The Final Fantasy Legend/RAM map

The following article is a RAM map for The Final Fantasy Legend.

This RAM map documents the memory layout of The Final Fantasy Legend (USA version). All addresses are CPU addresses in hexadecimal within the Game Boy memory space. The game uses standard DMG (monochrome) memory layout, with GBC-specific WRAM banks only used in colorization patches.

External RAM (A000-BFFF) - Save Data

Start	End	Size	Description	Notes
A000	BFFF	8 KiB	Save Slot	Single save slot: party data, inventory, progress flags
A000	A03F	64 B	Party Slot 1	Character data (64 bytes per slot)
A040	A07F	64 B	Party Slot 2	Character data
A080	A0BF	64 B	Party Slot 3	Character data
A0C0	A0FF	64 B	Party Slot 4	Character data
A100	A1FF	256 B	Inventory	Item data
A200	AFFF	3.5 KiB	Progress Data	Event flags, world state, etc.

Work RAM Bank 0 (C000-CFFF) - Runtime Data

Start	End	Size	Description	Notes
C000	C09F	160 B	OAM Copy 1	wOAM1 (saga1dx) - OAM copy/metasprite buffer
C100	C19F	160 B	OAM Copy 2	wOAM2 (saga1dx) - OAM copy/character animation
C300	C37F	128 B	RNG Seeds	wRandSeeds (saga1dx) - Each address used for specific RNG
C309	C309	1 B	Mutant HP Growth RNG	TASVideos semantics
C30B	C30B	1 B	Mutant Bonus Type RNG	Ability/HP/Mana/Agl/Str/Def/shuffle/none
C30E	C30E	1 B	Mutant Ability-Uses Shuffler	TASVideos semantics
C31B	C31B	1 B	HP Potion RNG	TASVideos semantics
C323	C323	1 B	Run Away RNG	0-126 can't run, 127-255 can run
C33B	C33B	1 B	Random Battle Trigger RNG	Terrain-based encounters
C343	C343	1 B	Encounter Monster Group RNG	TASVideos semantics
C34B	C34B	1 B	Mutant Ability Gained/Growth RNG	TASVideos semantics
C358	C358	1 B	Potion/X-Potion Recovery RNG	TASVideos semantics
C36F	C36F	1 B	Mutant Ability Slot RNG	1-4 (TASVideos semantics)
C38A	C399	16 B	Far-Call Template	wFarCall (saga1dx) - Init copies code from ROM $00E7..$00EF
C39A	C39C	3 B	VBlank Call Stub	wVBlank (saga1dx)
C425	C426	2 B	Soft Reset Sentinel	wSoftResetSentinel (saga1dx) - Value 0xE41B
C427	C427	1 B	Boot Flag	wBooted (saga1dx) - Set to 1 on first boot
CB00	CBFF	256 B	RNG Lookup Table	wRandTable (saga1dx) - 256-byte period, two-byte index → rolled value
CC0B	CC0B	1 B	Current Mutant Strength	Used in post-battle effect path (Gain S handler at $545A)
CC8E	CC8F	2 B	Runtime Gold	Packed BCD (verified: 416 GP trace, save +0x11C/+0x11E)

Work RAM Bank 1 (D000-DFFF) - Scene-Dependent

Start	End	Size	Description	Notes
D000	DFFF	4 KiB	Scene Buffer	Content varies by scene (saga1dx vanilla wram1.asm)
D000	DFFF	4 KiB	Overworld Tilemap	wTilemap (saga1dx) - 4 KiB when in overworld
D000	D3E8	1001 B	Battle States	wBattleStates (saga1dx) - $3E9 bytes when in battle
D3E9	D3EE	6 B	Battle Enemy ID	wBattleEnemyID (saga1dx) - 6 bytes
DE00	DEFF	256 B	Text Source Buffer	Message building buffer (verified: meat-eating message trace)

Text Buffers

Start	End	Size	Description	Notes
C600	C6FF	256 B	Textbox Buffer	WRAM textbox buffer (saga1dx menu.asm) - Source for window tilemap
DE00	DEFF	256 B	Text Source Buffer	Message building buffer - Copied to $C600 by routine $6008

