The Legend of Zelda (NES) - RAM
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Memory Addresses
0000 - Memory offset processing 0001 - Memory offset processing 0002 - ? 0003 - ? 0004 - Memory offset processing 0005 - Memory offset processing 0006 - ? 0007 - Sprite width processing / amount to damage enemy 0008 - Sprite width processing 0009 - ? 000A - Sprite width processing 000B - Player movement processing 000C - Processing sprite's rotation / map loading 000D - Processing sprite's frame 000E - Processing sprite's graphic offset 0012 - Game State (00 - Title, 01 - Player Select, 02 - Change Between over world and underworld, 03 - Camera Wipe, 04 - Stairs Out, 05 - Normal, 06 - Prepare to Scroll Between Rooms, 07 - Scrolling, 0A - Leaving Grotto, 0B - Grotto, 0E - Elimination, 0F - Registration, 10 - Stairs In) 0029 - Gannon Stun Duration (00-3F) 0050 - Enemy Tally (00-0A) (Reset when you get hit or kill an enemy that can drop items) 0058 - Map Loading when moving north/south in rooms 0059 - Something to do with number of sprites on the screen 005B - Memory offset when entering a room 006A - Written to by sound engine 006B - Written to by sound engine Sprite X Positions - some overlap between player objects and enemy objects 0070 - Link X Position 0071-007B - Enemy X Positions 007C - Left Screen Wipe Position 007D - Sword X Position / Right Screen Wipe Position 007E - Sword/Rod Bolt X Position 007F - Boomerang/Bait X Position 0080 - Fire 1 / Bomb X Position 0081 - Fire 2 X Position 0082 - Rod/Arrow X Position 0083 - Dungeon Item X Position Sprite Y Positions - some overlap between player objects and enemy objects 0084 - Link Y Position 0085-008F - Enemy Y Position 0090 - 0091 - Sword Y Position 0092 - Sword/Rod Bolt Y Position 0093 - Boomerang/Bait Y Position 0094 - Fire 1 / Bomb Y Position 0095 - Fire 2 Y Position 0096 - Rod/Arrow Y Position 0097 - Dungeon Item Y Screen Position Direction Values 0098-00A3 - Object Direction (01 - Right, 02 - Left, 04 - Down, 08 - Up) Used by Link, monsters, weapons, etc. 00AC - Link Status Flag (40 - Paralyzed) 00AD - Gannon - Arrow Vulnerability Duration (00-FF) Flashes below 2F 00AE-00B7 - Projectile Flags (Stepladder counts as a projectile) 00B9 - Link's sword status. 00BA - Rod bolt/Sword bolt status (10 - sword, 11 - sword exploding, 80 - rod) 00BB - Boomerang/Bait status (Boomerang 10-17, 50-57 (10 throwing, 50 returning, lo nybble is frame), Bait 80-82 (lo nybble is timeout)) 00BC - Bomb/Flame 1 Status (12 - Bomb Laid, 13 - Bomb big smoke, 14 - Bomb little smoke, 21 - Flame Moving, 22 - Flame Still) 00BD - Flame 2 Status (21 - Flame Moving, 22 - Flame Still) 00BE - Rod/Arrow Status (10 - Arrow, 31-35 - Rod) 00BF - Dungeon Item Status (00 - Used, FF - Not used)) 00E0 - Pause Flag (00 - No, 01 - Yes) 00E3 - Flag for drawing the map while scrolling rooms 00E6 - Flips between 01 and 00 as you change rooms 00E7 - Room change direction (01 - Right, 02 - Left, 04 - Down, 08 - Up) 00E8 - Room scrolling counter - left/right 00E9 - Room scrolling counter - up/down. Also timeout before changing rooms (15-00) - If you alter 82E5 to 00, you will see the room before it's drawn 00EB - Room You're In (00-7F). High nybble is row, low nybble is column. In dungeons, the offset is based on the furthest most top and left room. Also cave exit room. 00EC - Room You're Going To (00-7F) 00ED - Room scrolling counter up/down (counts differently than 00FD) 00EE - Direction you entered this room from (01 - Right, 02 - Left, 04 - Down, 08 - Up) 00F3 - Unknown flag, set to 01 while scrolling rooms 00F8 - Controller 1 Press 00F9 - Controller 2 Press 00FA - Controller 1 Down 00FB - Controller 2 Down 00FC - 00FD - Room scrolling counter - left/right 00FE - 1E normally, 00 when entering caves/dungeons 00FF - Affected by room scrolling 0100-01FF - Stack 0200-02FF - PPU memory 0300-0324 - Screen drawing Info 0325-032A - Updated when screen finished being drawn 0330-0334 - Updated when wiping the screen. 