordinate Subpixel
$04DB #17 Y-Coordinate Subpixel
$04F2 #17 Horizontal Speed
$0505 Partner Swap Ghosting Amount
$0509 #17 Horizontal Speed Subpixel
$051C Partner Swap Ghosting Amount Fractional
$0520 #17 Vertical Speed
$0537 #17 Vertical Speed Subpixel
$054E #17 Object Index
$0565 Player State
$0566 #11 Stun Timer
$0578 Weapon State
$0579 #03 Subweapon State
$057C #17 Animation Timer
$0593 #17 Sprite Frame (used to calculate $0400,X)
$05AA #17 Sprite Index
$05C1 Moving Down
$05C2 #12 NPC State
$05D4 Player Stunned State
Partner Swap X-Coordinate
$05D5 #03 Subweapon Throw Delay
$05D8 Player Jump State
00-1D = Trevor/Syfa/Alucard; 1E-39 = Grant
$05D9 #0c Boss Use
$05E5 #06 Candle Drop
83 = Axe; 84 = Cross; 85 = Dagger; 86 = Holy Water; 87 = Stopwatch;
88 = Syfa Fire; 89 = Syfa Ice; 8a = Syfa Water; 8b = Grant Dagger;
8c Grant Axe; 8d-8f = Upgrades (8f removed); 90 = Wall Meat;
91 = Invincibility Potion; 92 = Rosary; 93-9b = Coins; 9c = 1UP;
9d = Big Heart; 9e = Small Heart; 9f-a0 = Multipliers
$05EB Stair Stun Timer
Partner Swap Ghosting Speed Fractional
$05EF Stair Direction
Grant Jump State Fraction (functions like speed variables)
$05F0 #12 AI Class (determines behavior)
$0602 Stair Stun (decreases $05EB)
Freezing Rivers
Turning Into Bat
Partner Swap Ghosting Speed
$0606 Grant Gravity Subpixel (increases $05EF for Grant)
$0607 #12 State Timer (time between state changes for most NPCs)
Sinusoid Center Axis
$0619 Partner Swap Y-Coordinate
$061A #03 Subweapon Damage and Multikill Count
$061D Stair Timer (time to climb one step)
Grant Gravity (increases $05D8 for Grant)
$061E #12 Miscellaneous Ticker (usually timer or counter for NPCs)
$0630 Weapon Damage
$0631 #03 Subweapon Deflection (copy of $0658,X on Cross hit)
$0634 #17 Miscellaneous Use (used by a couple NPCs)
$0646 #12 Spawner Index
$0658 #0d NPC Damage
$0664 #06 Candle Active
$066A #12 Applied Effect (copy of $061A,X on subweapon hit)
$067B #12 NPC Hitpoints
$068E #12 Weapons Impact
01 = weapon; 02 = subweapon 1; 04 = subweapon 2; 08 = subweapon 3
$06A0 #05 Audio Channel Pitch Envelope Loop Start
$06A5 #05 Audio Channel Pitch Envelope ID
$06AA #05 Audio Channel Pitch Envelope Position
$06AF #05 Audio Channel Pitch Envelope Loop Count
$06B4 #05 Audio Channel Sustain State
$06B9 #05 Audio Channel Sustain Position (from 0 to 3)
$06BE #05 Audio Channel Sustain Dampen
$06C3 #04 Audio BGM Square 1 Sustain Period Low Bytes
$06C7 #04 Audio BGM Square 2 Sustain Period Low Bytes
$06CB #04 Audio BGM Square 1 Sustain Period High Bytes
$06CF #04 Audio BGM Square 2 Sustain Period High Bytes
$06D3 #09 Audio Channel PROM Bank
$06DC Music Paused
$06DD Boss Scream Duration stops DPCM playback
$06E0 #90 Collision Map
00 = empty; 01 = mud; 02 = convey right; 03 = convey left;
04 = fragile; 05 = ceiling spike; 06 = solid; 07 = floor spike;
08 = ice; 0c-0f = cracking
$0770 #08 CHR5 Solid Definitions
Byte 0 = empty; Byte 1 = mud; Byte 2 = convey right; Byte 3 = convey left;
Byte 4 = fragile; Byte 5 = ceiling spike; Byte 6 = solid; Byte 7 = floor spike
$0778 #08 CHR6 Solid Definitions
$0780 Entry Selector Column
Background Animation Frame
Map Clipping
00 = To Grant; 01 = To Syfa; 02 = From Alucard
$0781 Background Animation Timer
Entry Selector Row
Map Fade-out Value
$0782 #40 Fog Parallax Positions
32 rows of parallax with 2 bytes per row:
Byte 0 = subpixel offset; Byte 1 = pixel offset
Previous Selector Column
Map Timer
Epilogue Partner
Sypha's Frozen Tile Column
