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		Unappraised rings carried
$C602 - $C606	5 Bytes	Player name
$C616 - $C61D	8 Bytes	Rings owned
$C61E - $C61F	2 Bytes	Deaths
$C620	1 Byte	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 0x01 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
Great Fairy Heal	0x40
Bomb a Wall	0x32
Collect a Fairy	0x18
Screen Transition	0x05	This excludes entering/exiting structures, or taking mini-boss warps in dungeons. (TODO: Test Gale seeds)
Collect a Heart	0x04
Slay an Enemy	0x03

Dungeon Things

RAM	Length	Purpose	Note
$C662	1 Byte	Has entered Hero's Cave
$C663	1 Byte	Has entered Level 1: Gnarled Root Dungeon	Exiting a sublevel or using a mini-boss warp will also set this flag (though redundant).
$C664	1 Byte	Has entered Level 2: Snake's Remains (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C665	1 Byte	Has entered Level 3: Poison Moth's Lair (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C666	1 Byte	Has entered Moblin's Keep (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C667	1 Byte	Has entered Level 4: Dancing Dragon Dungeon (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C668	1 Byte	Has entered Level 5: Unicorn's Cave (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C669	1 Byte	Has entered Level 6: Ancient Ruins (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C66A	1 Byte	Has entered Level 7: Explorer's Crypt (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C66B	1 Byte	Has entered Level 8: Sword & Shield Maze (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C66C	1 Byte	Has entered Onox's Castle (?)	Assumed based on context of other RAM addresses. TODO: Confirm.

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 (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C671	1 Byte	Small Keys — Level 3: Poison Moth's Lair (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C672	1 Byte	Small Keys — Moblin's Keep (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C673	1 Byte	Small Keys — Level 4: Dancing Dragon Dungeon (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C674	1 Byte	Small Keys — Level 5: Unicorn's Cave (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C675	1 Byte	Small Keys — Level 6: Ancient Ruins (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C676	1 Byte	Small Keys — Level 7: Explorer's Crypt (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C677	1 Byte	Small Keys — Level 8: Sword & Shield Maze (?)	Assumed based on context of other RAM addresses. TODO: Confirm.
$C678	1 Byte	Small Keys — Onox's Castle (?)	Assumed based on context of other RAM addresses. TODO: Confirm.

$C67A	1 Byte	Has Boss Key	True if value ends in 2, 3, 6, 7, A, B, E, or F (TODO: Determine why multiple values evaluate to True)
$C67C	1 Byte	Has Compass	True if value ends in 2, 3, 6, 7, A, B, E, or F (TODO: Determine why multiple values evaluate to True)
$C67E	1 Byte	Has Dungeon Map	True if value ends in 2, 3, 6, 7, A, B, E, or F (TODO: Determine why multiple values evaluate to True)

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
$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. Collecting each corresponding ring 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]. After the Rupee Ring is received, the value is then 0x23 [0x03 + (0x03 * 0x10)], and then when the Slayers Ring is received, the value is 0x33 [0x23 + (0x01 * 0x10)].
$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)
$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 - $C66C
$C679
$C67B
$C67D
$C67F
$C692 - $C6A1
$C6A4
$C6AB
$C6AD - $C6B0
$C6B2
$C6BC - $C6C5
$C6C7 - $C6FF
$C800 - $CC2F
$CC31 - $CDFF
$CEB0 - $CEFF
$CFB0 - $CFFF