0340 - Counter on which sprites are processed (00-0B) 0341-0344 - Onscreen animated sprite info (flashing rupees, flames, blinking hearts, etc.) 0346-034A - Numbers set to specific values when you enter a room. Same values whether you're in an overworld or underworld room 034C - Number of enemy projectiles on screen 034D - Endless increment when you're in underworld entrance room 034E - Number of maximum enemies in the current room 034F - Number of enemies killed in the current room 0350-035E - Object Type (See Object List) 035F - Unknown room value 0387-038A - Direction of blocked projectiles? 0394 - Link Delta 0395-03A7 - Object Deltas (not all enemies use this) 03A8 - Link Movement Flag 03A9-03BB - Object Movement Flags 03BC - Link Unknown 03BD-03CF - Object Unknowns 03D0 - Link Animation Counter 03D1-03E3 - Enemy Animation Counters 03E4 - Link Animation Frame 03E5-03F7 - Enemy Animation Frames 03F8 - Link Direction (01 - Right, 02 - Left, 04 - Down, 08 - Up) 03F9-040B - Object Directions (01 - Right, 02 - Left, 04 - Down, 08 - Up) 0407-0410 - Enemy Flags? Spawning? 0411-041A - Enemy Values? 041B-0424 - Enemy Values? 042D-0436 - Enemy Animation Frame 0440-0444 - Enemy Values? (set to 4 or 8 with some projectiles) 0445-044A - Enemy Values? (used by Tektities and money making game. Regardless of the grotto type, money making game values are calculated as 0A - -10, 14 - +20, 28 - -40, 32 - +50) 0452-045B - Enemy Delay to Shoot 045A-045C - Enemy Projectile X Delta 045F - Position when writing text 0467-046A - Enemy Projectile Y Delta 0479-0482 - Enemy Pattern Count 0485-0490 - Enemy Hit Points (includes bosses), uses high nybble. 0494-049D - Enemy Flags? 049E-04A7 - Enemy Flags? 04BF-04CB - Enemy Graphic Info 04CC - Room Flags 10 - Fires shoot Link (because he hit old man) 04CD - Room Type (different values for underworld and overworld. Overworld is very confusing!) +01 - Overworld: +02 - Overworld: Shortcut? +04 - Overworld: Burnable Bush +08 - Overworld: Enemies Enter From the Sides (verified) +10 - Overworld: +20 - Overworld: +40 - Overworld: Bombable Cave (Not always used) +80 - Overworld: ? +01 - Underworld: Killing all enemies opens all shuttered doors +02 - Underworld: Room has ringleader +04 - Underworld: Has a pushable block that opens shuttered door +05 - Underworld: Has a pushable block that reveals a secret stairway +07 - Underworld: Room has item after killing all monsters and all shuttered doors are opened +10 - Underworld: Killing all enemies opens specific shuttered door? +20 - Underworld: Item already visible? +30 - Underworld: Triforce room 04E4 - Get set to different values when link leaves a room and reset to 0 when the scrolling ends. 04E8-04EB - Statue Bolt Timeouts 04F0 - Link Invulnerable Timeout (Palette dependent on value) 04F1-04FC - Enemy Invulnerable Timeouts 0505 - Item Holding Up (See Item List) 0506 - Item Holding Up Timeout 0513 - Used Candle Flag (00 - No, 01 - Yes) 0514 - Zora is Up flag (00 - No, 01 - Yes) 0521 - Gets set to different values when link leaves a room and reset to 0 when the scrolling ends. 0524 - Cycles through numbers each time you enter a room. 0526 - Overworld Return Room (FF - None, otherwise, the room you will return to when leaving the underworld) 052A - Enemies Killed Counter (00-09) 052E - Red Bubble Flag (00 - No, 01 - Yes) 052F - Lost Mountains / Lost Woods Counter (00-03) 0530-055F - Screen Tile Attributes 0560-05DF - Number of enemies killed in each dungeon room (set when you leave the room), becomes 0F when all enemies are killed (matches up with full underworld map 1 or 2, see Maps) 05F0-061F - Audio variables 0605 - Link's Action Flag 2 00 - Nothing 04 - Rod 10 - Displaying Text 0606 - Link's Action Flag 2 00 - Nothing 01 - Sword Attack 02 - Boomerang / Arrow 04 - Candle 08 - Entering/Exiting Cave 0607 - Link's Action Flag 3 00 - Nothing 10 - Whistle 0620 - Room History Offset (The offset we're on in the history list) 0621-0626 - Room History (Stores the last six rooms you've been in) 0627 - Number of enemies you've killed since last hit (used for awarding bombs) 0628-062C - Unused? 