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The Legend of Zelda/RAM map
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The following article is a RAM map for The Legend of Zelda.
Zero Page
Address Function Details
----------- --------------------------- -----------------------------------------
00 Multiple Functions X-coords of sprite, ...
01 Multiple Functions Y-coords of sprite, ...
02 Multiple Functions Tile # for sprite (Left Half), ...
03 Multiple Functions Tile # for sprite (Right Half), ...
04 Multiple Functions Attributes for sprite (Left Half), ...
05 Multiple Functions Attributes for sprite (Right Half), ...
06 ?
07 Multiple Functions
08-0E ?
0F Multiple Functions Link's Move Direction (01,FF), ...
10 Current Level (0 = Overworld)
11 ?
12 Game Mode 0=Title/transitory 1=Selection Screen
5=Normal 6=Preparing Scroll
7=Scrolling 4=Finishing Scroll;
E=Registration F=Elimination
13 Routine Index
14 PPU Loading Index
15 Frame counter
16 Current save slot $00=first, $01=second, $02=third; On selection/registration/elimination screens: $03=fourth option, $04=fifth option
17-23 Individual Randomizer
24-27 ?
28 (X to update $00, ...)
29 Timer/Countdown Used for dialog text and is a Countdown until Enemy #1 can do his action(See Below) again
2A Countdown until Enemy #2 can do his main action(Shoot a Projectile,Jump,etc.)again
2B Countdown until Enemy #3 can do his main action(See Above)again
2C Countdown until Enemy #4 can do his main action(See Above)again
2D Countdown until Enemy #5 can do his main action(See Above)again
2E Countdown until Enemy #6 can do his main action(See Above)again
2F ?
30 Countdown until Rock #1 and Zola's Fireball start to move
31 Countdown until Rock #2 and Zola's Fireball start to move
32 Countdown until Rock #3 and Zola's Fireball start to move and until Zola start his next animation
33 Countdown until Zola start his next animation
34-36 ?
37 Countdown until bait disappears (3 cycle before disappearence)
38 Countdown until bomb explode or flame (Magical Rod or Candle) disappears
39-3B ?
3C Countdown until Link and enemies can move again after the recorder was use
3D-4B ?
4C Countdown until Link can use his sword again after touching a White Bubble
4D-4F ?
50 Counts number of enemies killed without taking damage, resets to 0 once it reaches 10 ("10th enemy has the bomb" RAM address)
51-5B ?
5C Vertical Scrolling Offset (high byte)
5D-65 ?
66 ROM Offset for start of current Song Data (Low Byte)
67 ROM Offset for start of current Song Data (High Byte)
68-69 ?
6A Pulse-2 Channel Frequency Offset
6B Pulse-1 Channel Frequency Offset
6C Offset related to Music Pointers
6D ?
6E Rhythmic Offset For current note of Pulse 2 Incidental Music
6F Rhythmic Countdown For Pulse 2 incidental music (Uses value at $6E)
70 Link's X-position on the screen
71 Enemy #1 X-position Also used for dropped enemy item
72 Enemy #2 X-position Also used for dropped enemy item
73 Enemy #3 X-position Also used for dropped enemy item
74 Enemy #4 X-position Also used for dropped enemy item
75 Enemy #5 X-position Also used for dropped enemy item
76 Enemy #6 X-position Also used for dropped enemy item
77 Enemy #4 Projectile X-position
78 Enemy #1 Projectile X-position
79 Enemy #2 Projectile X-position
7A Enemy #3 Projectile and Zola(On Some Screen) X-position
7B Zola X position (On Some screen )
7C ?
7D Link's Sword X-position (As a Melee Weapon)
7E Link's Sword X-position (As a Projectile)
7F Boomerang/Bait X-position
80 Flame/Bomb #1 X-position
81 Flame/Bomb #2 X-position
82 Link's Arrow X-position
83 ?
