Difference between revisions of "Castlevania III:RAM map"

From Data Crystal
Jump to navigation Jump to search
(Added audio engine mappings for AkuDen. Some bytes still missing or incorrect, in all honesty. Better than nothing!)
m (just some stylistic changes)
Line 4: Line 4:
 
  $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              Step Counter
Line 13: Line 13:
 
  $001F              Randomizer
 
  $001F              Randomizer
 
  $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
  $002B              User Paused (toggled by Start button)
+
  $002B              User Paused ''(toggled by Start button)
 
  $002C              Boss Defeated
 
  $002C              Boss Defeated
 
  $002E              Checkpoint
 
  $002E              Checkpoint
Line 28: Line 28:
 
  $0036      #03    Score   
 
  $0036      #03    Score   
 
  $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)
 
  $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)  
+
  $0056      #02    View Position ''(little endian)  
 
  $0058              View Subpixel Position
 
  $0058              View Subpixel Position
 
  $0059              Left Spawn Area
 
  $0059              Left Spawn Area
Line 48: Line 48:
 
  $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              Player Animation State (for transitions)
+
  $006B              Player Animation State ''(for transitions)
 
                     and menu selections
 
                     and menu selections
  $006C              Current Instance (saves X register)
+
  $006C              Current Instance ''(saves X register)
 
  $006D              Drawing State
 
  $006D              Drawing State
 
  $006E              View Speed
 
  $006E              View Speed
Line 63: Line 63:
 
  $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 74: Line 74:
 
  $007B              Spawner Count
 
  $007B              Spawner Count
 
  $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
 
  $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
 
  $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)
+
  $009C              Subweapon Kill Count ''(affects multiplier drops)
  $009D              Variable Jump (for Grant)
+
  $009D              Variable Jump ''(for Grant)
 
  $009E              Subweapon Iterator
 
  $009E              Subweapon Iterator
 
  $009F              Previous Game State
 
  $009F              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)
 
  $00A5              Check Right Tile
 
  $00A5              Check Right Tile
 
  $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)
+
  $00B8              Current Platform ''(ID of elevator or frozen enemy)
  $00B9              Crash Timer (stuns Player after falling too far)
+
  $00B9              Crash Timer ''(stuns Player after falling too far)
 
  $00BA              Boss Fight
 
  $00BA              Boss Fight
  $00BF              Faint Pause (pauses game when killed or time runs out)
+
  $00BF              Faint Pause ''(pauses game when killed or time runs out)
  $00C8              Horizontal Scroll Lock (used by crumbling bridge)
+
  $00C8              Horizontal Scroll Lock ''(used by crumbling bridge)
 
  $00CA              Flood Height
 
  $00CA              Flood Height
  $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)
  $00D0              Vertical Ceiling (lowest y-coordinate in vertical room)
+
  $00D0              Vertical Ceiling ''(lowest y-coordinate in vertical room)
 
  $00EF              Audio Sample
 
  $00EF              Audio Sample
  $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
 
  $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  
 
  $0200      #100    OAM Data
 
  $0200      #100    OAM Data
Line 148: Line 149:
 
  $0454      #1c    Pallet Offset
 
  $0454      #1c    Pallet Offset
 
  $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
Line 165: Line 166:
 
  $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
Line 172: Line 173:
 
  $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;  
+
                            '' 91 = Invincibility Potion; 92 = Rosary; 93-9b = Coins; 9c = 1UP;  
                              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
 
  $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)
+
  $0606              Grant Gravity Subpixel ''(increases $05EF for Grant)
  $0607      #12    State Timer (time between state changes for most NPCs)
+
  $0607      #12    State Timer ''(time between state changes for most NPCs)
 
                     Sinusoid Center Axis
 
                     Sinusoid Center Axis
 
  $0619              Ally Swap Y-Coordinate
 
  $0619              Ally Swap Y-Coordinate
 
  $061A      #03    Subweapon Damage
 
  $061A      #03    Subweapon Damage
  $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
 
  $06DC              Music Paused
 
  $06DC              Music Paused
 
  $06DD              Boss Scream Cutoff
 
  $06DD              Boss Scream Cutoff
 
  $06E0      #90    Collision Map
 
  $06E0      #90    Collision Map
 
  $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 = crumbling; Byte 5 = ceiling spike; Byte 6 = solid; Byte 7 = floor spike
+
                               ''Byte 4 = crumbling; 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
 
