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Castlevania (NES)/RAM map
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The following article is a RAM map for Castlevania (NES).
Address Size Description
-------- ---- -----------
$0012 02 Various
CHR Data Pointer
Points to CHR data, stored as follows:
byte 0 = value for $0027; byte 1-2 = CHR data RAM address;
byte 3-4 = PPU write address; byte 5-6 = data size
$0018 System State
00 = Booting; 01 = Title Screen; 02 = Demo Mode; 03 = Start Game;
04 = Introduction; 05 = Gameplay; 06 = Respawning; 07 = Game Over;
08 = Door Transition; 09 = Autowalk; 0a = Entering Castle; 0b = Autoclimb;
0c = Scoring & Map; 0d = Continue; 0e = Falling; 0f = Ending
$0019 System Substate
$001A Frame Counter (resets to 01 when changing rooms)
$001B Graphics Enabled
$001D Transition Timer (used for autowalk sequences, death animation, and loading rooms)
$001E Title Screen Bat State
$001F Fade-in Timer
$0020 Tile Data Pointer
$0022 User Paused
$0024 Current ROM Bank
$0027 Previous ROM Bank
$0028 Stage
$0029 Previous Stage
$002A Lives (01 = last life, can be set to #ff but displays as 99 max)
$002B Difficulty
$002C Score Target (grants 1Up when equal to $07FE, then increments by 3)
$002D View Position Subpixel
$002E 02 View Position
$0035 Rightmost Tile Section
$0036 Leftmost Tile Section
$0037 02 Tile Map 1 Address
$0039 02 Tile Map 2 Address
$003B Tile Refresh Cutoff (toggles #20 every 32 pixels view moves)
$003C Scroll State
bit 0 = scroll right; bit 1 = scroll left; bit 2 = at room edge
$003D Scroll Speed Subpixel
$003E Off Stairs (always 00 at start of frame)
$003F Simon Real Y-Coordinate
$0040 02 Simon X-Coordinate Copy (for solid collisions)
$0042 02 Timer
$0044 Simon Display Health (adjusts every 4 frames to match $0045)
$0045 Simon Real Health
$0046 Floor (for stages with stair transitions)
$0047 Stun Timer (when hit by enemies)
$0048 Boss Screen (locks scrolling)
$0049 Rightward Scroll Speed
$004A Music Continuity (00 = load new BGM after stair & gate transitions)
$004B Various
Y-coordinate offset for solid collision
Whip Collision Object
Sprite Mirrored copy for rendering
Subweapon ID ($015B - #08)
Display Health copy for adjusting health bars gradually
Crusher Y-Offset
$004C Various
X-coordinate offset for solid collision
Sprite Data Low Byte
Enemy Drops Low Byte (indexed by [Stage-1]/3)
Collision Width (max horizontal distance in collision check)
Tile Solidity
40 = #5F<Tile ID<#6C; 80 = Tile ID is #66
$004D Various
Sprite Data High Byte
Enemy Drops High Byte
Collision Height (max vertical distance in collision check)
$004E Various
Tile Position Iterator (when loading new tiles)
Current Instance ID
Current Crusher ID
$004F Various
Potential Spawner Pointer
Off-screen Attribute Overflow
Crusher Sequence ($001A - $004E)
$0051 Scroll Attribute Mask (ref. $0300)
00 = scrolled right; ff = scrolled left
$0052 Scroll Speed
$0053 Scroll Speed subpixel
$005B Wounded Timer (for iFrames)
$005F Simon Height
$0063 Ghoul Counter (spaces Ghouls apart in Stages 01 & 20)
$0064 Weapon Multiplier
$006D Spawn Area To Load ($0075-5 or $0076+5)
$006F Randomizer
$0070 Whip Level
$0071 Hearts
$0072 Subweapon Dropped (prevents multiple subweapons dropping)
$0073 Whip Length
$0074 Whip Height
$0075 Leftward Stage Spawn Zone
$0076 Rightward Stage Spawn Zone
$0079 Subweapon Kills (until Multiplier drop)
$007B Enemy Drops ($007B & 3 determines item, ref. $004C)
$007D Invincibility Potion Timer (unused, game uses $005B instead)
$007F Ignore Sound Effect Request
$0080 Square Wave 1 Duration
$0081 Square Wave 1 Octave
$0082 Square Wave 1 Track
$0083 02 Square Wave 1 Note Address
$0085 Square Wave 1 Volume Envelope
$0087 Square Wave 1 Volume Write
$0088 Square Wave 1 Halt
$0089 Square Wave 1 Next Duration
$008A Square Wave 1 Timbre
$008B Square Wave 1 Fade Delay
$008C Square Wave 1 Fade
$008D Square Wave 1 Fade Speed
$008E 02 Square Wave 1 Loop Address
$0090 Square Wave 2 Duration
$0091 Square Wave 2 Octave
$0092 Square Wave 2 Track
$0093 02 Square Wave 2 Note Address
$0095 Square Wave 2 Volume Envelope
$0097 Square Wave 2 Volume Write
$0098 Square Wave 2 Halt
$0099 Square Wave 2 Next Duration
$009A Square Wave 2 Timbre
$009B Square Wave 2 Fade Delay
$009C Square Wave 2 Fade
$009D Square Wave 2 Fade Speed
$009E 02 Square Wave 2 Loop Address
$00A0 Triangle Wave Duration
$00A1 Triangle Wave Octave
$00A2 Triangle Wave Track
$00A3 02 Triangle Wave Note Address
$00A5 Triangle Wave Linear Counter
$00A7 Audio Timer Low copy 1
$00A9 Triangle Wave Next Duration
$00AB Audio Channel Index
80 = Square 1; 90 = Square 2; A0 = Triangle
B0 = Noise; C0 = Square 1 SFX; D0 = Square 2 SFX
$00AC Audio Channel Offset
$00AE 02 Triangle Wave Loop Address
$00B0 Noise Duration
$00B1 Noise Octave?
