iNES Mapper 153 is used for a Bandai FCG board with an LZ93D50 ASIC and 8192 bytes of battery-backed WRAM. These 8192 bytes must be denoted as PRG-NVRAM in the NES 2.0 header using byte value $70. Only one game, Famicom Jump II: Saikyou no 7-nin, uses this mapper.
Mask: $800F 7 bit 0 ---- ---- xxxx xxxP | +-- Select 256 KiB outer PRG-ROM bank at CPU $8000-$FFFF
These four registers function the same way as on INES Mapper 016, submapper 5.
Mask: $800F 7 bit 0 ---- ---- ..E. .... | +-------- PRG-RAM Chip Enable (1=Enable)
When booting with WRAM filled with zeroes, Famicom Jump II will freeze with a black screen. Simply soft-resetting the console will then always run the game properly unless WRAM is zeroed out again.
Categories: INES Mappers, Mappers with CHR RAM, Mappers with cycle IRQs