Final Fantasy I & II: Dawn of Souls/ROM map

The following article is a ROM map for Final Fantasy I & II: Dawn of Souls.

The following offsets have been determined for Final Fantasy I only. All offsets are given in hexadecimal format. All currently described ASM routines are in Thumb mode. (Under Construction)

General Purpose Routines

Core Routines:

• 000EFC-000F81 (000086) = Core division-related routines
• 000F18 = General division routine. Given r0 = divident and r1 = divisor, checks for zero and calls software division
• 000F2C = As above, but only returns remainder in r0
• 000F68 = Divides r1 by r2; stores the product in [r0],[r0+8] and the remainder in [r0+4]

Game-Specific Routines:

• 014E4C-014E6B (000020) = Uncompressed tile graphic size finder routine
• 014E6C-0158E7 (000A7C) = Unknown (Short ASM routines)
• 0158E8-0158FB (000014) = Chest State Determination Routine
• 0158FC-01591B (000020) = Unknown ASM Routine (reads $02001DF0)

FF1 Stat Routines

• 01591C-0159B3 (000098) = Total Attack Determination
• 0159B4-015ACB (000118) = Total Defence Determination
• 015ACC-015B8F (0000C4) = Total Evade Determination
• 015B90-015C23 (000094) = Effective Max HP Determination
• 015C24-015CB7 (000094) = Effective Max MP Determination
• 015CB8-015D4B (000094) = Total Intellect Determination
• 015D4C-015DDF (000094) = Total Agility Determination
• 015DE0-015E73 (000094) = Total Stamina Determination
• 015E74-015F07 (000094) = Total Strength Determination
• 015F08-015F43 (00003C) = Current HP/MP Determination (And Possible Truncation)
• 015F44-015F83 (000040) = Total Accuracy Determination

FF1 Animation Routines

• 01E2FC-01E8C3 (0005C8) = Root Spell/Weapon Animation Handling
• 01E8C4-01F12F (00086C) = Unknown Routines
• 01F130-01F1A3 (000074) = Conditional Animation Effect Handling
• 01F1A4-01F743 (0005A0) = Animation Chunk Storage Routine
• 01F744-02B4B3 (00BD70) = Unknown/Animation-related routines; exact function undetermined
• 02B4B4-02BE3F (00098C) = Unknown Routines

FF1 Text, Menu and Field Spell Routines

• 02BE40-02BF7F (000140) = Base Menu Window Drawing Routine
• 02BF80-02C0C3 (000144) = Base Text Printing Routine
• 02C0C4-02C43F (00037C) = Two Unknown Routines
• 02C440-02C7A7 (000368) = Base Number Printing Routine
• 02C7A8-0302BB (003B14) = Unknown
• 0302BC-0304DB (000220) = Out-of-Battle Spell Usability Pointer Table+Routines
• 0304DC-0308BB (0003E0) = Out-of-Battle Spell Effect Pointer Table+Routines
• 0308BC-038917 (00805C) = Unknown
• 038918-039347 (000A30) = Root Status Screen Drawing Routine
• 039348-03A1A7 (000E60) = Unknown Routines
• 03A1A8-03A26B (0000C4) = Out-of-Battle Healing Spell Base Healing Determination
• 03A26C-03A2FF (000094) = Armor Equipping: Writing to Memory
• 03A300-03A37F (000080) = Armor Removing: Adding to Inventory

FF1 Shopping Routines

• 043910-04465F (000D50) = Root Buying Window Logic
• 044660-044B83 (000524) = Unknown Routines
• 044B84-044BCB (000048) = Item/Armor/Weapon Sorting Order Loading Routine
• 044BCC-044C3B (000070) = Buying: Does item already exist among team's gear?
• 044C3C-044C6F (000034) = Buying: Does item already exist in inventory?
• 044C70-0454E3 (000874) = Root Spell Buying Routine?
• 0454E4-0456A3 (0001C0) = Spell Buying: Can purchaser learn this spell?
• 0456A4-0456E3 (000040) = Class Usability for Given Spell Determination
• 0456E4-045F9B (0008B8) = Unknown Routines
• 045F9C-04714B (0011B0) = Root Buying/Selling Screen Drawing Routine
• 04714C-0471DB (000090) = Unknown Shopping-Related Routine
• 0471DC-047813 (000638) = Root Shop Data Loading Routine?

