The Legend of Zelda/RAM map

The following article is a RAM map for The Legend of Zelda.

The corresponding ROM Map.

Zero Page	Function	Details
0x0000	Multiple Functions: X-coords of sprite, ...
0x0001	Multiple Functions: Y-coords of sprite, ...
0x0002	Multiple Functions: Tile # for sprite (left half), ...
0x0003	Multiple Functions: Tile # for sprite (right half), ...
0x0004	Multiple Functions: Attributes for sprite (left half), ...
0x0005	Multiple Functions: Attributes for sprite (right half), ...
0x0006	?
0x0007	?
0x0008	?
0x0009	?
0x000A	?
0x000B	?
0x000C	?
0x000D	?
0x000E	?
0x000F	?
0x0010	Current Level Index
0x0011	?
0x0012	Game Mode	0 = Title/transitory; 1 = Selection Screen; 5=Normal; 6=Preparing Scroll; 7=Scrolling; 4=Finishing Scroll; E = Registration; F = Elimination
0x0013	?
0x0014	?
0x0015	?
0x0016	Current save slot	$00=first, $01=second, $02=third; On selection/registration/elimination screens: $03=fourth option, $04=fifth option
0x0017	?
0x0018	?
0x0019	?
0x001A	?
0x001B	?
0x001C	?
0x001D	?
0x001E	?
0x001F	?
0x0020	?
0x0021	?
0x0022	?
0x0023	?
0x0024	?
0x0025	?
0x0026	?
0x0027	?
0x0028	?
0x0029	?
0x002A	?
0x002B	?
0x002C	?
0x002D	?
0x002E	?
0x002F	?
0x0030	?
0x0031	?
0x0032	?
0x0033	?
0x0034	?
0x0035	?
0x0036	?
0x0037	?
0x0038	?
0x0039	?
0x003A	?
0x003B	?
0x003C	?
0x003D	?
0x003E	?
0x003F	?
0x0040	?
0x0041	?
0x0042	?
0x0043	?
0x0044	?
0x0045	?
0x0046	?
0x0047	?
0x0048	?
0x0049	?
0x004A	?
0x004B	?
0x004C	Countdown until Link can use his sword again after touching a White Bubble
0x004D	?
0x004E	?
0x004F	?
0x0050	?
0x0051	?
0x0052	?
0x0053	?
0x0054	?
0x0055	?
0x0056	?
0x0057	?
0x0058	?
0x0059	?
0x005A	?
0x005B	?
0x005C	?
0x005D	?
0x005E	?
0x005F	?
0x0060	?
0x0061	?
0x0062	?
0x0063	?
0x0064	?
0x0065	?
0x0066	ROM Offset for start of current Song Data (low byte)
0x0067	ROM Offset for start of current Song Data (high byte)
0x0068	?
0x0069	?
0x006A	Pulse-2 Channel Frequency Offset
0x006B	Pulse-1 Channel Frequency Offset
0x006C	Offset related to Music Pointers
0x006D	?
0x006E	?
0x006F	?
0x0070	Link's X-position on the screen
0x0071	Enemy #1's X-position	Also used for dropped enemy item
0x0072	Enemy #2's X-position	Also used for dropped enemy item?
0x0073	Enemy #3's X-position	Also used for dropped enemy item?
0x0074	Enemy #4's X-position	Also used for dropped enemy item
0x0075	Enemy #5's X-position	Also used for dropped enemy item?
0x0076	Enemy #6's X-position	Also used for dropped enemy item?
0x0077	Enemy #7's X-position	Also used for dropped enemy item?
0x0078	Enemy #8's X-position	Also used for dropped enemy item?
0x0079	Projectile X-position
0x007A	Projectile X-position
0x007B	Projectile #1's X-position
0x007C	?
0x007D	?
0x007E	Link's Sword X-position
0x007F	Boomerang/Bait X-position
0x0080	?
0x0081	?
0x0082	Link's Arrow X-position
0x0083	?
0x0084	Link's Y-position on the screen
0x0085	Enemy #1's Y-position	Also used for dropped enemy item?
0x0086	Enemy #2's Y-position	Also used for dropped enemy item?
0x0087	Enemy #3's Y-position	Also used for dropped enemy item?
0x0088	Enemy #4's Y-position	Also used for dropped enemy item
0x0089	Enemy #5's Y-position	Also used for dropped enemy item?
0x008A	Enemy #6's Y-position	Also used for dropped enemy item?
0x008B	Enemy #7's Y-position	Also used for dropped enemy item?
0x008C	Enemy #8's Y-position	Also used for dropped enemy item?
0x008D	Projectile Y-position
0x008E	Projectile Y-position
0x008F	Projectile #1's Y-position
0x0090	?
0x0091	?
0x0092	Link's Sword Y-position
0x0093	Boomerang/Bait Y Position
0x0094	?
