Heroes_Mice_(Unl)[Nice_Code] pass 1

game
  crc: 7d87aac6
  title: Heroes_Mice_(Unl)[Nice_Code]
  board: 256
    memory
      type: ROM
      size: 0x8000
      content: Program
    memory
      type: ROM
      size: 0x8000
      content: Character

E: Mapper: 256

ERROR:  Unsupported mapper


Heroes_Mice_(Unl)[Nice_Code] pass 2

game
  crc: 7d87aac6
  title: Heroes_Mice_(Unl)[Nice_Code]
  board: 256
    memory
      type: ROM
      size: 0x8000
      content: Program
    memory
      type: ROM
      size: 0x8000
      content: Character

E: Mapper: 256

ERROR:  Unsupported mapper


Heroes_Mice_(Unl)[Nice_Code] pass 3

game
  crc: 7d87aac6
  title: Heroes_Mice_(Unl)[Nice_Code]
  board: 256
    memory
      type: ROM
      size: 0x8000
      content: Program
    memory
      type: ROM
      size: 0x8000
      content: Character

E: Mapper: 256

ERROR:  Unsupported mapper