The Legend of Zelda: Oracle of Seasons/RAM map

NOTE: All values in Tables are Hexadecimal unless noted otherwise.

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

Bank 0 ($C000 - $CFFF)

TBD

RAM	Length	Purpose	Note
$C5C0 - $C5FF	64 Bytes	Unappraised rings carried
$C602 - $C606	5 Bytes	Player name
$C616 - $C61D	8 Bytes	Rings owned
$C61E - $C61F	2 Bytes	Deaths
$C620 - $C621	2 Bytes	Enemies killed since file creation	When total killed enemies reaches 0x3E8, 0x01 is added to $C6CA to set a flag for Vasu to give the Slayer's Ring, and this no longer increments when killing enemies.
$C622 - $C625	4 Bytes	Time passed since power-on
$C627 - $C628	2 Bytes	Rupees earned since file creation	Value is represented in decimal. Example: If the total earned rupee count is 8,473, the hexadecimal representation will be 0x8473. When a rupee gain pushes the value over 0x9999, the value is then set to 0x6363, the value will no longer change, and $C6CA is then incremented by 0x02 so that Vasu will give the Rupee Ring the next time he is spoken with.
$C629	1 Byte	Message Speed	0x00 - 0x04 Some higher values yield hilarious results such as a letter appearing once per few seconds.
$C63A	1 Byte	Current level bank
$C63B	1 Byte	Current Absolute Overworld Screen OR Current Relative Dungeon Screen	On the overworld, all 256 map tiles are represented in order; left to right, top to bottom, 0x00 - 0xFF. Inside a dungeon, only map tiles that are valid rooms are represented while empty map tiles are not counted; the only empty map tiles that are counted are the ones leading up to the first valid room in order, then from there, the value only increases with each valid room.
$C63C	1 Byte	Current Absolute Dungeon Screen	Unlike with $C63B, all tiles on the dungeon map, including ones that do not represent a valid room, are counted in order; left to right, top to bottom, 0x00 - 0xFF.

Enemies killed since...

RAM	Length	Purpose	Note
$C63E	1 Byte	Last Maple encounter
$C64C	1 Byte	Gasha Seed planted at ??
$C64D	1 Byte	Gasha Seed planted at ??
$C64E	1 Byte	Gasha Seed planted at ??
$C64F	1 Byte	Gasha Seed planted at ??
$C650	1 Byte	Gasha Seed planted at ??
$C651	1 Byte	Gasha Seed planted at ??
$C652	1 Byte	Gasha Seed planted at ??
$C653	1 Byte	Gasha Seed planted at ??
$C654	1 Byte	Gasha Seed planted at ??
$C655	1 Byte	Gasha Seed planted at ??
$C656	1 Byte	Gasha Seed planted at K7
$C657	1 Byte	Gasha Seed planted at ??
$C658	1 Byte	Gasha Seed planted at ??
$C659	1 Byte	Gasha Seed planted at ??
$C65A	1 Byte	Gasha Seed planted at ??
$C65B	1 Byte	Gasha Seed planted at M9

Mysterious Counter

$C65C - $C65D

A counter for ??? for which various actions increment

Action	Incrementation	Note
Dig a Hole	0x01
Slay an Enemy	0x03	This excludes using gale seeds on enemies, and knocking them into water/holes.
Collect a Heart	0x04
Screen Transition	0x05	This excludes entering/exiting structures, or taking mini-boss warps in dungeons.
Collect a Fairy	0x18
Bomb a Wall	0x32
Great Fairy Heal	0x40
Collect a Heart Piece	0x64

Dungeon Things

RAM	Length	Purpose	Note
$C662	1 Byte	Has entered Hero's Cave	Exiting a sublevel or using a mini-boss warp in the corresponding level will also set these flags (though redundant). [There's more to these addresses than originally thought. More exploration needed.]
$C663	1 Byte	Has entered Level 1: Gnarled Root Dungeon
$C664	1 Byte	Has entered Level 2: Snake's Remains
$C665	1 Byte	Has entered Level 3: Poison Moth's Lair (?)
$C666	1 Byte	Has entered Level 4: Dancing Dragon Dungeon (?)
$C667	1 Byte	Has entered Level 5: Unicorn's Cave (?)
$C668	1 Byte	Has entered Level 6: Ancient Ruins (?)
$C669	1 Byte	Has entered Level 7: Explorer's Crypt (?)
$C66A	1 Byte	Has entered Level 8: Sword & Shield Maze (?)

