Final Fantasy V
Save Format Details
By: MottZilla

This document is notes on the save data in Final Fantasy V. With this information you can modify data however you wish. 

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FFV has 8 Kilobytes of SRAM divided up into 5 parts. The first four parts are the 4 save slots. They are arranged on $700 byte increments but only $600 bytes are used in each file. At $1C00 most of the area is empty except for the end around $1FF0 which holds data about each save file. All four save files are the same data just at different locations. The final area will be explained first.

$0000 - Save Slot 1
$0700 - Save Slot 2
$0E00 - Save Slot 3
$1500 - Save Slot 4
$1FF0 - Checksum and Use Table

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At $1FF0, which would appear at $7FF0 relative to the SNES memory map, there is a table of four 16-bit checksums. Then at $1FF8 there is another table which contains $E41B if a save file is in use, anything else and it is not. The checksums are generated by taking the $600 byte file and adding each 16-bit word together. Carry is used so if the value overflows from $FFFF you will set carry and impact the next addition with ADC. 

Example: $FFFF + $0001 = $0000 + Carry
Final Result: $0001

Whenever a file appears for loading or saving the checksum is quickly calculated to determine if the file is valid. If the checksum fails or the $1FF8 table entry doesn't contain $E41B then it appears blank, however it may still contain data as it is not overwritten. 

You can use this code patch to disable failure of checksums allowing for any data to be consider valid.

$C2/F576 : EA
$C2/F577 : EA

Here is a disassembly related to saving.

Disassembly:
$C2/F561 A5 F6       LDA $F6    [$00:01F6]   
$C2/F563 29 03 00    AND #$0003              
$C2/F566 0A          ASL A                   
$C2/F567 AA          TAX                     
$C2/F568 BD F8 7F    LDA $7FF8,x[$30:7FF8]   ; Check Slot In-Use Table
$C2/F56B C9 1B E4    CMP #$E41B              
$C2/F56E D0 0D       BNE $0D    [$F57D]      ; If not $E41B Skip
$C2/F570 20 88 F5    JSR $F588  [$C2:F588]   ; $F588 Returns Checksum
$C2/F573 DD F0 7F    CMP $7FF0,x[$30:7FF0]   ; Compare against Csum
$C2/F576 D0 0A       BNE $0A    [$F582]      ; table.
$C2/F578 A9 00 00    LDA #$0000              ; $0000 File Valid
$C2/F57B 80 08       BRA $08    [$F585]      
$C2/F57D A9 00 80    LDA #$8000              ; File not in Use
$C2/F580 80 03       BRA $03    [$F585]      
$C2/F582 A9 00 40    LDA #$4000              ; Bad Checksum
$C2/F585 85 E0       STA $E0    [$00:01E0]   
$C2/F587 60          RTS                     

$C2/F588 8B          PHB                     
$C2/F589 DA          PHX                     
$C2/F58A 5A          PHY                     
$C2/F58B 08          PHP                     
$C2/F58C F4 30 30    PEA $3030               
$C2/F58F AB          PLB                     
$C2/F590 AB          PLB                     
$C2/F591 C2 20       REP #$20                
$C2/F593 A6 FC       LDX $FC    [$00:01FC]   
$C2/F595 A0 00 06    LDY #$0600              ; Save File Size
$C2/F598 A5 8E       LDA $8E    [$00:018E]   
$C2/F59A 18          CLC                     
$C2/F59B 7D 00 00    ADC $0000,x[$30:0000]   
$C2/F59E E8          INX                     
$C2/F59F E8          INX                     
$C2/F5A0 88          DEY                     
$C2/F5A1 88          DEY                     
$C2/F5A2 D0 F7       BNE $F7    [$F59B]      
$C2/F5A4 28          PLP                     
$C2/F5A5 7A          PLY                     
$C2/F5A6 FA          PLX                     
$C2/F5A7 AB          PLB                     
$C2/F5A8 60          RTS                     

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Interesting Save Slot File addresses.

There are 4 character slots at the beginning of save files. Each character slot is $50 bytes.

$0000 - Character Slot 1
$0050 - Character Slot 2
$00A0 - Character Slot 3
$00F0 - Character Slot 4

Within each character slot.
$00
Bit7 toggle if Character is in Front Row or Back Row.
Bit6 toggle if Character is present in party or empty.
Bits 012 determine Character, Bartz, Lenna, Galuf, Faris, Krile.

$01 - Current Job.
Table:
$00 Knight
$01 Monk
$02 Thief
$03 Dragoon
$04 Ninja
$05 Samurai
$06 Berserkr
$07 Hunter
$08 MysticKnt
$09 WhiteMage
$0A BlackMage
$0B TimeMage
$0C Summoner
$0D BlueMage
$0E Red Mage
$0F Mediator
$10 Chemist
$11 Geomancr
$12 Bard
$13 Dancer
$14 Mimic
$15 Normal

$02 - Current Level
$03 - Experience Points (24-bit)
$06 - Current HP (16-bit)
$08 - Maximum HP (16-bit)
$0A - Current MP (16-bit)
$0C - Maximum MP (16-bit)
$0E - Equipped Head Item
$0F - Equipped Body Item
$10 - Equipped Relic Item
$13 - Equipped R-Hand Item
$14 - Equipped L-Hand Item
$16 - Battle Command Slot 1
$17 - Battle Command Slot 2
$18 - Battle Command Slot 3
$19 - Battle Command Slot 4
$1A - Status (ex: Poison)
$24 - Strength
$25 - Agility
$26 - Vitality
$27 - Magic Power
$3A - Job Level
$3B - Ability Points

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Inventory for each slot is at $140. The first $100 bytes make up a table of Item types. For example $E0 is a Potion. At $240 is another $100 byte table for how many of each item you have. 

At $03F7 there appears to be bit tables which store what abilities each character has learned. No exact details available yet. May be $14 byte tables for each character.

( These Masks apply to all characters )
$0450 - Sword Ability Bitmask, then White Magic Ability Bit Mask
	then Black Magic, then DmMagic, then Esper, then Song,
Ending at $045B as last byte of Songs.

$0447 - Money/Gold/Gil (24-bit)
$05D8 - Map X Position
$05D9 - Map Y Position


EOF