Yousei's FF4 Notes - GameHackingDotOrg/FF4Hacking GitHub Wiki
This info is from Yousei, who worked strictly with v1.0 headered. As such, all offsets are probably high by 0×200, and even then some of them may be wrong depending on where they are in the ROM, since v1.1 included code fixes that probably affected various offsets.
Most things do indeed seem to be in the same places, and anyway this is a great resource.
- Lazy Bastard
RAM REFERENCES
$001700 Index of the current world ($00 == overworld, $01 == underground, $02 == moon)
$000EDB-$000FDB Stores current world map tile properties
$7F5C71 Beginning of Map data
CODE
07CEA- (00FAEA- ) Overworld map loader
07D78- (00FB78- ) Underground map loader
07DC5- (00FBC5- ) Moon map loader
AC8FA- (15C6FA- ) Routine that alters overworld map depending on events
DATA
09410-09419 (019210-019219) Positions of Characters on Menu Screens (x, y) (center, top, bottom, mid-top, mid-bottom)
09441- (019241- ) Menu Character Formations (?)
0C763-0C772 (01C563-01C572) Positions of Item Names on Shop Screens (x, y)
0C773-0C782 (01C573-01C582) Positions of Item Prices on Shop Screens (x, y)
0DA2A- (01D82A- ) Menu Screen Specifications (see below)
11D99- (029B99- ) Borders for Battle Menus
44200- (08C000- ) Title Screen Graphic Data
46A00-46AFF (08E800-08E8FF) Title Screen Palette Data
46B00-46EAF (08E900-08ECAF) —
47200- (08F000- ) Enemy Graphic Data
57200-581FF (0AF000-0AFFFF) Text Font (2 bitplanes)
68200-6823F (0D8000-0D803F) Overworld Character Palette Data
68240-6827F (0D8040-0D807F) Overworld Vehicle Palette Data
68280-682BF (0D8080-0D80BF) —
682D0-6843F (0D80D0-0D823F) Townspeople Palette Data
68440-688CF (0D8240-0D86CF) —
688D0-689CF (0D86D0-0D87CF) Character Portrait Palette Data
689D0-689DF (0D87D0-0D87DF) Window Palette Data
7015E- (0DFF5E- ) Enemy Size Data (multiply by 8 for pixel sizes)
70200-711FF (0E8000-0E8FFF) Enemy Combination Data (8 bytes, *6)
71200-7168F (0E9000-0E948F) Enemy Horizontal Position Data
71690-719FF (0E9490-0E97FF) —
71A00-720FF (0E9800-0E9EFF) Enemy Name Data
72200-723BF (0EA000-0EA1BF) Enemy Gold Totals
723C0-7257F (0EA1C0-0EA37F) Enemy Experience Totals
728A0-72A5F (0EA6A0-0EA85F) Enemy Stats Pointers
72A60-73638 (0EA860-0EB438) Enemy Stats
73639-738BF (0EB439-0EB6BF) —
74500-7453F (0EC300-0EC33F) Probability of Enemy Attack for the Overworld (1 byte == 32×32 tile region)
74540 (0EC340) Probability of Enemy Attack for the Underground (1 byte == entire map)
74541 (0EC341) Probability of Enemy Attack for the Moon (1 byte == entire map)
74742-74781 (0EC542-0EC581) Enemy Sets for the Overworld (1 byte == 32×32 tile region)
74782-74791 (0EC582-0EC591) Enemy Sets for the Underground (1 byte == 32×64 tile region)
74792-74795 (0EC592-0EC595) Enemy Sets for the Moon (1 byte == 32×32 tile region)
74796-74995 (0EC596-0EC795) Location Enemy Sets (1 byte == entire location)
74996-749ED (0EC796-0EC7ED) Enemy Combinations in Enemy Sets
74D00-74D0F (0ECB00-0ECB0F) Cursor and Battle Number Palette Data
77400-781FF (0EF200-0EFFFF) Battle Dialogue (pointers + 68200)
78200-78AFF (0F8000-0F88FF) Item Names (9 bytes each)
78B00-78CAF (0F8900-0F8AAF) Spell Names (6 bytes each)
78CB0-78FEF (0F8AB0-0F8DEF) Attack Names (8 bytes each)
7A650-7A74F (0FA450-0FA54F) GP Values of Items
7A750- (0FA550- ) Equipability of Items (1 word each)
7A910-7A963 (0FA710-0FA763) Character Names (6 bytes each)
7A964-7A9C5 (0FA764-0FA7C5) Character Class Names (7 bytes each)
7A9C6-7AA5B (0FA7C6-0FA85B) Battle Command Names (5 bytes each)