$0783 Previous Selector Row
Map Horizontal Speed Subpixel
Epilogue State
Sypha's Frozen Tile Row
Death Skull IRQ Latch
$0784 Name Cursor Position
Map Horizontal Speed
Castle Shake Direction
Leftmost Frozen Tile Column
Death Skull Floor IRQ Latch (always 86)
$0785 #02 Death Skull PPU Address
Map Vertical Speed Subpixel
Epilogue Text Page
Leftmost Frozen Tile Row
$0786 Password Icon
Map Vertical Speed
Rightmost Frozen Tile Column
$0787 Previous Password Icon
Map Scroll Timer
Rightmost Frozen Tile Row
Death Skull Background Position
$0788 #02 Password Decryption Dump
Map X-coordinate Subpixel
Epilogue Scroll Timer
Water Freeze Counter
$0789 Map Y-coordinate Subpixel
Frozen Water Room Type
$078A Epilogue Timer
Map Path PPU Scroll
Death Skull IRQ Latch Copy
$078B Map Path PPU Control
Password Errors (used for debugging)
Death Skull Floor IRQ Latch
$078C #02 Map Path PPU Address
#02 Death Skull PPU Address
Update Selector
$078E Death Skull Background Position
$078F #02 Death Skull Copy of $0788 and $0789 (unused)
$0790 #10 Entered Password
00 = empty; 01 = whip; 02 = cross; 03 = heart
#10 Boss Delay Timer (delays primary boss logic)
Map Screen Platform
00 = full; 01 = short west; 02 = bottom east;
03 = top west; 04 = middle west; 05 = bottom west
$07A0 #0a Generated Password
$07B1 #02 Stacked Breakable Wall
$07B3 #02 Lower Block Broken
$07B5 #02 Upper Block Broken
$07B7 #02 Wall ID (points to $00F4,X)
$07C2 #06 Spawner Type
$07C8 #06 Spawner State
$07CE #06 Spawner Timer
$07D4 #06 Spawner Y-Coordinate
$07DA #06 Spawner x-Coordinate
$07E0 #06 Spawner Offscreen
$07E6 #06 Spawner NPC Object
$07EC #06 Bone Dragon King Frames (two ribs per byte)
Various Boss Uses
specific uses by address:
$07EC Cyclops Lightning State
Giant Bat Leader
Alucard Bat Leader
Medusa Leader
Death Aggro
bit 3 = goto next phase; bit 6 = skull form; bit 7 = attacking
Doppelganger Character (same as $0634, for subweapons only)
Dracula Phase
00 = Dracula; 01 = demon; 02 = Pazuzu
$07ED Giant Bat State
Alucard Bat State
Medusa Snakes Merged (bitmasked)
Death Movement
bit 1-2 = horizontal speed; bit 3-4 = vertical speed; left if bit 3 set
Creature Shake Amount
Moat Dragon #1 Withdraw Speed (ff = normal; fe = slain)
Doppelganger Keypress (only 01 or 02 used for jumping)
01 = right; 02 = left; 03 = down; 04 = up; 05 = B; 06 = Up
$07EE Giant Bat Swarm State
Alucard Bat Swarm State
Death Scythe Limit
Wisp Defeats (00 = none; 01 = Mummy; 02 = Cyclops; 03 = Baphomet)
Moat Dragon #1 Height
Doppelganger Status When Hit
$07EF Moat Dragon #2 Withdraw Speed
ff = normal; fe = slain
Alucard Form
00 = humanoid; 01 = wisp; 02 = bat swarm;
03 = bat gathering; 04 = smoke
Death Scythe Count (for spawn positioning)
Doppelganger Recovered (impedes AI for one frame)
$07F0 Moat Dragon #2 Height
Alucard Transform Delay
$07F1 Mummy Boss Tally
Giant Bat Stunned
Alucard Bat Converge (arguably useless)
Death Transitioning
$07EC Bone Dragon Cycle
Map Effects Timer
$07ED Bone Dragon Mirrored
Stage Clear State (XORed by #80 if new partner declined)
Collapsing Bridge Length
$07EE Bone Dragon Fireball Timer
$07EF Bone Dragon Attacking
Story Text
$07F0 Story Line
$07F1 #02 Story Text Address
Meeting Dialogue Timer
$07F3 Boss Battle State
00 = boss fight; 01 = boss defeat; 02 = crystal drop;
03 = battle over; 80 = boss waiting
Stage Clear Delay (timer after battle over)
$07F6 Hard Mode
$07F8 #08 Player Name
Internal Data for Castlevania III
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