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Yu-Gi-Oh! Dark Duel Stories/RAM map
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The following article is a RAM map for Yu-Gi-Oh! Dark Duel Stories.
VRAM
Address Size Description ------- ---- ----------- 8800 1280 On the field: Card Illustration
SRAM
Address Size Description ------- ---- ----------- A7D4 2 Deck Capacity (SRAM) B7FF 1 Erase save file and start Debug New Game
WRAM
Address Size Description
------- ---- -----------
C100 2 Pointer
C102 8 Password digits offsets
C10C 8 Name Entry characters
C400 2 ?
C426 2 Pointer to the Music data being read
C428 2 ROM Bank of the Music data being read
C42A 2 Music pointer
C42C 2 Music ROM Bank
C42E 2 Start of Music loop
C436 1 Current ROM Bank, or Screen ID when unused for Bank switching purposes
0x01 : Pre-duel screen
0x02 : CPU opponent's talking
0x03 : Player's turn in duel
0x04 : Menus / Title Screen
0x05 : Card display / Text box in duel
0x06 : Monster battle end
0x07 : CPU's turn in duel (inputs disabled)
0x09 : Password Screen
0x0A : "To Be Continued" Screen
0x0B : Monster battle
0x0D : CPU's turn in duel
0x10 : Character Viewer menu
0x11 : Credits screen
0x12 : Sound Test
C437 1 Current WRAM Bank
C438 1 Sound Effect playing ?
C439 1 ?
C43B 1 ?
C43C 1 ?
C43D 1 Music playing ?
C441 1 Music loop flag
C500 160 Card Illustration colors
C5A0 1 ?
C5A1 1 ?
C5A2 1 ?
C5A3 1 ? (related to Game Link)
0x00 : ?
0x02 : ?
0x04 : ?
C5A4 1 ? (related to Game Link)
C5A5 1 ? (related to Game Link)
C5A6 1 ? (related to Game Link)
C5A7 1 Button pressed
0x00 : None
0x01 : A
0x02 : B
0x04 : Select
0x08 : Start
0x10 : →
0x20 : ←
0x40 : ↑
0x80 : ↓
C5A8 1 ?
C5AA 1 ? (related to Joypad ?)
C5AC 1 Indicates the game is loading graphics
C5AD 1 Stores offset to the WRAM display array at (C100)
C5AE 1 ? (Seems to be related to Battle Display)
C5AF 1 OAM pointer offset
The pointer at 0x536 + (C5AF) determines where to jump from function 0:0524 (OAM subroutine)
C5B2 1 ? (Related to display)
C5B3 1 ? (Related to display)
C5B5 2 ?
C5B7 1 ?
C5BA 2 Construction part ID
C5BE 2 ? (Card ID to be summoned ?)
C5C0 1 ?
C5C1 1 ?
C5C6 1 ?
C5C7 2 Player's Life Points
C5C9 1 ? (Player) (Initialized to 0 at start of duel, when Life Points are initialized to 8000)
C5CA 2 CPU's Life Points
C5CC 1 ? (CPU) (Initialized to 0 at start of duel, when Life Points are initialized to 8000)
C5CD 2 Stores duel-related values
C5CF 1 ? (Related to text boxes ?)
C5D0 16 Next character string to display
C5E4 1 ? (Related to card names ?)
C5E5 1 ? (Related to Player's Name)
C5E6 1 ? (Related to Player's Name)
C5E7 1 ? (Related to Player's Name)
C5E8 1 Field ID
C5E9 2 Current Card ID being incremented (Trunk)
C5EC 1 ?
C5ED 1 ?
C5EE 1 ?
C5EF 1 ?
C5F0 1 ?
C5F1 1 ?
C5F2 1 ?
C5F3 2 ?
C5F5 1 Trunk : Current Card order
C5F6 2 Card viewer : cost
Deck viewer : last card ID displayed or last card part ID read
Duel : Player's Life Points (temporary copy)
Trunk : last card quantity (1 byte)
C5F8 1 ?
C5F9 1 ?
C5FC 2 Current Card ID being incremented
C602 1 Current cursor position in Deck viewer
C605 1 Current page in Deck viewer
C607 1 Current card position in Deck
C609 1 Current card position -1 in Deck
C60A 80 Player's deck
C65A 80 CPU's shuffled deck
C6AA 1 CPU's deck size / cards drawn
C6AD 1 ?
