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Castlevania III: Dracula's Curse/RAM map: Difference between revisions
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TheouAegis (talk | contribs) mNo edit summary |
TheouAegis (talk | contribs) (Just found out $00C4/$00C1 was frozen status for bosses. Never noticed it because I never used Ice on bosses. And now I know how to make all bosses and boss attacks freezable!) |
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| Line 185: | Line 185: | ||
$00C2 Boss Second Phase | $00C2 Boss Second Phase | ||
$00C3 Boss Spawner | $00C3 Boss Spawner | ||
$00C4 #02 | $00C4 #02 Boss Frozen Bitmask ''(used in conjunction with $0790, also prevents ally swap) | ||
$00C6 Autowalk Data Pointer ''(ref. $00:9140 for autowalk behavior) | $00C6 Autowalk Data Pointer ''(ref. $00:9140 for autowalk behavior) | ||
''00 = Clocktower/Default; 04 = Forest; 08 = Alucard Caves; | ''00 = Clocktower/Default; 04 = Forest; 08 = Alucard Caves; | ||
| Line 192: | Line 192: | ||
$00C8 Horizontal Scroll Lock ''(used by crumbling bridge) | $00C8 Horizontal Scroll Lock ''(used by crumbling bridge) | ||
$00CA Flood Height | $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) | $00CE Weapon Kill Count ''(affects item drops) | ||
$00CF Previous Conveyance ''(backup of $0088) | $00CF Previous Conveyance ''(backup of $0088) | ||
| Line 412: | Line 414: | ||
$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 | #10 Boss Delay Timer ''(maintains current behavior while decreasing) | ||
Map Screen Platform | Map Screen Platform | ||
''00 = full; 01 = short west; 02 = bottom east; | ''00 = full; 01 = short west; 02 = bottom east; | ||
| Line 632: | Line 634: | ||
$00BF Boss Second Phase ''(for Death, set then cleared for Bone Dragon) | $00BF Boss Second Phase ''(for Death, set then cleared for Bone Dragon) | ||
$00C0 Boss Spawner ID | $00C0 Boss Spawner ID | ||
$00C1 #02 | $00C1 #02 Boss Appearance Bitmask ''(used in conjunction with $0790, prevents ally swap) | ||
$00C3 Autowalk Data Pointer ''(ref. $00:9140 for autowalk behavior) | $00C3 Autowalk Data Pointer ''(ref. $00:9140 for autowalk behavior) | ||
''00 = Clocktower/Default; 04 = Forest; 08 = Alucard Caves; | ''00 = Clocktower/Default; 04 = Forest; 08 = Alucard Caves; | ||
| Line 640: | Line 642: | ||
$00C7 Flood Height | $00C7 Flood Height | ||
$00C8 Flood Height Subpixel | $00C8 Flood Height Subpixel | ||
$00C9 #02 Boss Stun Bitmask | $00C9 #02 Boss Stun Bitmask ''(similar to $00C1, stops animation, allows ally swap) | ||
$00CB Weapon Kill Count ''(affects item drops) | $00CB Weapon Kill Count ''(affects item drops) | ||
$00CC Previous Conveyance ''(backup of $0088) | $00CC Previous Conveyance ''(backup of $0088) | ||
| Line 867: | Line 869: | ||
$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 | #10 Boss Delay Timer ''(delays primary boss logic) | ||
Map Screen Platform | Map Screen Platform | ||
''00 = full; 01 = short west; 02 = bottom east;'' | ''00 = full; 01 = short west; 02 = bottom east;'' | ||
Revision as of 20:19, 16 October 2023
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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