  $0780              Entry Selector Column
 
  $0780              Entry Selector Column
 
  $0780              Map Clipping
 
  $0780              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
 
  $0781              Entry Selector Row
 
  $0781              Entry Selector Row
Line 238: Line 239:
 
  $078A              Epilogue Timer
 
  $078A              Epilogue Timer
 
  $078A              Map Path PPU Scroll
 
  $078A              Map Path PPU Scroll
  $078B              Password Errors (used for debugging)
+
  $078B              Password Errors ''(used for debugging)
 
  $088B              Map Path PPU Control
 
  $088B              Map Path PPU Control
 
  $078C      #02    Map Path PPU Address
 
  $078C      #02    Map Path PPU Address
 
  $078C              Update Selector
 
  $078C              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
 
  $0790              Map Screen Platform
 
  $0790              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
 
  $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 260:
 
  $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)
 
  $07EC              Cyclops Lightning State
 
  $07EC              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              Victory State
 
  $07ED              Victory State
 
                     Bone Dragon Mirrored
 
                     Bone Dragon Mirrored
Line 273: Line 274:
 
  $07EF              Bone Dragon Attacking
 
  $07EF              Bone Dragon Attacking
 
  $07F3              Boss Phase
 
  $07F3              Boss Phase
                               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 292: Line 293:
 
  $001D              Blackout Delay
 
  $001D              Blackout Delay
 
  $0020              Randomizer
 
  $0020              Randomizer
  $0021              PPU Bank (write to $B003)
+
  $0021              PPU Bank ''(write to $B003)
 
  $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;''
Line 298: Line 299:
 
  $002A      #02    Controller Buttons Held
 
  $002A      #02    Controller Buttons Held
 
  $002C              Game State
 
  $002C              Game State
  $002D              User Paused (toggled by Start button)
+
  $002D              User Paused ''(toggled by Start button)
 
  $002E              Boss Defeated  
 
  $002E              Boss Defeated  
  $0030              Checkpoint (used for Password Entry)
+
  $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 311:
 
  $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
 
  $0048              Partner   
 
  $0048              Partner   
Line 318: Line 319:
 
                             ''40 = full''
 
                             ''40 = full''
 
  $004B              Boss Health  
 
  $004B              Boss Health  
  $004C              Score Target (for extra life)
+
  $004C              Score Target ''(for extra life)
 
  $0053      #02    View Position  
 
  $0053      #02    View Position  
 
  $0055              View Subpixel Position
 
  $0055              View Subpixel Position
Line 336: Line 337:
 
                             ''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              Player Animation State (for transitions)
+
  $0068              Player Animation State ''(for transitions)
  $0069              Current Instance (saves X register)
+
  $0069              Current Instance ''(saves X register)
 
  $006A              Drawing State
 
  $006A              Drawing State
 
  $006B              View Speed
 
  $006B              View Speed
Line 346: Line 347:
 
  $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 358: Line 359:
 
                             ''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
 
  $007F              PC Height
 
  $007F              PC Height
Line 383: Line 384:
 
  $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 390:
 
  $0092              Cogwheel Size
 
  $0092              Cogwheel Size
 
                             ''00 = small; 01 = large''
 
                             ''00 = small; 01 = large''
  $0099              Subweapon Kill Count (affects multiplier drops)
+
  $0099              Subweapon Kill Count ''(affects multiplier drops)
  $009A              Variable Jump (for Grant)
+
  $009A              Variable Jump ''(for Grant)
 
  $009B              Subweapon Iterator
 
  $009B              Subweapon Iterator
 
  $009C              Previous Game State
 
  $009C              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)
 
  $00A2              Check Right Tile
 
  $00A2              Check Right Tile
 
  $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)
+
  $00B5              Current Platform ''(ID of elevator or frozen enemy)
  $00B6              Crash Timer (stuns Player after falling too far)
+
  $00B6              Crash Timer ''(stuns Player after falling too far)
 
  $00B7              Boss Fight
 
  $00B7              Boss Fight
  $00BC              Faint Pause (pauses game when killed or time runs out)
+
  $00BC              Faint Pause ''(pauses game when killed or time runs out)
  $00C5              Horizontal Scroll Lock (used by crumbling bridge)
+
  $00C5              Horizontal Scroll Lock ''(used by crumbling bridge)
 