84 Link's Y-position on the screen
85 Enemy #1 Y-position Also used for dropped enemy item
86 Enemy #2 Y-position Also used for dropped enemy item
87 Enemy #3 Y-position Also used for dropped enemy item
88 Enemy #4 Y-position Also used for dropped enemy item
89 Enemy #5 Y-position Also used for dropped enemy item
8A Enemy #6 Y-position Also used for dropped enemy item
8B Enemy #4 Projectile Y-position
8C Enemy #1 Projectile Y-position
8D Enemy #2 Projectile Y-position
8E Enemy #3 Projectile and Zola (On Some Screen) Y-position
8F Zola Y-position (On Some Screen)
90 ?
91 Link's Sword Y-position (As a Melee Weapon)
92 Link's Sword Y-position (As a Projectile)
93 Boomerang/Bait Y-position
94 Flame/Bomb #1 Y-position
95 Flame/Bomb #2 Y-position
96 Link's Arrow Y-position
97 Dungeon Floor Item
98 Link's Direction $08=North, $04=South, $01=East, $02=West
99 Enemy #1 Direction (See Above)
9A Enemy #2 Direction (See Above)
9B Enemy #3 Direction (See Above)
9C Enemy #4 Direction (See Above)
9D Enemy #5 Direction (See Above)
9E Enemy #6 Direction (See Above)
9F Enemy #4 Projectile Direction(See Below)
A0 Enemy #1 Projectile Direction $08=North, $04=South, $01=East, $02=West(Diagonal direction are equal to $(Xdirection+Ydirection))
A1 Enemy #2 Projectile Direction (See Above)
A2 Enemy #3 Projectile Direction (See Above)
A3-A4 ?
A5 Link's Sword Direction (As a Melee weapon) $08=North, $04=South, $01=East, $02=West
A6 Link's Sword Direction (As a Projectile)
A7 Boomerang Direction
A8 Flame (Candle or Magic Rod) Direction
A9 ?
AA Arrow and Magic Rod's projectile Direction $08=North, $04=South, $01=East, $02=West
AB Type of item in screen The value indicates item type (Bomb, Heart, Rupee, etc)
AC Link's Animation
AD Type of dropped enemy item #1
AE Type of dropped enemy item #2
AF Type of dropped enemy item #3
B0 Type of dropped enemy item #4
B1 Type of dropped enemy item #5
B2 Type of dropped enemy item #6
B3 State of Enemy #4 Projectile (See Below)
B4 State of Enemy #1 Projectile $00=Not Existant, $10=In Movement, $20=Start of Blowing Animation, $28=End of Blowing Animation, $30=Being Deflected by Shield
B5 State of Enemy #2 Projectile (See Above)
B6 State of Enemy #3 Projectile (See Above)
B7 State of Enemy #? Projectile (See Above)
B8 ?
B9 Link's Sword Animation
BA State of Link's Sword(As a Projectile) and Magic $00=Not Existant, $10=In Movement, $11=Blowing Animation, $80=Magic Onscreen
BB State of Bait and Link's Boomerang $10-$17=Rotation of boomerang when going away, $24=Turnaround of Boomerang, $28=Blowing Animation of Boomerang, $50-$57=Rotation of boomerang when coming back, $80=Bait Onscreen(First cycle of 0x0037), $81=Bait Onscreen(Second cycle of 0x0037), $82 Bait Onscreen(Last cycle of 0x0037)
BC State of Link's Bomb and Flame #1 $12=Bomb Onscreen, $13=Bomb's Smoke Onscreen, $14=Bomb's Smoke Dissappearing, $21=Flame #1 is Moving, $22=Flame #1 is static
BD State of Link's Flame #2 $21=Flame #2 is Moving, $22=Flame #2 is static
BE State of Link's Arrow and Magical rod animation $00=Not Existant, $10=In Movement, $20=Start of Blowing Animation, $28=End of Blowing Animation, $31-$35=Magical Rod Animation
BF-C1 ?
C2 Dropped Enemy Item
C3 Dropped Enemy Item
C4-DF ?
E0 Game Paused? $00=No, $01=Yes
E1 Item Menu Scrolling Animation
E2-E7 ?