062D - Second Quest Flag - Slot 1 (00 - First Quest, 01 - Second Quest) 062E - Second Quest Flag - Slot 2 062F - Second Quest Flag - Slot 3 0630 - Death Counter - Slot 1 0631 - Death Counter - Slot 2 0632 - Death Counter - Slot 3 0633 - Player Is Active Flag - Slot 1 0634 - Player Is Active Flag - Slot 2 0635 - Player Is Active Flag - Slot 3 0636 - Register Your Name Flag (00 - No slots available, 01 - Slots available) 0637 - Elimination Mode Flag (00 - No slots used, 01 - Slots used) 0638-063F - Player Name - Slot 1 0640-0647 - Player Name - Slot 2 0648-064F - Player Name - Slot 3 0650 - Heart Info (1/2) - Slot 1 (See 066F/0670 for how these work) 0651 - Heart Info (2/2) - Slot 1 0652 - Heart Info (1/2) - Slot 2 0653 - Heart Info (2/2) - Slot 2 0654 - Heart Info (1/2) - Slot 3 0655 - Heart Info (2/2) - Slot 3 0656 - Currently Selected Item 00 - Boomerang or Empty 01 - Bomb 02 - Arrow 03 - Bow 04 - Candle 05 - Flute 06 - Bait 07 - Medicine 08 - Rod 09 - Raft (Crash if you use) 0A - Book (Crash if you use) 0B - Ring (Crash if you use) 0C - Ladder (Crash if you use) 0D - Magic Key (Crash if you use) 0E - Bracelet (Changes last palette group if you use) 0F - ? 0657 - Sword 00 - None 01 - Wooden 02 - White 03 - Magical 04 - Red/Green Sword 05 - Really weak wood sword 07 - Regular sword using magical sword palette 0658 - Bombs 0659 - Arrow Flag 00 - None 01 - Wooden 02 - Silver 03 - Red 04 - Black 065A - Bow Flag 065B - Candle Flag 00 - None 01 - Blue 02 - Red 03 - Green 04 - Brown 065C - Flute Flag 065D - Bait Flag 065E - Medicine Flag 00 - None 01 - Blue 02 - Red 03 - Black 04 - Green 065F - Magical Rod Flag 0660 - Raft Flag 0661 - Book Flag 0662 - Ring Flag (Doesn't affect armor or link color) 00 - None 01 - Blue 02 - Red 03 - Brown 04 - Green 0663 - Step Ladder Flag 0664 - Magic Key Flag 0665 - Bracelet Flag 0666 - Letter Flag 0667 - Compass Flag (bit flag) 0668 - Map Flag (bit flag) 0669 - Level 9 Compass 066A - Level 9 Map 066B - 066C - Clock Flag 066D - Rupees 066E - Keys 066F - Heart Containers (High nybble flag for container (0-F), low nybble flag for full (0-F) 0670 - Hit Points Per Heart (00-FF, becomes a half heart at 7F) 0671 - Triforce Flag (Bit flags) 0672 - Triforce of Power Flag 0673 - 0674 - Boomerang Flag 0675 - Magical Boomerang Flag 00 - No 01 - Yes 02 - Orange 03 - Dark 04 - Mini 0676 - Magic Shield Flag 067C - Maximum Bombs 067D - Rupee Incrementer 067E - Rupee Decrementer 0680-06FF - Number of enemies killed in Overworld rooms 0700-07FE - Underworld Room Statuses (0700-077F matches up with full underworld map 1, 0780-07FE to map 2, see Maps) +01 - West Passage Open (Locked door or bomb wall only) +02 - East Passage Open +04 - South Passage Open +08 - North Passage Open +10 - Room Item Taken +20 - Room Visited +40 - One Enemy Killed +80 - More Than One Enemy Killed (if joined with +40, All enemies killed)
Save Slots
Names 6001-6009 - Slot Name 1 600A-6011 - Slot Name 2 6012-6019 - Slot Name 3 Items - This section is protected by a checksum Slot #1 601A - Sword Type 601B - Bombs 601C - Arrow Type ... Slot #2 6042 - Sword Type 6043 - Bombs 6044 - Arrow Type ... Room Statuses Slot #1 6092-6121 - Killed Overworld Enemies 6122-6221 - Underworld Status Flags Slot #2 Slot #3 Clothes Slot #1 6804 - Link's Tunic Color 6805 - Link's Skin Color 6806 - Link's Belt Color Slot #2 6808 - Link's Tunic Color 6809 - Link's Skin Color 680A - Link's Belt Color Slot #3 680C - Link's Tunic Color 680D - Link's Skin Color 680E - Link's Belt Color