  $00C7              Flood Height
 
  $00C7              Flood Height
  $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)
  $00CD              Vertical Ceiling (lowest y-coordinate in vertical room)
+
  $00CD              Vertical Ceiling ''(lowest y-coordinate in vertical room)
 
  $00E0      #02    Audio Current Note Address
 
  $00E0      #02    Audio Current Note Address
 
  $00E2      #02    Audio Redirect Address
 
  $00E2      #02    Audio Redirect Address
Line 421: Line 422:
 
  $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 Song ID
 
  $00EF              Audio Song 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 431:
 
  $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 511: Line 512:
 
  $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
Line 528: Line 529:
 
  $05EB              Stair Stun Timer
 
  $05EB              Stair Stun Timer
 
  $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)
+
  $0606              Grant Gravity Subpixel ''(increases $05EF for Grant)
  $0607      #12    State Timer (time between state changes for most NPCs)
+
  $0607      #12    State Timer ''(time between state changes for most NPCs)
 
                     Sinusoid Center Axis
 
                     Sinusoid Center Axis
 
  $0619              Ally Swap Y-Coordinate
 
  $0619              Ally Swap Y-Coordinate
 
  $061A      #03    Subweapon Damage
 
  $061A      #03    Subweapon Damage
  $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
Line 601: Line 602:
 
  $078A              Epilogue Timer
 
  $078A              Epilogue Timer
 
  $078A              Map Path PPU Scroll
 
  $078A              Map Path PPU Scroll
  $078B              Password Errors (used for debugging)
+
  $078B              Password Errors ''(used for debugging)
 
  $088B              Map Path PPU Control
 
  $088B              Map Path PPU Control
 
  $078C      #02    Map Path PPU Address
 
  $078C      #02    Map Path PPU Address
Line 614: Line 615:
 
  $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 623:
 
  $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)
 