E8 Screen Scrolling? $00=No, $08=Northbound, $04=Southbound, $01=Eastbound, $02=Westbound
E9-EA ?
EB Map location Value equals map x location + 0x10 * map y location
EC Next Location
ED-F7 ?
F8 Player 1 Buttons (Last Frame) R = 1, L = 2, D = 4, U = 8, Start = 10, Select = 20, B = 40, A = 80
F9 Player 2 Buttons (Last Frame) (See above)
FA Player 1 Buttons Pressed $08=Up, $04=Down, $01=Right, $02=Left $80=A, $40=B, $20=Select, $10=Start
FB Player 2 Buttons Pressed (See Above)
FC Subscreen Y-scroll position Used for storyboard text and subscreen position
FD Subscreen X-scroll position This is always zero when not scrolling.
FE The PPU mask value is set to the value of this address (it's always $1E). Could have had a purpose in some stage of development to hide sprites, since it is used by the item menu and pause routine (calls a routine that takes the value and AND's it with $FE, which does nothing today, but could have been set to something else back then).
FF ?
RAM
RAM Function Details
------- --------------------------- -----------------------
04CD Screen options The entry from ROM:0x18680 for the current room Overworld: stair placement, quest secrets, Link's V placement, monster entry
0513 Candle used Whether Link has used the candle on the current screen $00=No, $01=Yes
0523 Randomizer
0526 Cave return screen Overworld room to return to when exiting the underworld
052A Enemies Killed (resets after 9)
052E Sword disable Red Bubble Sword Disable switch: $01 if Link's use of his sword has been disabled by a red bubble, $00 otherwise.
052F Maze counter Used for screens 0x61 (forest maze) and 0x1B (mountain room south of level 5)
05F0 Related to current frequency being played by Triangle channel
05F1 Triangle Reverb Reverb on/off status for Triangle on current song
05F4 Rhythm table pointer for current song
0600 Song Trigger Song ID#'s are written here to activate; value is copied over to $609 within a frame. $600 is then zeroed-out.
0602 Pulse 2 I.M. Trigger Incidental Music ID#'s for Pulse 2 are written here; value is copied over to $607 within a frame.
01 = Rupee Taken
02 = Object Appears
04 = Secret Found
08 = Object Taken
10 = Flute Chime
20 = Enemy Killed
40 = Game Over Tune
80 = Link Death
0604 Pulse 1 I.M. Trigger Incidental Music ID#'s for Pulse 1 are written here; value is copied over to $605 within a frame.
0605 Pulse 1 I.M. Type $80=?, $40=1 Heart Warning, $20=Set Bomb, $10=Small Heart Pickup, $08=Key Pickup, $04=Magic Cast, $02=Boomerang Stun, $01=Arrow Deflected
0606 Sound Effects
0607 Pulse 2 I.M. Type $80=Death Spiral, $40=Continue Screen, $20=Enemy Burst, $10=Whistle, $08=Bomb Pickup, $04=Secret Revealed, $02=Key Appears, $01=Rupee Pickup
0609 Songtype currently active $80=Title, $40=Dungeon, $20=Level 9, $10=Ending, $08=Item, $04=Triforce, $02=Ganon, $01=Overworld
060A Pulse 2 pos Current position within Pulse 2 part (with respect to overall music program)
060B Pulse 1 pos Current position within Pulse 1 part (with respect to overall music program)
060C Triangle pos Current position within Triangle part (with respect to overall music program)
060D Noise pos Current position within Noise part (with respect to overall music program)
060E ?
060F Pulse 1 cycle Current cycle duration for notes played on Pulse 1 channel Uses value from rhythm lookup table
0610 Pulse 2 cycle Current cycle duration for notes played on Pulse 2 channel Uses value from rhythm lookup table
0611 Pulse 2 rhythm Countdown from Pulse 2's current rhythm offset Uses value from rhythm lookup table
0612 Pulse 2 countdown volume fade
0613 Pulse 1 rhythem Countdown from Pulse 1's current rhythm offset Uses value from rhythm lookup table
0614 Pulse 1 countdown volume fade
0615 Triangle cycle Current cycle duration for notes played on Triangle channel Uses value from rhythm lookup table
0616 Note countdown Countdown from value in $615 until next note is to be played
0617 ?