7AB00-7ACBF (0FA900-0FAABF) Characters’ Initial Statistics (32 bytes each, *3)
7ACC0-7ACFF (0FAAC0-0FAAFF) —
7AD00-7AD91 (0FAB00-0FAB91) Characters’ Initial Equipment (7 bytes each, *1)
7AD92-7AFFF (0FAB92-0FADFF) —
7B200-7B53C (0FB000-0FB33C) Battle Messages (pointers + 70200)
7B600-7B6BA (0FB400-0FB4BA) Abnormal Status Text (pointers + 70200)
7CC00-7CFFF (0FCA00-0FCDFF) Enemy Size Pointer, Palette Pointer, and Graphic Pointer Data
7D140-7D3FF (0FCF40-0FD1FF) —
7D400- (0FD200- ) Battle Background Palette Data
80200-805FF (108000-1083FF) Dialogue Bank 1 Pointers
80600-881FF (108400-10FFFF) Dialogue Bank 1 Data
88200-884FF (118000-1182FF) Dialogue Bank 2 Pointers
88500-901FF (118300-11FFFF) Dialogue Bank 2 Data
90200-903FF (128000-1281FF) Event Pointers
90400-971FF (128200-12EFFF) Event Data (each event is terminated by 0xFF)
97460-9765F (12F260-12F45F) Triggered Event Pointers (tells which FF trigger invokes which event)
97660-97817 (12F460-12F617) Triggered Event Data
97818-9785F (12F618-12F65F) —
98200-983FF (138000-1381FF) Event Placement Pointers
98400-998FF (138200-1396FF) Event Placement Data (4 bytes, *7)
99900-999FF (139700-1397FF) DTE Table
99A00-99DFF (139800-139BFF) Event Pointers (2)
9A500-9A6FF (13A300-13A4FF) Items in Shops (8 bytes per shop, FF == no item)
9A700-9A8FF (13A500-13A6FF) Dialogue Bank 3 Pointers
9A900-9D3FF (13A700-13D1FF) Dialogue Bank 3 Data
9FF50-9FFB7 (13FD50-13FDB7) Character Battle Commands (5 bytes each)
A0200-A07FF (148000-1485FF) World Map Tile Formation Data
A0800-A0AFF (148600-1488FF) World Map Tile Palette Pointers
A0B00-A0C7F (148900-148A7F) World Map Palette Data
A0C80-A0F7F (148A80-148D7F) World Map Tile Properties Data
A0F80-A0FFF (148D80-148DFF) —
A1000-A1FFF (148E00-149DFF) Town Map Tile Properties Data (*5)
A2000-A5FFF (149E00-14DDFF) Town Map Tile Formation Data (*4)
A6000-A6FFF (14DE00-14EDFF) Town Map Palette Data
A8200-A84FF (158000-1582FF) Town Trigger Pointers
A8500-A981F (158300-15961F) Town Trigger Data (*2)
A9820-A9CF0 (159620-159AF0) Town Titles
A9E84-AB204 (159C84-15B004) Town Properties
B0200-B067F (168000-16847F) World Map Row Pointers
B0680-B6D53 (168480-16EB53) World Map Row Data (each row is terminated by 0xFF)
B7EF8- (16FCF8- ) Starting position of character sprites on battle screen
B8200-B84FF (178000-1782FF) Town Map Pointers
B8500-D005F (178300-19FE5F) Town Map Data (each map is fixed at 32×32 tiles; no termination for rows)
D0060-D0065 (19FE60-19FE65) World Trigger Pointers
D0066-D01FF (19FE66-19FFFF) World Trigger Data (*2)
D0200- (1A8000- ) Battle Character Graphic Data
D8200- (1B8000- ) Overworld Character Graphic Data
E7000-E7E9F (1CEE00-1CFC9F) Enemy Palette Data
E7F00-E80FF (1CFD00-1CFEFF) Battle Character Palette Data
E8200-ED5BF (1D8000-1DD3BF) World Map Tile Graphic Data (also used to construct pointers to town gfx)
ED5C0-EEF3F (1DD3C0-1DED3F) Character Portrait Graphic Data
EEF40- (1DED40- ) Town Tile Graphic Data
F0200-F021F (1E8000-1E801F) Pointers to Town Tile Graphic Data (add to 0xE8200, but sometimes something else o_O)
F800A-F8013 (1EFE0A-1EFE13) Positions of Character Portraits on Menu Screen (x, y) (standard formation) (center, top, bottom, mid-top, mid-bottom)
F8014-F801D (1EFE14-1EFE1D) Positions of Character Portraits on Menu Screen (x, y) (inverted formation) (center, top, bottom, mid-top, mid-bottom)
Other Points of Interest:
913E1-914F9 (1291E1-1292F9) Mist Events
Event Script Bytecodes
D0 Toggle screen shake
D1 Screen flash