  $07EC              Cyclops Lightning State
 
  $07EC              Cyclops Lightning State
 
                     Bone Dragon Cycle
 
                     Bone Dragon Cycle

Revision as of 19:40, 29 July 2022

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              Step Counter
$001C              Blackout Delay
$001F              Randomizer
$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
$002B              User Paused (toggled by Start button)
$002C              Boss Defeated
$002E              Checkpoint
$002F              Grant Defeated
$0030       #02    System Effect Timer
$0032              Stage
$0033              Block
$0034              Room
$0035              Lives   
$0036       #03    Score  
$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)
$0046       #08    CHR Banks
$004E              Hard Mode CHR Bank (overwrites $0049)
$0056       #02    View Position (little endian) 
$0058              View Subpixel Position
$0059              Left Spawn Area
$005A              Right Spawn Area
$005C              Tile Assembly Row Iterator
$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              Player Animation State (for transitions)
                   and menu selections
$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
$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
$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
$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
$009C              Subweapon Kill Count (affects multiplier drops)
$009D              Variable Jump (for Grant)
$009E              Subweapon Iterator
$009F              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)
$00A5              Check Right Tile
$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)
$00B8              Current Platform (ID of elevator or frozen enemy)
$00B9              Crash Timer (stuns Player after falling too far)
$00BA              Boss Fight
$00BF              Faint Pause (pauses game when killed or time runs out)
$00C8              Horizontal Scroll Lock (used by crumbling bridge)
$00CA              Flood Height
$00CE              Weapon Kill Count (affects item drops)
$00CF              Previous Conveyance (backup of $0088)
$00D0              Vertical Ceiling (lowest y-coordinate in vertical room)
$00EF              Audio Sample
$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 
$0200      #100    OAM Data
$0300       #a0    Tile Data
$0400       #1c    Sprite Frame Index
$041C       #1c    Y-Coordinate
$0438       #1c    X-Coordinate 
$0454       #1c    Pallet Offset
$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
$0509       #17    Horizontal Speed Subpixel
$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
$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
$05EF              Stair Direction
                   Grant Jump State Fraction (functions like speed variables)
$05F0       #12    AI Class (determines behavior)
$0602              Stair Stun (decreases $05EB)
$0606              Grant Gravity Subpixel (increases $05EF for Grant)
$0607       #12    State Timer (time between state changes for most NPCs)
                   Sinusoid Center Axis
$0619              Ally Swap Y-Coordinate
$061A       #03    Subweapon Damage
$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
$06DC              Music Paused
$06DD              Boss Scream Cutoff
$06E0       #90    Collision Map
$0770       #08    CHR5 Solid Definitions
                             Byte 0 = empty; Byte 1 = mud; Byte 2 = convey right; Byte 3 = convey left;
                             Byte 4 = crumbling; Byte 5 = ceiling spike; Byte 6 = solid; Byte 7 = floor spike
$0778       #08    CHR6 Solid Definitions 
$0780              Background Animation Frame
$0780              Entry Selector Column
$0780              Map Clipping
                             00 = To Grant; 01 = To Syfa; 02 = From Alucard
$0781              Background Animation Timer
$0781              Entry Selector Row
$0781              Map Fade-out Value
$0782              Previous Selector Column
$0782              Map Timer
$0782              Epilogue Ally
$0783              Previous Selector Row
$0783              Map Horizontal Speed Subpixel
$0783              Epilogue State
$0784              Name Cursor Position
$0784              Map Horizontal Speed
$0784              Castle Shake Direction
$0785              Map Vertical Speed Subpixel
$0785              Epilogue Text Page
$0786              Password Icon
$0786              Map Vertical Speed
$0787              Previous Password Icon
$0787              Map Scroll Timer
$0788       #02    Password Decryption Dump
$0788              Map X-coordinate Subpixel
$0788              Epilogue Scroll Timer
$0789              Map Y-coordinate Subpixel
$078A              Epilogue Timer
$078A              Map Path PPU Scroll
$078B              Password Errors (used for debugging)
$088B              Map Path PPU Control
$078C       #02    Map Path PPU Address
$078C              Update Selector
$0790       #10    Entered Password
                             00 = empty; 01 = whip; 02 = cross; 03 = heart
$0790              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)
$07EC              Cyclops Lightning State
                   Bone Dragon Cycle
                   Giant Bat Leader
                   Dracula Phase
                             00 = Dracula; 01 = demon; 02 = Pazuzu
$07ED              Victory State
                   Bone Dragon Mirrored
                   Collapsing Bridge Length
                   Giant Bat State
$07EE              Bone Dragon Fireball Timer
                   Death Scythe Count
$07EF              Bone Dragon Attacking
$07F3              Boss Phase
                             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
--------   ----    -----------
$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
$001D              Blackout Delay
$0020              Randomizer
$0021              PPU Bank (write to $B003)
$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
$002D              User Paused (toggled by Start button)
$002E              Boss Defeated 
$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
$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)
$0053       #02    View Position 
$0055              View Subpixel Position
$0056              Left Spawn Area
$0057              Right Spawn Area
$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              Player Animation State (for transitions)
$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
$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
$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
$0099              Subweapon Kill Count (affects multiplier drops)
$009A              Variable Jump (for Grant)
$009B              Subweapon Iterator
$009C              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)