C6AE 2 Card currently viewed
C6B0 1 0x03 : Regular card
0x06 : Menus
0x07 : Construction card (outside duels)
0x09 : Construction card (in duels)
C6B1 1 Current Field
C6B2 1 Current Stat Level
C6B3 2 Card currently selected (even by the CPU)
C6B5 1 Current Field Column
C6B6 1 Current Field Row
C6B7 2 Current card ATK
C6B9 2 Current card DEF
C6BB 1 Current card Type
C6BC 1 Current card Cost
C6BD 1 Current card Level
C6BE 1 Current card Alignment
C6BF 1 Current card Effect ID (magic trap ritual)
C6C0 1 Current card Effect ID (monster)
C6C1 2 ? (card data ?)
C6C3 2 ? (card data ?)
C6C5 2 ? (card data ?)
C6C7 1 ? (card data ?)
C6EE 1 ?
C6F4 1 ?
C6F5 1 ?
C6F6 1 ?
C6F7 1 ?
C6F8 1 ?
C6F9 1 CPU Character ID displayed
C6FA 1 Text ID displayed
C6FB 1 ?
C6FC 1 ?
C6FD 1 ?
C6FE 1 ?
C700 1 Column to check
C701 1 Row to check
C702 1 Column (Targeted)
C703 1 Row (Targeted)
C704 1 ? (set to 0x01 if (C7C5)&4 ≠ 0, or (C7C5)&8 ≠ 0)
C705 80 Player's shuffled deck
C755 1 Cards drawn during this duel
C759 15 CPU's hand + card status
C768 3 CPU's Trap + card status
C76B 18 CPU's cards on the Field + card status
C780 18 Player's cards on the Field + card status
C78F 3 Player's Trap + card status
C792 15 Player's Hand + cards status
Bit 0: Card position
Bit 1: Is there a card in this zone
Bit 2: Card frozen (more than 1 turn)
Bit 3: Card frozen
Bit 4: Monster Level
Bit 5: Monster Level
Bit 6: Set status
Bit 7: Card stolen for a turn (returns to the opponent at end of turn)
C7A1 1 Field Column
C7A2 1 Field Row
C7A3 3 Card being processed + card status (Card Level, card frozen, Brain Control...)
C7A6 2 Player's Life Points (temporary copy)
C7A8 1 ? (Copied to wC5FB)
C7A9 2 P1 or P2 Life Points (temporary copy)
C7AB 1 ? (Copied to wC5FB)
C7AD 1 ?
C7B0 1 Current turn
0x00: Player 2 or CPU (first turn)
0x01: Player 1
0x02: Player 2 or CPU
C7B1 1 Menu ID (different from C85C)
0x00: Title Screen
0x01: Campaign
0x02: Versus
0x03: Trade
0x04: Duel Records
0x05: Character Viewer
0x06: Construction
0x07: Name entry
0x08: Password
0x09: Sound Test
C7B2 1 Type of damage
0x00 : No Damage
0x04 : Direct Attack vs CPU
0x09 : Spell Damage vs CPU
C7B3 2 Card being processed by the Player
C7B5 2 Card being processed by the CPU
C7B7 1 Monster Alignment (Player)
C7B8 1 Monster Alignment (CPU)
C7B9 2 Player's Life Points (temporary copy)
C7BB 2 CPU's Life Points (temporary copy)
C7BD 2 Monster ATK (Player) and direct damage
C7BF 2 Monster ATK (CPU) and direct damage
C7C1 2 Monster DEF (Player)
C7C3 2 Monster DEF (CPU)
C7C5 1 ? (OR'd with 0x08 when doing more damage than CPU's remaining Life Points)
C7C6 1 ? (related to damage calc)
C7C7 1 ? (related to damage calc)
C7C8 1 ? (related to damage calc)
C7C9 1 ? (related to damage calc)
C7CA 128 ? (Game Link data ?)
C84A 2 ?
C84C 1 ?