D2 Screen blur and unblur
D3
D4 Open Fat Chocobo screen
D5 Open a door
D6 Screen moves up 1 tile and down 1 tile
D7 Toggle running
D8 Toggle music fade
D9 Open Namingway screen
DA Toggle screen fade
DB xx Toggle status ailments xx
DC xx Inn (costs 50 * 2^xx GP)
DD xx Change character graphic to xx
DE xx Restore HP (10 * xx HP)
DF xx Restore MP (10 * xx MP)
E0 xx Add item xx to inventory
E1 xx Remove item xx from inventory
E2 xx yy
E3 xx Remove all status ailments but xx
E4 xx Add status ailments xx
E5 xx Add 100 * xx GP
E6 xx Add 50 * xx GP
E7 xx Add character xx to party
E8 xx Remove character xx from party
E9 xx Pause xx cycles
EA xx Fade song xx in
EB xx yy Repeat the following yy actions xx times
EC xx Fight battle with enemy set xx
ED xx Bring up shop xx
EE xx
EF xx Show message 1xx (2)
F0 xx Show message 0xx (1)
F1 xx Show message 1xx (1)
F2 xx
F3 xx
F4 xx
F5 xx
F6 xx Show message xx (3)
F7 xx Bring up item selection window (xx is the item that should be selected)
F8 xx Show message 1xx (1) with “Yes/No” box
F9 xx Toggle screen tint
FA xx Play song xx
FB xx Play sound effect xx
FC xx
FD xx Play visual effect xx
FE aa xx yy zz Load map aa at position (xx, yy), zz & 0×80 == Underground/Moon
FF END
Movement Codes
x0 Move Up
x1 Move Right
x2 Move Down
x3 Move Left
x4 Look Up
x5 Look Right
x6 Look Down
x7 Look Left
x8 Toggle Visibility
x9 Special Move #1
xA Special Move #2
xB Special Move #3
xC Special Move #4
xD Special Move #5
xE Special Move #6
xF Special Move #7
Menu Specifications:
0×0000 Menu X Position
0×0001 Menu Y Position
0×0002 Menu Width
0×0003 Menu Height
…… Menu Items
Menu Items:
0×0000 Item X Position (taking borders into account)
0×0001 Item Y Position (taking borders into account)
…… Item Text
(Terminated by 0×00 — end of menu)
(Terminated by 0×01 — more items follow)
Structure Offset Notation:
0xXXXX The value at 0xXXXX is a single byte value
0xXXXX-0xYYYY The value at 0xXXXX through 0xYYYY is a multi-byte value, swapping when necessary
0xXXXX:x-y Bits x through y at 0xXXXX are to be taken as a single value, not as a bitmask
0xXXXX:x…y Bits x through y at 0xXXXX are to be taken as a bitmask, not a single value
*1 — Characters’ Initial Equipment, 7 bytes
0×0000 Head
0×0001 Body
0×0002 Arms
0×0003 Left Hand
0×0004 Number of previous weapon in left hand
0×0005 Right hand
0×0006 Number of previous weapon in right hand
*2 — Trigger Data, 5 bytes
0×0000 X position
0×0001 Y position
0×0002 Destination map or event code
0×0003 Destination X position or event parameter
0×0004 Destination Y position or event parameter
*3 — Characters’ Initial Statistics, 32 bytes
0×0000:0-5 Commands, name on status screen, etc.
0×0000:6…7 Equipable Hands: Left, Right
0×0001:0-4 Appearance (overall)
0×0001:5-7 ?
0×0002 Experience Level
0×0003:0…7 Status Ailments: Poison, Darkness, Mute, Pig, Small, Toad, Stone, Swoon
0×0004:0…7 Status Ailments: ?, Petrify, Berserk, Charm, Sleep, Paralyze, Float, Curse
0×0005:0…7 Status Ailments: Count, ?, ?, ?, ?, ?, Stop, ?
0×0006:0…7 ?, ?, ?, ?, Barrier, Wall, ?, ?
0×0007-0×0008 Current HP
0×0009-0×000A Maximum HP
0×000B-0×000C Current MP
0×000D-0×000E Maximum MP
0×000F Strength
0×0010 Agility
0×0011 Vitality
0×0012 Wisdom
0×0013 Will
0×0014-0×0016 ?
0×0017-0×0019 Experience
0×001A-0×001C ?
0×001D-0×001F Experince to Level Up Modifier (+44?)
Character Name and Attack Indices:
01 Cecil
02 Kain
03 Rydia
04 Tellah
05 Edward
06 Rosa
07 Yang
08 Palom
09 Porom
0A Tellah (second time you meet him?)
0B Cecil (Paladin)
0C Tellah (?)
