INES Mapper 157

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iNES Mapper 157 represents the Datach Joint ROM System, which adds a barcode scanner and unbanked CHR-RAM to a Bandai FCG board.

This mapper implies the presence of a X24C02 I²C EEPROM that is shared across all games that ever use this mapper.

However, it seems that Battle Rush is the only game that uses this EEPROM and is also the only one that adds an X24C01 almost-I²C EEPROM on the cartridge. It seems likely that this separation of the save data into two separate physical items is intentional.