$C66E	1 Byte	Small Keys — Hero's Cave
$C66F	1 Byte	Small Keys — Level 1: Gnarled Root Dungeon
$C670	1 Byte	Small Keys — Level 2: Snake's Remains
$C671	1 Byte	Small Keys — Level 3: Poison Moth's Lair
$C672	1 Byte	Small Keys — Level 4: Dancing Dragon Dungeon
$C673	1 Byte	Small Keys — Level 5: Unicorn's Cave
$C674	1 Byte	Small Keys — Level 6: Ancient Ruins
$C675	1 Byte	Small Keys — Level 7: Explorer's Crypt
$C676	1 Byte	Small Keys — Level 8: Sword & Shield Maze

$C67A	1 Byte	Has Big Key(s)
$C67C	1 Byte	Has Compass(s)
$C67E	1 Byte	Has Dungeon Map(s)

Items

RAM	Length	Purpose	Note
$C680	1 Byte	Item on B Button
$C681	1 Byte	Item on A Button
$C682	1 Byte	Inventory Slot 1
$C683	1 Byte	Inventory Slot 2
$C684	1 Byte	Inventory Slot 3
$C685	1 Byte	Inventory Slot 4
$C686	1 Byte	Inventory Slot 5
$C687	1 Byte	Inventory Slot 6
$C688	1 Byte	Inventory Slot 7
$C689	1 Byte	Inventory Slot 8
$C68A	1 Byte	Inventory Slot 9
$C68B	1 Byte	Inventory Slot 10
$C68C	1 Byte	Inventory Slot 11
$C68D	1 Byte	Inventory Slot 12
$C68E	1 Byte	Inventory Slot 13
$C68F	1 Byte	Inventory Slot 14
$C690	1 Byte	Inventory Slot 15
$C691	1 Byte	Inventory Slot 16