0D Yang (second time)
0E Cid
0F Kain (second time)
10 Rosa (second time)
11 Rydia, older
12 Edge
13 FuSoYa
14 Kain (third time)
15 Golbez
16 Anna
*4 — Town Map Tile Formation Data, 2 bytes
0×0000 8×8 tile (0×00-0xFF)
0×0001:0…1 ?
0×0001:2-4 Palette Index
0×0001:5 Tile Priority (0 = behind character, 1 = in front of character)
0×0001:6 Flip tile horizontally
0×0001:7 Flip tile vertically
*5 — Town Map Tile Properties, 2 bytes
0×0000:0 Can walk on/off tile
0×0000:1…2 ?
*6 — Enemy Combination Data, 8 bytes
0×0000:0…2 ?
0×0000:3 Forced Back Attack
0×0000:4 Dies like a boss
0×0000:5…6 ?
0×0000:7 Egg
0×0001-0×0003 Enemies
0×0004:0…1 ?
0×0004:2-3 # of 3rd enemy (see 0×0003)
0×0004:4-5 # of 2nd enemy (see 0×0002)
0×0004:6-7 # of 1st enemy (see 0×0001)
0×0005 Enemy Arrangemnt
0×0006:0 Can’t run from battle
0×0006:1 Dying in battle does not end the game
0×0006:2-3 Battle music
00: Regular battle music
01: Boss battle music
10: Fiend battle music
11: Make no change in the music (continue playing the current song)
0×0006:4 Human-style
0×0006:5 Auto-battle
0×0006:6 Enemies are floating
0×0006:7 Enemies are transparent
0×0007 ?
*7 — Event Placement Data, 4 bytes
0×0000 Event number
0×0001:0-4 Starting X position
0×0001:5…6 ?
0×0001:7 The “event” walks
0×0002:0-4 Starting Y position
0×0002:5 ?
0×0002:6/7 Characters can walk through the “event”
0×0003:0-1 Direction the “event” faces
00: Up
01: Right
10: Down
11: Left
0×0003:2-3 Event palette
0×0003:4 “Event” turns when spoken to
0×0003:5 “Event” moves in place even if not walking
0×0003:6-7 Movement speed
DTE Table (entries flagged with an asterisk aren’t really DTE)
80* 0 A0 yo C0* ’ E0 ot
81* 1 A1 y C1* . E1 be
82* 2 A2 i C2* - E2 el
83* 3 A3 al C3* … E3 om
84* 4 A4 ar C4* ! E4 ’s
85* 5 A5 h C5* ? E5 il
86* 6 A6 r C6* % E6 de
87* 7 A7 s C7* / E7 gh
88* 8 A8 at C8* : E8 ay
89* 9 A9 n C9* , E9 nt
8A e AA c CA f EA Wh
8B t AB ng CB d EB Yo
8C th AC ve CC ow EC wa
8D he AD ll CD se ED oo
8E t AE y CE EE We
8F ou AF nd CF it EF g
90 a B0 en D0 et F0 ge
91 s B1 ed D1 le F1 n
92 er B2 hi D2 f F2 ee
93 in B3 or D3 g F3 wi
94 re B4 , D4 es F4 M
95 d B5 I D5 ro F5 ke
96 an B6 u D6 ne F6 we
97 o B7 me D7 ry F7 p
98 on B8 ta D8 l F8 ig
99 st B9 b D9 us F9 ys
9A w BA I DA no FA B
9B o BB te DB ut FB am
9C m BC of DC ca FC ld
9D ha BD ea DD as FD W
9E to BE ur DE Th FE la
9F is BF l DF ai FF*
0×007CEC BF 00 80 16 LDA $168000, X Overworld pointers ($168000 == 0xB0200)
0×007CF2 BF 01 80 16 LDA $168001, X
0×007CFA BF 80 84 16 LDA $168480, X Overworld data ($168480 == 0xB0680)
0×007D03 BF 81 84 16 LDA $168481, X [New location: $208000 == 0×100200]
0×007D7A BF 00 82 16 LDA $168200, X Underground pointers ($168200 == 0xB0400)
0×007D80 BF 01 82 16 LDA $168201, X
0×007D88 BF 80 C4 16 LDA $16C480, X Underground data? ($16C480 == 0xB4680)
0×007D91 BF 81 C4 16 LDA $16C481, X [New location: $228000 == 0×110200]
0×007DC7 BF 00 84 16 LDA $168400, X Moon pointers ($168400 == 0xB0600)
0×007DCD BF 01 84 16 LDA $168401, X
0×007DD5 BF 80 E1 16 LDA $16E180, X Moon data? ($16E180 == 0xB6380)
0×007DDE BF 81 E1 16 LDA $16E181, X [New location: $248000 == 0×120200]