INES Mapper 153

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.

Banks

CPU $6000-$7FFF: 8 KiB battery-backed WRAM
CPU $8000-$BFFF: 16 KiB switchable PRG-ROM bank
CPU $C000-$FFFF: 16 KiB PRG ROM bank, fixed to the last bank
PPU $0000-$1FFF: 8 KiB unbanked CHR-RAM

Registers

Outer PRG-ROM Bank Select ($8000-$8003 write)

Mask: $800F

7  bit  0
---- ----
xxxx xxxP
        |
        +-- Select 256 KiB outer PRG-ROM bank at CPU $8000-$FFFF

The same value must be written to all four registers, or the outer PRG-ROM bank would be switched as the PPU is rendering.
Because the ASIC’s PA12 and PA13 inputs are grounded, only registers $8000-$8003 instead of $8000-$8007 are relevant.
No CHR banking is available.

Inner PRG-ROM Bank Select ($8008 write)

Nametable Mirroring Type Select ($8009 write)

IRQ Control ($800A write)

IRQ Latch ($800B-$800C write)

These four registers function the same way as on INES Mapper 016, submapper 5.

PRG-RAM Control ($800D write)

Mask: $800F

7  bit  0
---- ----
..E. ....
  |
  +-------- PRG-RAM Chip Enable (1=Enable)

Note

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.

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