$00A2              Check Right Tile
$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)
$00B5              Current Platform (ID of elevator or frozen enemy)
$00B6              Crash Timer (stuns Player after falling too far)
$00B7              Boss Fight
$00BC              Faint Pause (pauses game when killed or time runs out)
$00C5              Horizontal Scroll Lock (used by crumbling bridge)
$00C7              Flood Height
$00CB              Weapon Kill Count (affects item drops)
$00CC              Previous Conveyance (backup of $0088)
$00CD              Vertical Ceiling (lowest y-coordinate in vertical room)
$00E0       #02    Audio Current Note Address
$00E2       #02    Audio Redirect Address
  $00E2              Audio Data Temporary Variable
$00E4       #02    Audio Data 16-bit Variable
$00E6       #02    Audio Song Base Address
$00E8       #02    Audio Song 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 Song 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 $01BF); bits 1-2 = playback state; bit 3 = pattern loop;
                             bit 6 = ignore envelope; needs more info
$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 Pattern Loop Address Low Byte
$0148       #09    Audio Channel Pattern Loop Address High Byte
$0151       #09    Audio Channel Repeat Address Low Byte
$015A       #09    Audio Channel Repeat 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 Volume
  $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              Audio SFX Square 1 Sweep (write to $4001)
$019E              Audio DPCM ID
$019F       #02    Audio Square Period Low Byte (write to $4002/$4006)
$01A3       #05    Audio Channel Downshift (doubles period of default note n times)
$01A8       #05    Audio Channel Note Offset
                             (adds signed value to note ID to look up period)
$01AD       #05    Audio Channel Period Low (usually write to each channel's period register)
$01B2       #05    Audio Channel Period High (usually write to each channel's period register)
$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)
$01C0       #40    The Stack
$0200      #100    OAM Data
$0300       #a0    Tile Data
$03C0       #05    Audio Channel Volume Duration
$03C5       #05    Audio Channel Fade Duration
$03D4       #05    Audio Channel Fade Out 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 Delay
$03E3       #05    Audio Channel Fade Delay
$03E8       #05    Audio Channel Alternate Duty Cycle
$03ED       #05    Audio Channel Next Envelope Duration
$03F2       #05    Audio Channel Envelope Duration
$03F7       #05    Audio Channel Sweep Rate
$0400       #1c    Sprite Frame Index
$041C       #1c    Y-Coordinate
$0438       #1c    X-Coordinate 
$0454       #1c    Pallet Offset
$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
$0509       #17    Horizontal Speed Subpixel
$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
$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
$05EF              Stair Direction
                   Grant Jump State Fraction (functions like speed variables)
$05F0       #12    AI Class (determines behavior)
$0602              Stair Stun (decreases $05EB)
$0606              Grant Gravity Subpixel (increases $05EF for Grant)
$0607       #12    State Timer (time between state changes for most NPCs)
                   Sinusoid Center Axis
$0619              Ally Swap Y-Coordinate
$061A       #03    Subweapon Damage
$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 
$06A5       #05    Audio Channel Pitch Envelope
$06AA       #05    Audio Channel Pitch Envelope Position
$06AF       #05    Audio Channel Pitch Envelope Loop Count
$06B4       #05    Audio Channel Pitch Envelope State
$06B9       #05    Audio Channel Arpeggio Position
$06C3       #04    Audio BGM Square 1 Arpeggio Low Bytes
$06C7       #04    Audio BGM Square 2 Arpeggio Low Bytes
$06CB       #04    Audio BGM Square 1 Arpeggio High Bytes
$06CF       #04    Audio BGM Square 2 Apreggio High Bytes
$06D3       #09    Audio Channel PROM Bank
$06DC              Music Paused
$06DD              Boss Scream Cutoff
$06E0       #90    Collision Map
$0770       #08    CHR5 Solid Definitions
                             Byte 0 = empty; Byte 1 = mud; Byte 2 = convey right; Byte 3 = convey left;
                             Byte 4 = crumbling; Byte 5 = ceiling spike; Byte 6 = solid; Byte 7 = floor spike
$0778       #08    CHR6 Solid Definitions
$0780              Background Animation Frame
$0781              Background Animation Timer
$0782              Epilogue Ally
$0783              Epilogue State
$0784              Castle Shake
$0785              Epilogue Text Page
$0780              Entry Selector Column
$0780              Entry Selector Column
$0780              Map Clipping
                             00 = To Grant; 01 = To Syfa; 02 = From Alucard
$0781              Background Animation Timer
$0781              Entry Selector Row
$0781              Map Fade-out Value
$0782              Previous Selector Column
$0782              Map Timer
$0782              Epilogue Ally
$0783              Previous Selector Row
$0783              Map Horizontal Speed Subpixel
$0783              Epilogue State
$0784              Name Cursor Position
$0784              Map Horizontal Speed
$0784              Castle Shake Direction
$0785              Map Vertical Speed Subpixel
$0785              Epilogue Text Page
$0786              Password Icon
$0786              Map Vertical Speed
$0787              Previous Password Icon
$0787              Map Scroll Timer
$0788       #02    Password Decryption Dump
$0788              Map X-coordinate Subpixel
$0788              Epilogue Scroll Timer
$0789              Map Y-coordinate Subpixel
$078A              Epilogue Timer
$078A              Map Path PPU Scroll
$078B              Password Errors (used for debugging)
$088B              Map Path PPU Control
$078C       #02    Map Path PPU Address
$078C              Update Selector
$0790       #10    Entered Password
                             00 = empty; 01 = whip; 02 = cross; 03 = heart
$0790              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)
$07EC              Cyclops Lightning State
                   Bone Dragon Cycle
                   Giant Bat Leader
                   Dracula Phase
                             00 = Dracula; 01 = demon; 02 = Pazuzu
$07ED              Victory State
                   Bone Dragon Mirrored
                   Collapsing Bridge Length
                   Giant Bat State
$07EE              Bone Dragon Fireball Timer
                   Death Scythe Count
$07EF              Bone Dragon Attacking
$07F3              Boss Phase
                             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


Internal Data for Castlevania III

ROM MapRAM MapText TableNotesTutorials