Seiken Densetsu 3 / Trials of Mana

Seiken Densetsu 3 / Secret of Mana 2

RAM Map

ROM Map

Data Structures

Tilemap Offsets

3 bytes per offset, a string is terminated by FF
2 string are read: 1st for tilemap L1, 2nd for tilemap L2
1st pointer of a string points to the compressed tilemap, the rest are unknown

Exit Fields

(4 bytes per field

00      dest X coord
01      dest Y coord
        d6-d7   facing direction
03,02   destination

Location Data

By location index @ 7E6028, 1114 items, 10 bytes each

01,00   tilemap pack (+ $CB0000 = dynamic data, terminated by FF)
02      map pack (* 7 + $CD0750)
03      palette set
04
05
07,06   exit field index pack (+ $CB0000)
09,08   NPC map pointer (+ $CC0000)

Exit Field Index Packs

2 bytes per pointer, packs are dynamic size

some pointers: & 0x7FF * 2 + $CB49DC = offset of exit field
...yet others (& 0x7FF) look like actual location indexes?

Priority Sets

4 bytes each

00      d0-d4   Enable Mosaic
01      d0-d4   Enable Mainscreen
02      d0-d4   Enable Subscreen
03      d0-d4   Color Math
        d6      Half Intensity
        d7      Minus Subscreen

Monster Pack Collection

256 items, 6 bytes each

* 4 + $CC0600 = monster pack

Monster Packs

CC0600-CC09FF: 256 items, 4 bytes each

* 3 + $CC0A00/CC0D00 = monster/NPC pack

CC0A00-CC0CFF: 256 items, 3 bytes each

Graphics Packs

Dynamic, each string terminated by FFFF

* 3 + $CD02D0 = offset of pointer

Solidity Sets

Compressed, 2 bytes per tile

00      d0      SE Quadrant
        d1      SW Quadrant
        d2      NE Quadrant
        d3      NW Quadrant
        d4      N Edge Blocked
        d5      Can Slide Against
        d6      W Edge Blocked
01      d7      Exit Trigger Enabled

Animation Strings

00      d6,7    if clear, 4-byte length
        d6      unknown, 3-byte length if set
        d7      unknown, 1-byte length if set
        if d6/d7 clear: & 0x0F * 0x80 = offset of VRAM to draw to
01,02   unknown if 00,d6/d7 set
03,02   if d6/d7 clear: + $F70000 = offset of animation graphics

Tileset Packs

107 items, 7 bytes each

00      Tileset L1 (* 2 + $CD01B0 = offset of pointer)
01      Tileset L2 (* 2 + $CD01B0 = offset of pointer)
02      Scrolling L2
        d0-d2   Speed
        d3      Enable Scrolling
03      & 0x0F = Priority Set
04      Animation Index
        * 2 + CCFC00 = pointer's offset
06,05   Graphics Pack (bank $CC)

Palette Sets

180 bytes each, 6 palettes per set, 30 bytes per palette

Monster Stats

128 items, 36 bytes each

00      sprite
01      palette
04-02   pointer to action script

Sprite Mold Pointers

2 bytes each, 162 items total

* 4 + $D50000 = offset of mold pack
Duran, Kevin, Hawk, Angela, Carlie, Lise (the rest are NPCs)

Monster Base HPs

696 items, 2 bytes each

(level - 1) * 14

Monster XPs

3 bytes each

00 ?
01 ?
02 ?

Data Tables

Monsters

There's a total of 128 monsters.

00      mem addr (+ $7E2F00)
01      compare value @ mem addr, skip NPC if not within range
        d0-3    max value
        d4-7    min value
02      NPC pack
03      NPC type
        d0-3    if == 15, monster(s)
        d7      enable event trigger?
05,04   event script pointer

if not monster(s)...
06      X coord
07      Y coord
08      sprite index

else...
06      level of monsters
07,08   X,Y coord of 1st monster
09,0A   X,Y coord of 2nd monster
0B,0C   X,Y coord of 3rd monster

2nd and 3rd monsters are optional; terminated by 0xFF

LEVEL 18 (Rabite Forest, from CCJ)

32 03 10 
8F 00 0E 
01 
04 08 
8D 0D 
49 1F 

32 03 10 
8F 00 0E 
01 
88 2C 
FF      terminate npc string

32      
4F      d0-3
        d4-7
16      NPC set (* 6 + $CC0000 = NPC set)
8F      d0-3
        d4-7
00 0E 
08      level of monsters
04 08   X,Y coord of NPC 0
8D 0D   X,Y coord of NPC 1
49 1F   X,Y coord of NPC 2

32 4F 16 
8F 00 0E 
08      level of monsters
88 2C   X,Y coord of NPC 3
FF      terminate npc string

FF      terminate map string


LEVEL 811 (Castle City Jad, Weapon/Armor)

