Seiken Densetsu 3 extraction tool

Introduction

This repo is a collection of useless and incomplete tools for Seiken Densetsu 3.

For an unknown reason, I decided to try to extract has much information from this game as possible. This current version is only able to do few things, mainly about text extraction.

The tools work only on the japanese version of the game. The ROM used doesn't have a header (SHA-1: 209c55fd2a8d7963905e3048b7d40094d6bea965).

Status

What has been done:

• Main text font extraction
• Main text decompression

What is missing:

• Automatic extraction of the main text. Even if the compression scheme is understood, I'm currently only able to extract the simplest dialogs.
• Graphics
• ...

Usage

Extract the dialog 0x350 to out.png

./sd3.py dump_dialog rom.smc 0x350 out.png

Extract the font to out.png

./sd3.py dump_font rom.smc font.png

Short list of early game dialogs

Introduction

Dialog index	Note	Status
0x800	World map	KO
0xB08	First dialog of the game	KO
0x603	Battle ended	KO
0x220	King	KO

After introduction

Dialog index	Note	Status
0x350	Soldier	OK
0x340	Soldier	OK
0x352	Old man	OK
0x347	Dog	OK
0x342	Random guy	OK
0x7D4	Closed door (two dialogs)	OK
0x343	Random guy	OK
0x984	Shop	KO
0xC0D	Out of building transition	KO