Pet_Dance_(Unl)[Mars_Production] pass 1

game
  crc: a6263e6f
  title: Pet_Dance_(Unl)[Mars_Production]
  board: 256
    memory
      type: ROM
      size: 0x20000
      content: Program
    memory
      type: ROM
      size: 0x20000
      content: Character

E: Mapper: 256

ERROR:  Unsupported mapper


Pet_Dance_(Unl)[Mars_Production] pass 2

game
  crc: a6263e6f
  title: Pet_Dance_(Unl)[Mars_Production]
  board: 256
    memory
      type: ROM
      size: 0x20000
      content: Program
    memory
      type: ROM
      size: 0x20000
      content: Character

E: Mapper: 256

ERROR:  Unsupported mapper


Pet_Dance_(Unl)[Mars_Production] pass 3

game
  crc: a6263e6f
  title: Pet_Dance_(Unl)[Mars_Production]
  board: 256
    memory
      type: ROM
      size: 0x20000
      content: Program
    memory
      type: ROM
      size: 0x20000
      content: Character

E: Mapper: 256

ERROR:  Unsupported mapper