ROM Data
6B81-6BA0 - Game Palettes In-Game Link Attributes 6B92 - Link's Tunic Color 6B93 - Link's Skin Color 6B94 - Link's Belt Color 6BA2 - Starting number of enemies in underworld room type 1 6BA3 - Starting number of enemies in underworld room type 2 6BA4 - Starting number of enemies in underworld room type 3 6BA5 - Starting number of enemies in underworld room type 4
Tables
Item List
01 - Sword 02 - White Sword 03 - Magic Sword 04 - Bait 05 - Recorder 06 - Blue Candle 07 - Red Candle 08 - Arrow 09 - Silver Arrow 0A - Bow 0B - Magic Key 0C - Raft 0D - Step Ladder 0E - Moblin Error 0F - 5 Rupies 10 - Rod 11 - Book 12 - Blue Ring 13 - Red Ring 14 - Bracelet 15 - Letter 16 - Compass 17 - Map 18 - Rupy 19 - Key 1A - Heart Container 1B - Triforce 1C - Magic Shield 1D - Boomerang 1E - Magic Boomerang 1F - Blue Medicine 20 - Red Medicine 21 - Clock 22 - Heart 23 - Fairy (Flying) ? 24 - Fairy (Stationary) ? 25 - Upsidedown Link 26 - Sword (Shooting) 27 - Magic Bolt 28 - Bomb (Item) ? 29 - Bomb (Exploding) ?
Object List
01 - Lynel - Blue 02 - Lynel - Red 03 - Moblin - Blue 04 - Moglin - Red 05 - Goryia - Blue 06 - Goryia - Red 07 - Octorok - Red 08 - Fast Octorok - Red 09 - Octorok - Blue 0A - Fast Octorok - Blue 0B - Darknut - Red 0C - Darknut - Blue 0D - Tektite - Blue 0E - Tektite - Red 0F - Leever - Blue 10 - Leever - Red 11 - Zora 12 - Vire 13 - Zol 14 - Gel - Slow 15 - Gel - Fast 16 - Pols Voice 17 - Like-Like 18 - Digdogger - Small 19 - ? 1A - Peahat 1B - Keese - Blue 1C - Keese - Red 1D - Keese - Black 1E - Armos - Fast & Slow 1F - Rock Spawner 20 - Falling Rock 21 - Ghini 22 - Ghini - Summoned 23 - Wizzrobe - Blue 24 - Wizzrobe - Red 25 - Patra Eyes - Spiral 26 - Patra Eyes - Expanding 27 - Wallmaster 28 - Rope / Flashing Rope 29 - ? 2A - Stalfos / Stalfos - Shooting 2B - Bubble 2C - Bubble - Blue 2D - Bubble - Red 2E - Whistle Whirlwind 2F - Fairy In Pond 30 - Gibdo 31 - Dodongo - Three 32 - Dodongo - One 33 - Ghoma - Blue 34 - Ghoma - Red 35 - 10 Rupees 36 - Grumble, Grumble 37 - Zelda 38 - Digdogger / Digdogger 3 Spawn 39 - Digdigger - Unused 3A - Lanmola - Red 3B - Lanmola - Blue 3C - Manhandla 3D - Aquamentus 3E - Gannon / Triforce of Power 3F - Fire Blocking Zelda 40 - Fire 41 - Moldorm 42 - Gleeok - 1 Head - Unused ? 43 - Gleeok - 2 Heads 44 - Gleeok - 3 Heads 45 - Gleeok - 4 Heads 46 - Gleeok Head 47 - Patra - Spiral 48 - Patra - Expanding 49 - Trap 4A - Killable Trap (Unused) 4B - Old Man - Dungeon Clue 1 - These 8 include 4C - Old Man - Dungeon Clue 2 - More Bombs 4D - Old Man - Dungeon Clue 3 - And Leave Your 4E - Old Man - Dungeon Clue 4 - Money Or Life 4F - Old Man - Dungeon Clue 5 50 - Old Man - Dungeon Clue 6 51 - Old Man - Dungeon Clue 7 52 - Old Man - Dungeon Clue 8 53 - Octorok's Rock 54 - ? Bolt (Glitched) 55 - Zora's Bolt / Statue's Bolt / Fire's Bolt / Aquamentus' Bolt 56 - Gannon's Bolt / Manhandla's Bolt / Gleeok's Bolt 57 - Lynel's Sword, Stalfos Sword 58 - ? Bolt (Glitched) 59 - Wizzrobe's Bolt 5A - ? Bolt (Glitched) 5B - Moblin's Spear 5C - Goriya's Boomerang 5D - Death Explosion 5E - Whistle Makes Stairs Appear 5F - Step Ladder 60 - Heart / Rupee / 5 Rupees / Fairy / Clock 61 - Raft Launch 62 - Pushable Boulder 63 - Bombable Wall 64 - Burnable Bush 65 - Pushable Tombstone 66 - Pushable Armos 67 - ? 68 - Pushable Block 69 - ? 6A - Old Man - Rusty Sword 6B - Old Man - Take Medicine / Heart 6C - Old Man - White Sword 6D - Old Man - Magic Sword 6E - Old Man - Warp 6F - Old Man - Secret Tree At Dead-End 70 - Old Man - Money Making Game 71 - Old Man - Door Repair 72 - Old Man - With Letter 73 - Old Woman - Meet the Old Man At the Grave 74 - Old Woman - Medicine 75 - Old Woman - Pay to Talk (Go Up the Mountain) 76 - Old Woman - Pay to Talk (Go North, West, South, West) 77 - Merchant 1 (130 Shield, 20 Bombs, 80 Arrows) 78 - Merchant 2 (160 Shield, 100 Key, 60 Candle) 79 - Merchant 3 (90 Shield, 100 Bait, 10 Heart) 7A - Merchant 4 (80 Key, 250 Ring, 60 Bait) 7B - Secret to Everybody - 30 7C - Secret to Everybody - 100 7D - Secret to Everybody - 10 7E - Glitched Man 7F - Glitched Man