0x0095	?
0x0096	Link's Arrow Y-position
0x0097	Dungeon Floor Item
0x0098	The direction Link is facing	$08=North, $04=South, $01=East, $02=West
0x0099	?
0x009A	?
0x009B	?
0x009C	?
0x009D	?
0x009E	?
0x009F	?
0x00A0	?
0x00A1	?
0x00A2	?
0x00A3	?
0x00A4	?
0x00A5	?
0x00A6	?
0x00A7	?
0x00A8	?
0x00A9	?
0x00AA	?
0x00AB	Type of item in screen	The value indicates item type (bomb, heart, rupee, etc)
0x00AC	?
0x00AD	Type of dropped enemy item #1
0x00AE	Type of dropped enemy item #2?
0x00AF	Type of dropped enemy item #3
0x00B0	Type of dropped enemy item #4
0x00B1	Type of dropped enemy item #5?
0x00B2	Type of dropped enemy item #6?
0x00B3	Type of dropped enemy item #7?
0x00B4	Type of dropped enemy item #8?
0x00B5	Projectile Onscreen?
0x00B6	Projectile Onscreen?
0x00B7	Projectile Onscreen?
0x00B8	?
0x00B9	?
0x00BA	?
0x00BB	?
0x00BC	?
0x00BD	?
0x00BE	?
0x00BF	?
0x00C0	?
0x00C1	?
0x00C2	Dropped Enemy Item
0x00C3	Dropped Enemy Item
0x00C4	?
0x00C5	?
0x00C6	?
0x00C7	?
0x00C8	?
0x00C9	?
0x00CA	?
0x00CB	?
0x00CC	?
0x00CD	?
0x00CE	?
0x00CF	?
0x00D0	?
0x00D1	?
0x00D2	?
0x00D3	?
0x00D4	?
0x00D5	?
0x00D6	?
0x00D7	?
0x00D8	?
0x00D9	?
0x00DA	?
0x00DB	?
0x00DC	?
0x00DD	?
0x00DE	?
0x00DF	?
0x00E0	Game Paused?	$=No, $01=Yes
0x00E1	?
0x00E2	?
0x00E3	?
0x00E4	?
0x00E5	?
0x00E6	?
0x00E7	?
0x00E8	Screen Scrolling?	$00=No, $08=Northbound, $04=Southbound, $01=Eastbound, $02=Westbound
0x00E9	?
0x00EA	?
0x00EB	Current map location	Value equals map x location + 0x10 * map y location
0x00EC	?
0x00ED	?
0x00EE	?
0x00EF	?
0x00F0	?
0x00F1	?
0x00F2	?
0x00F3	?
0x00F4	?
0x00F5	?
0x00F6	?
0x00F7	?
0x00F8	Player 1 Buttons (Last Frame)	R = 1, L = 2, D = 4, U = 8, Start = 10, Select = 20, B = 40, A = 80
0x00F9	Player 2 Buttons (Last Frame)	(See above)
0x00FA	Player 1 Buttons Pressed	$00=No, $08=Up, $04=Down, $01=Right, $02=Left $80=A, $40=B, $20=Select, $10=Start (these can be combined)
0x00FB	Player 2 Buttons Pressed	(See above)
0x00FC	Subscreen Y-scroll position	Used for storyboard text and subscreen position
0x00FD	Subscreen X-scroll position	This is always zero when not scrolling.
0x00FE	?
0x00FF	?

RAM	Function	Details
0x04CD	The entry from ROM:0x18680 for the current room	Overworld: stair placement, quest secrets, Link's V placement, monster entry
0x0513	Whether Link has used the candle on the current screen	$00=No, $01=Yes
0x0526	Overworld room to return to when exiting the underworld
0x052E	Red Bubble Sword Disable switch	$01 if Link's use of his sword has been disabled by a red bubble, $00 otherwise.
0x052F	Maze counter used for rooms 0x61 (forest maze) and 0x1B (mountain room south of level 5)
0x05F0	Related to current frequency being played by Triangle channel
0x05F1	Reverb on/off status for Triangle on current song
0x05F4	Rhythm table pointer for current song
0x0605	Related to incidental music?
0x0606	Sound Effects
0x0607	Incidental Music
0x0609	Songtype currently active	$80=Title, $40=Dungeon, $20=Level 9, $10=Ending, $08=Item, $04=Triforce, $02=Ganon, $01=Overworld
0x060A	Current position within Pulse 2 part (with respect to overall music program)
0x060B	Current position within Pulse 1 part (with respect to overall music program)
0x060C	Current position within Triangle part (with respect to overall music program)
0x060D	Current position within Noise part (with respect to overall music program)
0x060E	?
