Heres a load of good reading info for future rom hackers etc:
The following Documents have been submitted and approved to the database (in submitted order oldest to newest):
Assembly
Audio Hacking
- Streets of Rage 2: Modifying Sound Values
- The Legend of Zelda (NES) Music Hacking Document
- Mega Man/Rockman 2 Music/SFX Data Guide
Game Specific
- Double Dragon III Enemies Values
- Mega Man X6 Tweaks Spreadsheet
- Solstice room data documentation
- Ninja Gaiden 3 hacking values
Graphics Hacking