Code
Damage Enemy
Expected: $0007 - High nybble is amount of damage to deal. X - Hit object's offset. Y - Hitting object's direction offset. 7C3F:C9 0B CMP #$0B 7C41:F0 04 BEQ $7C47 7C43:C9 0C CMP #$0C 7C45:D0 0D BNE $7C54 7C47:B9 98 00 LDA $0098,Y ; Load the object's direction. 7C4A:15 98 ORA $98,X 7C4C:C9 0C CMP #$0C 7C4E:F0 19 BEQ $7C69 7C50:C9 03 CMP #$03 7C52:F0 15 BEQ $7C69 7C54:A9 02 LDA #$02 7C56:8D 04 06 STA $0604 7C59:BD 85 04 LDA 0485,X ; Load enemy's hit points into A. 7C5C:C5 07 CMP $0007 ; Check for killing hit. 7C5E:90 16 BCC $7C76 ; If hit will put HP below 0, jump to 7C76 (kill monster). 7C60:38 SEC ; 7C61:E5 07 SBC $0007 ; Subtract damage amount from A. 7C63:9D 85 04 STA 0485,X ; Store modified hit points. 7C66:F0 0E BEQ $7C76 ; If monster's new HP is 0, jump to 7C76 (kill monster). 7C68:60 RTS
Load Room With Enemies
889D:B9 A2 6B LDA $6BA2,Y ; Load from the list of maximum enemies in the rooms. 88A0:A4 02 LDY $0002 88A2:C0 62 CPY #$62 88A4:B0 06 BCS $88AC 88A6:C0 32 CPY #$32 88A8:90 02 BCC $88AC 88AA:A9 01 LDA #$01 88AC:85 03 STA $0003 ; $0003 temporarily houses the number of enemies in the room. 88AE:A5 10 LDA $0010 88B0:D0 06 BNE $88B8 88B2:20 B8 90 JSR $90B8 88B5:4C C7 88 JMP $88C7 88B8:20 9D 92 JSR $929D ...
Famicom Disk System
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Famicom Disk System |
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Famicom Disk System (Rev 1)
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Famicom Disk System (Rev 1) |
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Europe
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Europe |
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Europe (Rev 1)
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Europe (Rev 1) |
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Japan
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Japan |
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USA (GameCube Edition)
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USA (GameCube Edition) |
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USA (Rev 1, GameCube Edition)
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USA (Rev 1, GameCube Edition) |
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USA (Virtual Console)
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USA (Virtual Console) |
USA (Collector's Edition)
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USA (Collector's Edition) |
Famicom Disk System (Beta)
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Famicom Disk System (Beta) |
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Famicom Disk System (GameCube)
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Famicom Disk System (GameCube) |
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Famicom Disk System (Virtual Console)
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Famicom Disk System (Virtual Console) |
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Famicom Disk System (Switch Online)
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Famicom Disk System (Switch Online) |
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Famicom Disk System (Collector's Edition)
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Famicom Disk System (Collector's Edition) |
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Europe (Virtual Console)
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Europe (Virtual Console) |
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