0618 Pulse 2 I.M. offset Offset into Pulse 2 Incidental Music data
0619 Pulse reverb Reverb on/off status for BOTH Pulse channels on current song $80=on, $01=off
061A ?
061B Pulse 2 rhythm counter Countup to Pulse 2 rhythm offset
061C Pulse 1 rhythm counter Countup to Pulse 1 rhythm offset
061D ??? (seems to count upward as $616 counts down) Value is always [$615] - [$616] + 1.
061E Triangle repeat counter Number of repeats remaining if in Triangle repeat cycle
061F Triangle Song pos Position within song program of current Triangle repeat coda (return point)
0620 Screen history write index Contains the index of the next screen history slot to write to (see below)
0621 Screen history 1 One of five recently visited map locations
0622 Screen history 2 One of five recently visited map locations
0623 Screen history 3 One of five recently visited map locations
0624 Screen history 4 One of five recently visited map locations
0625 Screen history 5 One of five recently visited map locations
0626 ?
0627 Killed enemy count Number of killed enemies in current screen
0628 Unused
0629 Unused
062A Unused
062B Unused
062C Unused
062D Current quest Save slot 1: $00=First, $01=Second
062E Current quest Save slot 2: $00=First, $01=Second
062F Current quest Save slot 3: $00=First, $01=Second
0630 Number of deaths Save slot 1
0631 Number of deaths Save slot 2
0632 Number of deaths Save slot 3
0633 Slot 1 Present Save Slot 1 present (Cursor will bypass Slot 1 if set to $00)
0634 Slot 2 Present Save Slot 2 present (Cursor will bypass Slot 2 if set to $00)
0635 Slot 3 Present Save Slot 3 present (Cursor will bypass Slot 3 if set to $00)
0636 Register Your Name Present Register Your Name option present (Cursor will bypass "Register Your Name" if set to $00)