38      mem addr (+ $7E2F00)
00      d0-3    if mem addr >=, skip NPC
        d4-7    if mem addr <, skip NPC
                if d0-3 < d4-7, branch to $C27AE4
                else skip NPC
9B      NPC set
A0      NPC type
        if & 0x0F == 0x0F, monster (else, non-monster)
        d4  
        d5  
        d6  
        d7  enable event trigger
60 81   event pointer
47 07   X,Y coord of NPC 0
13      sprite index (in set)

38 
2F 
9B      NPC set
A0 
87 89   event pointer
47 07   X,Y coord of NPC 1
13      sprite index (in set)

20 
1F 80 
A0 50 41 
0B 09 
22 

FF 

$D104A4 Rabite (36 bytes)
00      sprite ($1A = Rabite)
01      palette ($21 = Rabite)
04-02   action script

00  1
01  1
02  1
03  1
04  2
05  1
06  1
07  1
08  1
09  1
0A  1
0B  1
0C  1
0D  2
0E  1
0F  1
10  2
11  2
12  2
13  2
14  3
15  4   jump to address (3,2,1)
16  2
17  4   jump to address (3,2)
18  2
19  2
1A  2
1B  2
1C  2
1D  2
1E  2
1F  2
20-2F   1
30-3F   1
40  2
41  2
42  2
43  2
44  2
45  2
46  2
47  2
48-4F   2   load script from pointer @ beg. of banks $D2-D9 resp.
50-5F   2   branching commands: 1,0 & 0xFFF = branch (signed)
60-6F   2   branching commands: 1,0 & 0xFFF = branch (signed)
70-7F   2
80  2
81  2
82  2
83  2
84-8F   1
90-EF   1
F0  2
F1  2
F2  2
F3  2
F4  2
F5  2
F6  2
F7  2
F8  1
F9  1
FA  1
FB  1
FC  1
FD  1
FE  1
FF  1

$D25799 Rabite action script
04 00 
15 DD E1 D2     pointer to address ($D2E1DD)
FD 
F8 
18 36 
15 74 57 D2     pointer to address ($D25774)
E2 
42 CF 
15 2E 39 D3     pointer to address ($D3392E)
FD 
05 
0A 

04 00 
16 05 84 
17 02 02 00 
C2 
57 06 
00 
C2 
57 D8 
57 10 
05 
CC 
40 88 
0D 02 
DC 
70 0A 

15 6A 56 D2     pointer to address ($D2566A)

CD 
40 F6 
0D 03 
F9 
50 00 
05 
0A 


05      d5-7    HP
07      d0-4    
08      d0-6
09      attack script
0A      d0-6    
0B      d0-6    
0C      d0-6    
0D      d0-6    
0E      d0-6
0F      d0-6
10      
11      
12      
13      
14      
15      

11  Night Blade 13 11 F5 42 D2 A0 00 1E 01 00 01 A8 B9 B4 D4 D4 FA 00 00 10 00 20 00 00 00 21 00 00 00 00 00 00 00 10 03 03 
16  Wizard      15 16 0E 46 D2 A0 00 1E A3 32 00 AE 05 BA CB E3 FC 00 00 00 3F 00 00 00 00 21 00 00 00 00 00 00 00 10 03 03 
21  Rabite      1A 21 99 57 D2 A0 00 5A D1 E4 89 B0 E2 D5 E3 E3 FD 00 00 00 00 00 40 00 00 21 00 00 00 00 00 00 00 10 03 03 

Levels

Molds

D5283F
24      & 0x0F = chunk count
        d4
        d5
        d6
        d7
32 

each byte (or word if lower nibble clear) is a chunk
3E      d0      load NW tile
        d1      load NE tile
        d2      load SW tile
        d3      load SE tile
        d4
        d5
        d6,7    mirror,invert
00 40   00      lower nibble clear, ie. same as last chunk
        01      d6,7    mirror,invert
2F      d6,7    mirror,invert
4A      d6,7    mirror,invert

F0      X pos of sprite from screen center (-10 here)
F0      Y pos of sprite from screen center (-10 here)

48      d0-3    N shift of 2nd chunk pair (8px here)
        d4-7    W shift of 2nd chunk pair (4px here)

80 01   & 0xFFE0 = offset of graphics, 1st chunk
E0 1E
C0 01   & 0xFFE0 = offset of graphics, 2nd chunk
21 1F
C1 04   & 0xFFE0 = offset of graphics, 3rd chunk
20 1F
C0 04   & 0xFFE0 = offset of graphics, 4th chunk

SRAM Format

Open your saveram file in your hex editor. Seiken Densetsu 3 has three save logs; each one takes up 0x800 bytes. The first 0x70 bytes, from 00 to 6F, are a kind of header -- it's the info that appears on the save / load screen, and has no effect on your actual game.

All addresses in this document will be for log 1; if you want to hack log 2, add 0x800; if you want to hack log 3, add 0x1000. For example, maximum MP for character 1, log 1 is at 0x1FF. Max MP for character 1, log 2 is at 0x9FF. Speaking of maximum MP, let's hack that right now, so you can get the hang of hacking Remember, values are always in reverse byte order.

