Pokemon Stadium (J)

Pokémon Stadium (Japan only) is a reboot game. It loads a portion of code from disk, disables N64 OS and executes it.

Technical Details

• The game checks for the following 64DD units:
  • Japanese Retail Unit
  • Development Unit? [To be determined]
• The game loads the Disk ID and performs the following checks:
  • Checks if the Company Code is 01 (Nintendo).
  • Checks if the last 3 letters of the Game Code are PSJ.
  • Checks if the first letter of the Game Code is between E to Z.
  • Checks if the Disk Number is 01.
• If the checks are successful, then it's an Expansion Disk, then performs the following:
  • Load LBA 560 to 801684B0.
    The format is the following:

    504F4B45 SSSSAAAA DDDDDDDD ????????
    
    504F4B45 = "POKE"
    SSSS = LBA Start
    AAAA = LBA Block Amount
    DDDDDDDD = RAM Load Address and Code Entrypoint
    

  • Checks if the first 4 bytes are "POKE", then copy to 800AB200 (Function 8000C888).
  • Load <LBA Block Amount> from <LBA Start> at RAM Load Address.
  • Decrypt and boot the loaded code at described entrypoint address via LeoBootGame function (80009490).
    • The first 0x100 bytes of the loaded code are encrypted. See 64ddutils' bootcodecrypto.c for the crypto process.