FF1 Encounter Selection and Chest Routines

• 05AF34-05B1EF (0002BC) = Root Map Feature Data Loading and Processing Routine
• 05B1F0-05B277 (000088) = Map Feature Chunk Processing: Special Tiles and Objects
• 05B278-05B533 (0002BC) = Root Map Setup Routine?
• 05B534-05B9E3 (0004B0) = Root Encounter Checker and Selector

   05B5BE = Overworld Encounter RN Check
   05B5D8 = OW Type Encounter Handling:
       05B626 = Normal world map area
       05B630 = Rivers
       05B638 = Ocean/shipside
       05B640 = Deserts
       05B64E = Swamps
   05B83E = Normal Dungeon Handling
   05B85C = Soul of Chaos Dungeon Handling

• 05B9E4-05C4BF (000ADC) = Unknown Routines
• 05C4C0-05C6A7 (0001E8) = Root Chest Opening Handling
• 05C6A8-05C833 (00018C) = Unknown Routines
• 05C834-05CA33 (000200) = Chest Logic Part 2?

FF1 Misc Routines 1

• 0669B8-066A07 (000050) = Check for Fixed Encounter Square
• 066A08-0696AB (002CA4) = Unknown
• 0696AC-0696C3 (000018) = RNG Increment Subroutine
• 0696C4-06981F (00015C) = Unknown
• 069820-06A007 (0007E8) = Root Encounter Data Loading Routine
• 06A008-06A190 (000188) = Unknown
• 06A190-06A323 (000194) = Levelup: Determination of Gain/Strong Increase in one Stat

   06A1E0 = If gain not guranteed, roll 1/8 chance
   06A234 = HP Gain code
   06A264 = Warrior, Thief, Monk, Master cannot gain MP
   06A270 = MP Gain code

FF1 Battle Routines

Battle Menu Routines

• 06C26C-06C4A3 (000238) Unknown (Loading equipped item's associated spell?)
• 06C4A4-06CBD3 (000730) Unknown Routines
• 06CBD4-06D013 (000440) In Battle: Populating Equip Menu
• 06D014-06D1DF (0001CC) Unknown Routines
• 06D1E0-06D4B3 (0002D4) Root Spell Menu Waiting Loop
• 06D4B4-06DC5F (0007AC) Root Physical Attack Animation Handling?
• 06DC60-06DEFF (0002A0) Unknown Animation-Related Routine (run when PC turn comes up, when opening battle menus...)
• 06DF00-06EC5B (000D5C) Unknown Routines
• 06EC5C-06ED4F (0000F4) In-Battle: Party Member HP Printing (and Tinting) Routine
• 06ED50-06EFCF (000280) In Battle: Party Member Name or Status Printing Routine
• 06EFD0-06F08B (0000BC) In Battle: Print Names of All Living Monster Types
• 06F08C-06F1D7 (00014C) In-Battle: Item Menu Population & Usability Determination
• 06F1D8-06F2EF (000118) In-Battle: Spell Menu Population & Usability Determination
• 06F2F0-06F35F (000070) = In-Battle Spell Usability Routine
• 06F360-06F46F (000110) = In-Battle Spell Menu: MP Info Box Writing Routine
• 06F470-06F68B (00021C) = In-Battle Equip Menu: Equipment/Stats Names/Values Writing Routine"
• 06F68C-06F7E3 (000158) = In-Battle Equip Change Submenu: Gear Names Printing
• 06F7E4-06FB7B (000398) = Equip Change Submenu: Compare Current and Replacement Gear+Print
• 06FB7C-06FC8B (000110) = Root Monster Listing / Player Name&HP / Player MP Text Update Routine
• 06FC8C-06FDFB (000170) = In-Battle Equipment Swapping Handler
• 06FDFC-06FEC7 (0000CC) = Printing Text for In-Battle Description Boxes?

Turn Structure Routines

• 06FEC8-06FF1F (000058) = Inbattle Item Use: Storing Item ID/Type/Position to Memory
• 06FF20-06FFBB (00009C) = Monster Listing Updater
• 06FFBC-070027 (00006C) = Unit Check: Can Unit Act?
• 070028-070127 (000100) = PC Pose Determination (store ROM data to memory)
• 070128-070213 (0000EC) = PC Pose Determination 2 (store to unit data)