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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 ?
07-0F ?
08
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 ?
14 ?
15 Frame counter
16 Current save slot $00=first, $01=second, $02=third; On selection/registration/elimination screens: $03=fourth option, $04=fifth option
17-28 ?
29 Timer Used for dialog text
2A-4B ?
4C Countdown until Link can use his sword again after touching a White Bubble
4D-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 screen X X Position on 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 7 X-position Also used for dropped enemy item
78 Enemy 8 X-position Also used for dropped enemy item
79 Projectile X-position
7A Projectile X-position
7B Projectile #1's X-position
7C ?
7D ?
7E Link's Sword X-position
7F Boomerang/Bait X-position
80 ?
81 ?
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 7 Y-position Also used for dropped enemy item
8C Enemy 8 Y-position Also used for dropped enemy item
8D Projectile Y-position
8E Projectile Y-position
8F Projectile #1's Y-position
90 ?
91 ?
92 Link's Sword Y-position
93 Boomerang/Bait Y Position
94 ?
95 ?
96 Link's Arrow Y-position
97 Dungeon Floor Item
98 Links direction $08=North, $04=South, $01=East, $02=West
99-AA ?
AB Type of item in screen The value indicates item type (bomb, heart, rupee, etc)
AC ?
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 Type of dropped enemy item #7
B4 Type of dropped enemy item #8
B5 Projectile Onscreen?
B6 Projectile Onscreen?
B7 Projectile Onscreen?
B8-C1 ?
C2 Dropped Enemy Item
C3 Dropped Enemy Item
C4-DF ?
E0 Game Paused? $00=No, $01=Yes
E1-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-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 ?
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
0526 Cave return screen Overworld room to return to when exiting the underworld
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.
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
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
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.
067C Maximum number of bombs Starts out as $08.
067D Number of rupees to add
067E Number of rupees to subtract
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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