C84D 4 Duel: Monster currently selected + copy
Main menu: PRNG
C851 4 Fixed PRNG (for Construction cards mainly)
C855 4 PRNG (copy)
C859 1 Min value possible for Pseudo-Random Number
C85A 1 Max value possible for Pseudo-Random Number
C85B 1 PRN between (C859) and (C85A)
C85C 1 Current selected menu (main menu)
C85D 1 Current Campaign screen
C885 1 ROM Bank for Fusion Data (start)
C886 1 ROM Bank for Fusion Data (end)
C887 2 Fusion Material pointer (start)
C889 2 Fusion Material pointer (end)
C88B 2 Card played by CPU, OR
Monster Card targeted by Equip Card, OR
Fused Monster #1
C88D 2 Card played by Player, OR
Equip Card targeting Monster Card, OR
Fused Monster #2
C88F 2 Fusion Monster ID
C891 2 Player's card ID (temporary copy while attacking)
C893 2 Player's Life Points (temporary copy)
C895 2 P1 or P2 Life Points (temporary copy)
C897 2 Monster ATK (Player) (temporary copy)
C899 2 Monster DEF (Player) (temporary copy)
C89B 1 Monster Alignment (Player) (temporary copy)
C89C 2 CPU's card ID (temporary copy)
C89E 2 CPU's Life Points (temporary copy)
C8A0 2 CPU's Life Points (temporary copy)
C8A2 2 Monster ATK (CPU) (temporary copy)
C8A4 2 Monster DEF (CPU) (temporary copy)
C8A6 1 Monster Alignment (CPU) (temporary copy)
C8A7 1 ? (Battle value)
C8A8 1 ?
C8A9 2 Card being processed (copy)
C8AB 2 Monster to Special Summon (e.g. Spirit of the Book)
Monster to target (e.g. Harpie's Pet Dragon)
C8AD 1 ?
C8AE 1 ?
C8AF 1 ? (Battle value)
C8CC 1 Current CPU opponent
C8CD 1 Pre-Duel music to be played
C8CE 1 Duel music to be played
C8CF 1 ?
C8D0 1 ?
C8D1 1 0x00 : First turn, no attack
0x01 : You can attack
0x02 : Player loses
0x03 : Player wins
C8D2 1 Probably same as (C8D1) but for Link Duels ?
C8D3 1 Stage 2 selected opponent
0x00 : Espa Roba
0x01 : Weevil Underwood
0x02 : Rex Raptor
0x03 : Rare Hunter
0x04 : Pandora
0x05 : Seto Kaiba
C8D6 1 Debug New Game
C8D7 1 ?
C8D8 1 Set to 01 when a New Game is started
C8D9 1 ?
C8FF 1 Duel : ? (Related to text boxes)
C900 1 Duel : Character to display in text box
C901 2 Duel : ? (Related to text boxes)
C905 1 Duel : Text Box ID
C907 1 ?
C90A 1 Duel : ? (Related to text boxes)
C90C 42 Duel Records (battles)
C93E 42 Duel Records (wins)
C970 1 Stage 1 selected opponent
0x00 : Tristan Taylor
0x01 : Joey Wheeler
0x02 : Mai Valentine
0x03 : Mako Tsunami
0x04 : Yugi Muto
0x32 : Tea
C972 1 ?
C973 1 Stage 3 selected opponent
0x00 : Simon Muran
0x01 : Ishitzu Ishtar
0x02 : Heishin
0x03 : P. Seto
C974 8 Player's Name (copy)
C97C 8 Player's Name
C984 1 ? (related to Player's Name)
C986 4 ? (related to save management)
C98A 1 1st character in Player's name + 5th character in Player's name
C98B 1 2nd character in Player's name + 6th character in Player's name
C98C 1 3rd character in Player's name + 7th character in Player's name
C98D 1 4th character in Player's name + 8th character in Player's name
C997 1 ?
C998 1 ?
C999 1 0x01 : Player no longer affected by Swords of Revealing Light
0x02 : Player's Swords of Revealing Light active (1 turn left)
0x03 : Player's Swords of Revealing Light active (2 turn left)
0x04 : Player's Swords of Revealing Light active (3 turn left)
C99A 1 0x01 : CPU no longer affected by Swords of Revealing Light
0x02 : CPU's Swords of Revealing Light active (1 turn left)
0x03 : CPU's Swords of Revealing Light active (2 turn left)
0x04 : CPU's Swords of Revealing Light active (3 turn left)
C99B 1 ? (00'd when a special text is requested from character ≥ 0xB5)
C99C 1 Special text pointer offset
C9B8 8 Card Color data
CA38 1 ?