0637 Elimination Mode Present Elimination Mode option present (Cursor will bypass "Elimination Mode" if set to $00)
0638 Slot 1 Player name Player Name for Save Slot 1 (8 bytes)
0640 Slot 2 Player name Player Name for Save Slot 2 (8 bytes)
0648 Slot 3 Player name Player Name for Save Slot 3 (8 bytes)
0650 Heart Cont. (File Select) Low Nibble = how many hearts are filled. High Nybble = No. of heart containers - 1
Ex: $22 = 3 Heart Containers with all 3 filled
0651 Fill hearts (File Select) $FF = Full.
0652 Heart Cont. (File Select) Low Nibble = how many hearts are filled. High Nybble = No. of heart containers - 1
Ex: $22 = 3 Heart Containers with all 3 filled
0653 Fill hearts (File Select) $FF = Full.
0654 Heart Cont. (File Select) Low Nibble = how many hearts are filled. High Nybble = No. of heart containers - 1
Ex: $22 = 3 Heart Containers with all 3 filled
0655 Fill hearts (File Select) $FF = Full.
0656 Selected item pos Cursor position for selecting Link's B item
0657 Current sword $00=None, $01=Sword, $02=White Sword, $03=Magical Sword
0658 Number of Bombs
0659 Arrow status $00=None, $01=Arrow, $02=Silver Arrow
065A Bow in Inventory $00=False, $01=True
065B Status of candle $00=None, $01=Blue Candle, $02=Red Candle
065C Whistle in Inventory $00=False, $01=True
065D Food in Inventory $00=False, $01=True
065E Potion in Inventory $00=None/Letter, $01=Life Potion, $02=2nd Potion
065F Magical Rod in Inventory $00=False, $01=True
0660 Raft in Inventory $00=False, $01=True
0661 Magic Book in Inventory $00=False, $01=True
0662 Ring in Inventory $00-None, $01-Blue Ring, $02-Red Ring. Note: Changing this value will not change Link's color.
0663 Step Ladder in Inventory $00=False, $01=True
0664 Magical Key in Inventory $00=False, $01=True
0665 Power Bracelet in Invenotry $00=False, $01=True
0666 Letter in Inventory $00=False, $01=True, Link can buy potions from the old woman if $02.
0667 Compass in Inventory One bit per level
0668 Map in Inventory One bit per level
0669 Compass in Inventory (Level 9)
066A Map in Inventory (Level 9)
066C Clock possessed $00=False, $01=True
066D Number of Rupees
066E Number of Keys
066F Heart Containers Low Nibble = how many hearts are filled. High Nybble = Number of heart containers - 1
Ex: $10 = 2 Heart Containers with none filled
0670 Partial heart $00 = empty, $01 to $7F = half full, $80 to $FF = full.
0671 Triforce pieces One bit per piece
0672 ??? Related to Ganon's Triforce ???
0673 ??? Unused ???
0674 Boomerang in Inventory $00=False, $01=True. Note: 0x0675 overrides this variable.
0675 Magical Boomerang in Inventory
$00=False, $01=True.
0676 Magic Shield in Inventory $00=False, $01=True.
0677-067B ??? Unused ???
067C Maximum number of bombs Starts out as $08.
067D Number of rupees to add
067E Number of rupees to subtract
067F ?? Screen State (Bit 7 = Secret Discovered)
SRAM
RAM Function Details ------- --------------------------- ----------------------- 6000 NameTable Player Name Save #1 600A NameTable Player Name Save #2 6010 NameTable Player Name Save #3 6530 Tile Mapping Codes for Current Screen (B * 2 * 20 = 2C0 bytes) 67F0 ..?? 6804 Link's tunic color $29 = green, $32 = blue, $16 = red 6880 This is used in Game but also for SaveFunction. 6880 SaveStatePlayerOne Name?? 6898 SaveStatePlayerOne Item PRG $A6C6 LDY #$27 TableSize LDA $0657,Y $067E RAM Location STA ($C0),Y $6997 SRAM Location DEY PRG $A7B3 After it will be copied to beginning of SRAM LDY #$07 LDA ($C4),Y $6883 STA ($04),Y $6005 DEY 68C0 ?? 6910-6A8F End of Player one SaveTable?? 6B92 Link's tunic color Overwritten with 0x6804 when Link exits a cave or enters or exits a level 6827 -> 19D0F 134E8
Pointer table for Column Definitions 687E -> 8A00 2182 Screen Attributes - Table 0 68FE -> 8A80 2182 Screen Attributes - Table 1 697E -> 8B00 2182 Screen Attributes - Table 2 69FE -> 8B80 2182 Screen Attributes - Table 3 6A7E -> 8C00 2182 Screen Attributes - Table 4 6AFE -> 8C80 2182 Screen Attributes - Table 5 6BA2 -> Enemy Quantities (4 bytes) 6BA6 -> Link's Starting Vertical Position (Various Data) 6BA7 -> Stairs Positions (4 bytes) 6BAF-6BB0 -> 19331 12782
Offset in Cartridge RAM for Screen Status (Overworld Various Data) 6BB1 Level Number 6C90 -> 6500 790 Code 6D80 -> 65F0 6DC7 -> 6637 6E39 -> 66A9 6E6E -> 66DE 6EF9 -> 6769 6F29 -> 6799 6F73 -> 67E3 700F -> 687F 701F -> 688F 790 728E -> 6AFE 790 Code (called at 16A52) 7314 -> 6B84 790 73AA -> 6C1A 790 7613 -> 6E83 790 Table 7A4A -> 72BA 790 Enemy Damage Table 7E26 -> 7696 790
WRAM
RAM Function Details
------- --------------------------- -----------------------
6804 Link's tunic color $29 = green, $32 = blue, $16 = red
6B92 Link's tunic color Overwritten with 0x6804 when Link exits a cave or enters or exits a level
A014 Name table drawing macro offset
Pointer to a macro that writes name table data to PPU memory
Internal Data for The Legend of Zelda
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