$00B2 Noise Track
$00B3 02 Noise Note Address
$00B7 Noise Volume
$00B8 Audio Timer Low copy 2
$00BA 02 Working Note Address (used by all channels)
$00BC Audio Timer Hi
$00BD Audio Timer Low
$00BE 02 Updated Note Address (same as $0083, $0093, $00A3, and $00B3)
$00C0 Square Wave 1 SFX Duration
$00C1 Square Wave 1 SFX Octave
$00C2 Square Wave 1 SFX Track
$00C3 02 Square Wave 1 SFX Note Address
$00C5 Square Wave 1 SFX Volume Envelope
$00C7 Square Wave 1 SFX Volume Write
$00C8 Square Wave 1 SFX Halt
$00C9 Square Wave 1 SFX Next Duration
$00CA Square Wave 1 SFX Timbre
$00CB Square Wave 1 SFX Fade Delay
$00CC Square Wave 1 SFX Fade
$00CD Square Wave 1 SFX Fade Speed
$00CE 02 Square Wave 1 SFX Loop Address
$00D0 Square Wave 2 SFX Duration
$00D1 Square Wave 2 SFX Octave
$00D2 Square Wave 2 SFX Track
$00D3 02 Square Wave 2 SFX Note Address
$00D5 Square Wave 2 SFX Volume Envelope
$00D7 Square Wave 2 SFX Volume Write
$00D8 Square Wave 2 SFX Halt
$00D9 Square Wave 2 SFX Next Duration
$00DA Square Wave 2 SFX Timbre
$00DB Square Wave 2 SFX Fade Delay
$00DC Square Wave 2 SFX Fade
$00DD Square Wave 2 SFX Fade Speed
$00DE 02 Square Wave 2 SFX Loop Address
$00E0 02 Audio Track Address
$00E2 Audio Fade-Out
$00E3 Audio Fade-Out Timer
$00E4 Audio Track Offset
$00E5 Audio Track
$00E6 Channel Pointer Alternate
$00E7 Channel Pointer
$00EE Stopwatch Mute
$00EF Pause Music
$00F1 02 Demo Behavior Address
$00F3 Demo Cycle (determines stage and behavior)
$00F4 Demo Mode
$00F5 Gamepad 1 Input Pressed
$00F6 Gamepad 2 Input Pressed
$00F7 Gamepad 1 Input Held
$00F8 Gamepad 2 Input Held
$00FC 02 PPU Scroll
$00FE PPU Mask (to change colors or disable sprites)
$00FF PPU Control
$0143 Fall Distance (stuns if greater than 7 when landing)
$0144 Secrets Found (per stage)
$0145 Secret Timer (how long Simon stands still)
$0146 Blocks Broken
$014A 03 Crusher State
bit 0 = active; bit 2 = pause all crushers; bit 3 = falling
$014D 03 Crusher Y-Coordinate (top of chain)
$0150 03 Crusher X-Coordinate Low
$0153 03 Crusher X-Coordinate High
$0156 03 Crusher Position
bits 0-3 = vertical-offset, multiplied by 8;
bits 4-7 = return position ($0156 >> 4 = $004B)
$015B Subweapon
08 = Dagger; 09 = Boomerang; 0A = Rosary (cut);
0B = Holy Water; 0D = Axe; 0F = Stopwatch
$015C Subweapons Locked
$015D Rosary Flash
Spawners indexed by position in room, modulo 06
$0160 06 Spawner Disabled
$0166 06 Spawner Object
$016C 06 Spawner State
$0172 06 Spawner X-Coordinate
$017E 06 Spawner Y-Coordinate
$0184 06 Spawner Timer
$0190 0f Candle Status
0f = upper floor destroyed; f0 = lower floor destroyed
$01A9 Boss Real Health
$01AA Boss Display Health
$0200 ff OAM Data
Instances typically ordered as follows:
Gameplay:
00 = Simon; 01-02 = Whip; 03-0d = Enemies; 0e-13 = Candles;
14-16 = Subweapons; 17 = Hidden Treasure; 17-18 = Moving Platforms;
18-1b = Debris (deliberately handled even while game is paused)
