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

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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

  • 06C26C-06C4A3 (000238) Unknown (Loading equipped item's associated spell?)
  • 06C4A4-06CBD3 (000730) Unknown Routines
  • 06CBD4-06D013 (000440) In Battle: Populating Equip Menu
  • 06D014-06D4B3 (0004A0) Unknown Routines
  • 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...)
  • 06DF00-06ED4F (000E50) Unknown Routines
  • 06ED50-06EFCF (000280) In Battle: Handling Status Effects at Unit's Turn
  • 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