VRAM (8000-9FFF) - Video RAM

Start	End	Size	Description	Notes
8000	8FFF	4 KiB	Tile Data	Character tiles, sprites
9000	97FF	2 KiB	Background Tilemap	BG tilemap
9800	9BFF	1 KiB	Background Tilemap Alt	Alternative BG tilemap
9900	99E7	232 B	Textbox Tilemap	20×10 textbox (used by $63DE routine)
9C00	9FFF	1 KiB	Window Tilemap	Window tilemap (used by menu load hook)

OAM (FE00-FE9F) - Sprite Attributes

Start	End	Size	Description	Notes
FE00	FE9F	160 B	OAM	Sprite attributes (hardware)

I/O Registers (FF00-FF7F)

Start	End	Size	Description	Notes
FF00	FF00	1 B	JOYPAD	Input register
FF01	FF02	2 B	SERIAL	Link cable
FF04	FF07	4 B	TIMER/DIVIDER	Timer and divider registers
FF0F	FF0F	1 B	INTERRUPT FLAG	IF register
FF10	FF26	23 B	SOUND	Audio registers
FF30	FF3F	16 B	WAVE PATTERN RAM	Audio wave data
FF40	FF4B	12 B	LCD/SCROLL/PALETTES	Display control registers
FF46	FF46	1 B	OAM DMA	OAM DMA transfer
FF4F	FF4F	1 B	VRAM Bank Select	GBC only

High RAM (FF80-FFFE)

Start	End	Size	Description	Notes
FF80	FFFE	127 B	HRAM	Fast access RAM

Interrupt Enable (FFFF)

Start	End	Size	Description	Notes
FFFF	FFFF	1 B	IE	Interrupt Enable register

GBC WRAM Banks (saga1dx patch-only)

These banks are only used in the colorization patch and are not present in the original DMG version.

WRAMX Bank 2 (D000-DFFF when selected)

Start	End	Size	Description	Notes
D000	D4FF	1.3 KiB	Metatile Attributes	wMetatileAttr (saga1dx) - $500 bytes
D500	D7FF	768 B	Metatile Buffer	wMetatileBuffer (saga1dx) - $300 bytes

WRAMX Bank 3 (D000-DFFF when selected)

Start	End	Size	Description	Notes
D000	D03F	64 B	BG Palettes	wPalettes BG (saga1dx) - $40 bytes
D040	D07F	64 B	OBJ Palettes	wPalettes OBJ (saga1dx) - $40 bytes
D080	D0BF	64 B	Battle Palettes	wPalettes Battle (saga1dx) - $40 bytes
D0C0	D0FF	64 B	Title Palettes	wPalettes Title (saga1dx) - $40 bytes
D300	D3FF	256 B	Palette Lookup	wPaletteLookup (saga1dx) - 256 bytes
DFFD	DFFF	3 B	Palette State	wRequestedPalette, wLastFadeValue, wIsTitle (saga1dx)

WRAMX Bank 5 (D000-DFFF when selected)

Start	End	Size	Description	Notes
D000	D1FF	512 B	Sprite IDs	wSpriteIDs (saga1dx) - 512 bytes
D200	D3FF	512 B	Sprite Attributes	wSpriteAttr (saga1dx) - 576 bytes (overlaps)

Notes

• All addresses are CPU addresses (hex) in Game Boy memory space
• External RAM (A000-BFFF) is battery-backed for save data
• Work RAM Bank 0 (C000-CFFF) is always accessible
• Work RAM Bank 1 (D000-DFFF) content varies by scene (overworld vs battle)
• GBC WRAM banks are only used in colorization patch (saga1dx)
• Text buffers: $DE00 (source) → $C600 (textbox) → VRAM $9900 (textbox tilemap) or $9C00 (window tilemap)
• RNG seeds at $C300-$C37F are consumed in fixed order, causing deterministic behavior on fresh saves
• Battle states structure at $D000-$D3E8 when in battle (wBattleStates, $3E9 bytes)
• Save file structure: 64 bytes per party slot × 4 slots = 256 bytes, plus inventory and progress data

Sources

• saga1dx vanilla wram0.asm, wram1.asm (GitHub: akatsuki105/saga1dx)
• TASVideos GameResources/GB/FinalFantasyLegend (RNG semantics)
• Traced execution (meat-eating message, post-battle effects)
• Save file dumps (docs/saves/fflsave-world1)