Title Screen:
00 = Bat; 01 = "C" Top; 02 = "C" Bottom
Gate Screen:
00 = Simon; 01 = Cloud; 02 = Left Bat; 03 = Right Bat
Map Screen:
00 = Simon; 17 = Map Position; 18 = Target Position;
$0300 1c Attributes
bit 0 = In-view; bit 7 = Invisible
$031C 1c Sprite Frame
$0338 1c Pallet Offset
$0354 1c Y-Coordinate
$0370 1c Y-Coordinate Subpixel
$038C 1c X-Coordinate
$03A8 1c X-Coordinate Subpixel
$03C4 1c Vertical Speed
$03E0 1c Vertical Speed Subpixel
$03FC 1c Horizontal Speed
$0418 1c Horizontal Speed Subpixel
$0434 1c Object Index
Simon's Objects (just another state machine):
00 = Passive; 01 = Standing Whip (and on stairs); 02 = Ducking Whip;
03 = Jumping Whip; 81 = Standing Subweapon; 83 = Jumping Subweapon
$0450 1c Sprite Mirrored
$046C 1c State
Simon's States:
00 = Walking; 01 = Jumping (and Air Attack); 02 = Ground Attack;
03 = Ducking; 04 = Climbing Stairs; 05 = Knocked Back;
06 = Approach Stairs; 07 = Dropping; 08 = Dead; 09 = Stunned;
$0488 Jump State
$0489 1b Animation Time
$049F Moving Platform Speed (doubles per speed)
$04A4 Simon Step Count (determines walking sprite frame)
$04A5 1b Animation Frame
$04C0 1c Sprite Index
$04C2 Gate Bats Animation Timer (changes image every 4 frames)
$04C3 Gate Right Bat Bob Timing
$04DC Vertical Vector Address Low Byte
$04DF 0b Various
Bat & Medusae Base Focal Y-coordinate
Simon above enemy
Skeleton Motion Substate
Fishman walking
Bone Dragon Part Motion Substate
Axe Armor Axe ID
$04DF Gate Right Bat Bob Offset (add to $0533)
$04EA 06 Candle Index (for $0190,Y writes)
$04F0 03 Subweapon Collision ID
$04F8 Vertical Vector Address High Byte
$04FB 11 Various
Movement Direction for moving backward
00 = right; 01 = left;
Bone Dragon Part Vertical Offset
Drop Pickup Delay (pointless)
$050C 03 Individual Subweapon Kills
$050F 04 Moving Platform X-Coordinate Subpixel
$0514 Vertical Direction
$0517 11 Various
Small Heart Focal X-coordinate
Bone Dragon Part Vertical Offset Subpixel
$052B Moving Platform Left Edge
$0530 Simon Attack State (same as $046C)
$0531 15 Spawner ID (based on 6 room positions)
$0533 Gate Right Bat Y-Origin
$054C In-Air Attack
$054F 0d Generic Timer
$0568 Whip Timer (counts up to #16)
$056B 11 Extinguish Timer (duration of flare and drop)
For subweapons:
Boomerang = return time; Holy Water = burn duration
$057F 02 Moving Platform Y-coordinate Subpixel
$0582 Hidden Treasure Object
00 = Coins; 01 = 1UP; 02 = Crown; 03 = Chest; 04 = Moai
$0584 Gamepad 1 Input Held Copy
$0587 11 Item Drop
$059B 02 Moving Platform Y-Coordinate
$05A0 160 Collision Map
$0700 c0 Tile Data Dump
$07F5 Previous Y Register (when audio loaded)
$07F6 Next Sound Effect
$07F8 Demo Gamepad Input Delay
$07F9 Demo Gamepad Input Pressed
$07FA Demo Gamepad Input Held
$07FC 03 Score ($07FE used for 1UP checks)
Internal Data for Castlevania (NES)
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