0x060F	Current cycle duration for notes played on Pulse 1 channel	Uses value from rhythm lookup table
0x0610	Current cycle duration for notes played on Pulse 2 channel	Uses value from rhythm lookup table
0x0611	Countdown from Pulse 2's current rhythm offset	Uses value from rhythm lookup table
0x0612	Pulse 2 countdown; volume fade
0x0613	Countdown from Pulse 1's current rhythm offset	Uses value from rhythm lookup table
0x0614	Pulse 1 countdown; volume fade
0x0615	Current cycle duration for notes played on Triangle channel	Uses value from rhythm lookup table
0x0616	Countdown from value in $615 until next note is to be played
0x0617	?
0x0618	Related to incidental music
0x0619	Reverb on/off status for BOTH Pulse channels on current song	$80=on, $01=off
0x061A	?
0x061B	Countup to Pulse 2 rhythm offset
0x061C	Countup to Pulse 1 rhythm offset
0x061D	??? (seems to count upward as $616 counts down)	Value is always [$615] - [$616] + 1.
0x061E	Number of repeats remaining if in Triangle repeat cycle
0x061F	Position within song program of current Triangle repeat coda (return point)
0x0620	Screen history write index	Contains the index of the next screen history slot to write to (see below)
0x0621	Screen history 1	One of five recently visited map locations
0x0622	Screen history 2	One of five recently visited map locations
0x0623	Screen history 3	One of five recently visited map locations
0x0624	Screen history 4	One of five recently visited map locations
0x0625	Screen history 5	One of five recently visited map locations
0x0626	?
0x0627	Killed enemy count	Number of killed enemies in current screen
0x0628	Unused
0x0629	Unused
0x062A	Unused
0x062B	Unused
0x062C	Unused
0x062D	Current quest for first save slot	$00=First, $01=Second
0x062E	Current quest for second save slot	$00=First, $01=Second
0x062F	Current quest for third save slot	$00=First, $01=Second
0x0630	Number of deaths for first save slot
0x0631	Number of deaths for second save slot
0x0632	Number of deaths for third save slot
0x0656	Cursor position for selecting Link's B item
0x0657	Current sword	$00=None, $01=Sword, $02=White Sword, $03=Magical Sword
0x0658	Number of Bombs
0x0659	Arrow status	$00=None, $01=Arrow, $02=Silver Arrow
0x065A	Bow in Inventory	$00=False, $01=True
0x065B	Status of candle	00=None, $01=Blue Candle, $02=Red Candle
0x065C	Whistle in Inventory	$00=False, $01=True
0x065D	Food in Inventory	$00=False, $01=True
0x065E	Potion in Inventory	$00=None/Letter, $01=Life Potion, $02=2nd Potion
0x065F	Magical Rod in Inventory	$00=False, $01=True
0x0660	Raft in Inventory	$00=False, $01=True
0x0661	Magic Book in Inventory	$00=False, $01=True
0x0662	Ring in Inventory	$00-None, $01-Blue Ring, $02-Red Ring. Note: Changing this value will not change Link's color.
0x0663	Step Ladder in Inventory	$00=False, $01=True
0x0664	Magical Key in Inventory	$00=False, $01=True
0x0665	Power Bracelet in Invenotry	$00=False, $01=True
0x0666	Letter in Inventory	$00=False, $01=True, Link can buy potions from the old woman if $02.
0x0667	Compass status for Levels 1 through 8	When value is converted to binary, a $01 represents having the Compass and a $00 represents not having it.
0x0668	Map status for Levels 1 through 8	When value is converted to binary, a $01 represents having the Map and a $00 represents not having it.
0x0669	Level 9 Compass possessed	$00=False, $01=True
0x066A	Level 9 Map possessed	$00=False, $01=True
0x066C	Clock possessed	$00=False, $01=True
0x066D	Number of Rupees
0x066E	Number of Keys
0x066F	Heart Containers	Low Nibble = how many hearts are filled. High Nybble = Number of heart containers - 1 Ex: $10 = 2 Heart Containers with none filled
0x0670	The heart following the last filled heart	$00 = empty, $01 to $7F = half full, $80 to $FF = full.
0x0671	Triforce pieces	When value is converted to binary, a $01 represents having the piece and a $00 represents not having it. See this image for a visualization.
0x0674	Boomerang in Inventory	$00=False, $01=True. Note: 0x0675 overrides this variable.
0x0675	Magical Boomerang in Inventory	$00=False, $01=True.
0x0676	Magic Shield in Inventory	$00=False, $01=True.
0x067C	Maximum number of bombs	Starts out as $08.
0x067D	Number of rupees to add
0x067E	Number of rupees to subtract
0x6804	Link's tunic color	$29 = green, $32 = blue, $16 = red
0x6B92	Link's tunic color. Overwritten with 0x6804 when Link exits a cave or enters or exits a level
0xA014	Name table drawing macro offset	Pointer to a macro that writes name table data to PPU memory