SRAM Checksum

A checksum is the sum of all bytes in a file (or a certain part of it) that's used to check for file integrity. When you save your game, Seiken Densetsu 3 adds up all the bytes in your save log and writes that 2-byte sum at the end of your save log. When you come back to the game, it adds up all the bytes in the save log again and compares that to the stored checksum. If those two sums don't match, Seiken Densetsu 3 assumes that the save log is corrupt (maybe the battery failed or something) or doesn't exist.

This is a problem when you want to hack your saved game, because if you change the data without changing the checksum appropriately, Seiken Densetsu 3 will think the log is corrupt, and you'll get the dreaded "No Save File." When you're making only small changes, like you did in the Quick Start section, it's easy to fix the checksum, but if you make a lot of big changes, it'll be a lot easier to just recalculate the checksum. Hex Workshop has an easy way to do this. If you're using something else, it's up to you to figure out.

To calculate the checksum we will simply add all the bytes, excluding the last 2, in a log together, a simple Checksum 16. Select the proper block of data. The first 0x70 bytes of each save log are a kind of header and aren't included in the checksum. Start at 0x70 and select all the way down through 0x7FD. This is a total of 0x78E bytes for log 1. If this is a working save log you're looking at, the checksum you've calculated will be the same as the 2-byte value at 0x7FE of your saveram.

After you finish making all your changes to your save file, you need to fix the checksum before you can play it. Follow the above procedure. Take the value you've calculated and write it over the old checksum at 0x7FE.

General Stats

I don't know exactly where each character's data block begins and ends. For the first character, the first value I know is current HP at 0x172-0x173, and the last value I know is maximum MP at 0x1FF-0x200. I do know that each character's data takes up 0xFF bytes.

Important: All these following addresses will be for the first character's data. If you want to hack the second character's data, add 0xFF to the address. If you want to hack the third character, add 0x1FE. For instance, character one's current HP is at 0x172-0x173; character two's is at 0x271-0x272, and character three's is at 0x370-0x371.

Attack, Evade, Defense and Magic Defense are determined by your stats and equipment, so any changes to these won't be permanent.

Equipment

Weapons

A value of 0x00 is Nothing. 0x01-0x1E are Swords. 0x1F-0x2A are cool-looking "Nothing" swords with varying attack power. Each character's weapons take up 0x2A values: 0x01 is the first sword, 0x2B is the first glove, 0x55 is the first dagger, 0x7F is the first rod, 0xA9 is the first flail, and 0xD3 is the first spear. Sorry, no matter what weapon a character is equipped with, they'll look and fight the same as ever.

Armor, Helmets, Rings & Shields

0x00 is Nothing. 0x01-0x48 are helmets; each character takes up 0x0C values. 0x49-0x7E are rings; each character takes up 0x09 values. 0x7F-0xF6 are armor; each character takes up 0x14 values. 0xF7-0xFF are all shields! (I wonder if they're all available in the actual game.) Notice that you can put any armor type in any spot, which can lead to strange stats.

Magic

Detect was apparently dummied out and has no description or effect. Second and Third Level Power Attacks you can "cast" for 0 MP, though be warned that if the "wrong" character uses an attack, it'll look funny at best, and crash the game at worst. Enemies' Special Attacks (and trap effects, etc.); like character techs, they don't consume any MP. Most "SBD's" are just visual effects.

Spell Targeting has a valid range between 0x01 and 0x04: 01 is One, 02 is All, 03 is One/All, and 04 is caster (for ally-targeted spells) or last ally targeted (for enemy-targeted spells).

Class

Class family is a value from 00 to 05, with 00 being the Fighter classes, 01 being the Grappler classes, and so on. Class changes is 00 for the base class, 01 for a second-level class, and 02 for a third-level class. Light-dark scale can range between 00 and 03, with 00 being light-light and 03 being dark-dark.

Party Data

Item Ring

0x00 is Nothing. 0x01-0x18 are third-level class items. 0x19-0x1E are seeds. 0x1F-0x4E are magic items; these are arranged just like the spells they correspond to. 0x4F-0x52 are thrown weapons. 0x53-0x59 are recovery items. 0x5A-0x66 are special items, quest items, and dummied items (including 5A Magical Rope and 60 Dreamsee Herb). 0x67 on are Nothings.

Storage

This long list corresponds to the values that are used on your item ring. That is, 0x6A5 is how many Nothings you have in storage, 0x6A6 is how many Paladin Proofs, etc. A value of 0x00 means you don't have that item in storage, obviously. If you set all of these values to 0x01, you'll have one of every item in storage.

Notes

• Mode7 GFX are drawn in 8BPP linear format
• World Map Tilemaps are drawn on 8x8 tile basis

Information mostly from giangurgolo. SRAM Format originally written by Jair from the Vale, expanded up and corrected by various others.