RAM	Length	Purpose	Note
$C6A2	1 Byte	Current Hearts
$C6A3	1 Byte	Max Hearts
$C6A5 - $C6A6	2 Bytes	Rupees	Value is represented in decimal. Example: If the total rupee count is 639, the hexadecimal representation will be 0x0639.
$C6A7 - $C6A8	2 Bytes	Ore Chunks
$C6A9	1 Byte	Shield level
$C6AA	1 Byte	Current Bombs
$C6AC	1 Byte	Sword level
$C6B1	1 Byte	Boomerang level
$C6B3	1 Byte	Slingshot level
$C6B4	1 Byte	Roc's feather level
$C6B5	1 Byte	Ember Seeds
$C6B6	1 Byte	Scent Seeds
$C6B7	1 Byte	Pegasus Seeds
$C6B8	1 Byte	Gale Seeds
$C6B9	1 Byte	Mystery Seeds
$C6BA	1 Byte	Gasha Seeds
$C6BB	1 Byte	Essences	0x01: Fertile Soil 0x02: Gift of Time 0x04: Bright Sun 0x08: Soothing Rain 0x10: Nurturing Warmth 0x20: Blowing Wind 0x40: Seed of Life 0x80: Changing Seasons Each essence has a corresponding value associated with it, each value being double the value of the previous one, and the value of this address will be the sum of all the essences collected up to 0xFF. Example: If the value of this address is 0x1F, the collected essences will be Fertile Soil, Gift of Time, Bright Sun, Soothing Rain, and Nurturing Warmth (5/8 essences in sequence). Any value in this address is valid, but many of them will not normally be used unless essences are collected out of sequence. Assuming all essences are collected in sequence, the value will progress as follows: 0x00 -> 0x01 -> 0x03 -> 0x07 -> 0x0F -> 0x1F -> 0x3F -> 0x7F -> 0xFF
$C6CA	1 Byte	Vasu Ring Flags	0x01: Slayed 1,000 Monsters — Slayer's Ring 0x02: Collected 10,000 Rupees — Rupee Ring 0x04: Saved the World — Victory Ring Based on what events have occurred, the above values get added to this address. Obtaining each corresponding ring from Vasu then adds the corresponding value multiplied by 0x10 to this address. Example: If the value is 0x03, the player has collected 10,000 rupees and slayed 1,000 Monsters [0x02 + 0x01]. In this scenario, after the Rupee Ring is received, the value would then be 0x23 [0x03 + (0x02 * 0x10)], and then when the Slayers Ring is received, the value is 0x33 [0x23 + (0x01 * 0x10)]. Possible Values # 1,000 Monsters Slain 10,000 Rupees Collected Saved the World Slayer's Ring Obtained Rupee Ring Obtained Victory Ring Obtained VALUE 1 FALSE FALSE FALSE FALSE FALSE FALSE 0x00 2 TRUE FALSE FALSE FALSE FALSE FALSE 0x01 3 FALSE TRUE FALSE FALSE FALSE FALSE 0x02 4 TRUE TRUE FALSE FALSE FALSE FALSE 0x03 5 FALSE FALSE TRUE FALSE FALSE FALSE 0x04 6 TRUE FALSE TRUE FALSE FALSE FALSE 0x05 7 FALSE TRUE TRUE FALSE FALSE FALSE 0x06 8 TRUE TRUE TRUE FALSE FALSE FALSE 0x07 9 TRUE FALSE FALSE TRUE FALSE FALSE 0x11 10 TRUE TRUE FALSE TRUE FALSE FALSE 0x13 11 TRUE FALSE TRUE TRUE FALSE FALSE 0x15 12 TRUE TRUE TRUE TRUE FALSE FALSE 0x17 13 FALSE TRUE FALSE FALSE TRUE FALSE 0x22 14 TRUE TRUE FALSE FALSE TRUE FALSE 0x23 15 FALSE TRUE TRUE FALSE TRUE FALSE 0x26 16 TRUE TRUE TRUE FALSE TRUE FALSE 0x27 17 TRUE TRUE FALSE TRUE TRUE FALSE 0x33 18 TRUE TRUE TRUE TRUE TRUE FALSE 0x37 19 FALSE FALSE TRUE FALSE FALSE TRUE 0x44 20 TRUE FALSE TRUE FALSE FALSE TRUE 0x45 21 FALSE TRUE TRUE FALSE FALSE TRUE 0x46 22 TRUE TRUE TRUE FALSE FALSE TRUE 0x47 23 TRUE FALSE TRUE TRUE FALSE TRUE 0x55 24 TRUE TRUE TRUE TRUE FALSE TRUE 0x57 25 FALSE TRUE TRUE FALSE TRUE TRUE 0x66 26 TRUE TRUE TRUE FALSE TRUE TRUE 0x67 27 TRUE TRUE TRUE TRUE TRUE TRUE 0x77
$C6C6	1 Byte	Ring Box level

TBD

RAM	Length	Purpose	Note
$C700 - $C7FF	256 Bytes	Overworld Screen Flags (used to track events and map exploration)	To do: Specify which each address tracks.
$CC30	1 Byte	Enemies left on screen
$CE00 - $CEAF		Current Screen Collision Data	Dynamically generated from the screen tile data. This space is also used as a temporary store for compressed level data read from ROM.
$CF00 - $CFAF		Current Screen Tile Data

Unmapped

RAM	Note
$C000 - $C5BF
$C600 - $C601
$C607 - $C615
$C620 - $C621
$C626
$C628 - $C639
$C63D
$C63F - $C64B
$C65E - $C661
$C66B - $C66C
$C677 - $C679
$C67B
$C67D
$C67F
$C692 - $C6A1
$C6A4
$C6AB
$C6AD - $C6B0
$C6B2
$C6BC - $C6C5
$C6C7 - $C6FF
$C800 - $CC2F
$CC31 - $CDFF
$CEB0 - $CEFF
$CFB0 - $CFFF