CA3A 1 Debug Character Viewer - Character ID
CA44 1 Did the player play a monster this turn ?
CA47 2 ?
CAC7 1 ?
CAC8 2 ? (Scroll X / Y ?)
CAD2 1 Debug Sound Test
01 : Music
02 : Sound Effect
CAD3 1 Debug Sound Test - Music ID
CAD4 1 Debug Sound Test - Sound Effect ID
CAD5 1 Numbers of monsters Tributes this turn
CAD6 2 Card being processed (temporary copy)
CADA 1 Column being processed (temporary copy)
CADB 1 Row being processed (temporary copy)
CF8B 36 Stack (push / pop)
CFBC 8 Password - Entered password
CFC4 8 Password - Card password
CFC4 1 Duel - ?
CFC5 1 Duel - Previous ROM Bank (used after rst 08)
CFC6 2 Duel - Previous Program Counter (used after rst 08)
CFCF 1 Password - Valid password flag
CFD0 2 Password - Card ID being checked
CFD2 1 Password - "Is this OK?" textbox
00 - B returns to main menu
01 - B returns to password input
CFD2 1 Password - "Is this OK?" textbox
00 - YES
01 - NO
D001 2 AI - ?
D005 1 AI - ?
D006 2 AI - ?
D05F 2 AI - Can the CPU attack ?
D067 1 AI - Is there a Trap card on the opponent's field ?
D472 15 AI - CPU's hand
D4BA 2 AI - CPU's Life Points
D4BC 2 AI - Player's Life Points
D4BE 1 AI - Field ID
D4BF 1 AI - Player's SoRL
D4C0 1 AI - CPU's SoRL
D4C1 1 AI - (C997)
D4C2 2 AI - ?
D4C5 2 AI - CPU's card ATK
D4C7 1 AI - ?
D4CA 1 AI - Column (current)
D4CB 1 AI - Row (current)
D4CE 1 AI - ?
D4D5 1 AI - Effect triggered
0x01 : Field ?
0x05 : Healing
0x06 : Direct Damage ?
0x07 : ?
0x08 : ?
0x09 : ?
0x0A : Special Summon ?
0x0C : ?
0x0D : ?
0x0E : ?
0x0F : ?
D4D6 1 AI - Column to check
D4D7 1 AI - Row to check
D4DE 1 AI - ?
D4F3 1 AI - ?
D4F4 1 AI - Field ID
D4F5 1 AI - ?
D4F6 2 AI - ?
D4F8 2 AI - Direct Damage or Healing
D4FA 1 AI - ?
D4FD 2 AI - Attack Phase : Player's Monster ID
D4FF 2 AI - Attack Phase : Player's Life Points
D501 2 AI - Attack Phase : Player's Life Points
D503 2 AI - Attack Phase : Player's Monster ATK
D505 2 AI - Attack Phase : Player's Monster DEF
D507 1 AI - Attack Phase : Player's Monster Alignment
D508 2 AI - Attack Phase : CPU's Monster ID
D50A 2 AI - Attack Phase : CPU's Life Points
D50C 2 AI - Attack Phase : CPU's Life Points
D50E 2 AI - Attack Phase : CPU's Monster ATK
D510 2 AI - Attack Phase : CPU's Monster DEF
D512 1 AI - Attack Phase : CPU's Monster Alignment
2:D000 1000 Cards in chest
2:D3E8 280 Card Construction parts
2:D500 400 Constructed cards in Chest
6:D04A 8 Card Levels display
HRAM
Address Size Description
------- ---- -----------
FF80 2 ?
FF82 2 ?
FFD9 2 Deck Capacity (HRAM)
FFDB 1 Grandpa flag ?
0x80 - Grandpa gives a card
FFDC 1 Flag ?
FFDD 1 System running the game
0x01 - Game Boy / Super Game Boy 1
0x11 - Game Boy Color
FFE0 5 ?
Internal Data for Yu-Gi-Oh! Dark Duel Stories
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