INES Mapper 115

iNES Mapper 115 denotes the 卡聖 (Kǎshèng) SFC-02B/-03/-004 boards, bearing an MMC3-clone with a 256 KiB outer CHR-ROM bank register and an NROM-like PRG-ROM register that can override the MMC3 clone's PRG-ROM bank. Used by:

• A.V. 究極麻將 II (A.V. Jiūjí Májiàng II, Kǎshèng re-release, originally released by 哥德 (Gouder) on INES Mapper 116)
• 包青天 (Bāo Qīngtiān, Justice Pao)
• 餓狼伝説 Special (Garō Densetsu Special, Kǎshèng re-release, originally released by 哥德 (Gouder) on INES Mapper 116)
• 雷電 II - Thunderbolt Fighting Plane (Léidiàn II)
• 三國春秋: 四川省 (Sānguó Chūnqiū: Sìchuān Shěng)
• 幽☆遊☆白書 Final (Yū Yū Hakusho Final, both Chinese and English versions)
• 1997 Super HiK 16-in-1 multicart

Registers

Mode/NROM Bank Register ($6000, write)

Mask: $E003

D~[MPN. PPPp]
   |||  ++++- If M=1: PRG A17..A14
   ||+------- 0: If M=1: PRG A14=p (NROM-128)
   ||         1: If M=1: PRG A14=CPU 14 (NROM-256)
   |+-------- PRG A18
   +--------- 0: MMC3 mode, PRG A17..A14=MMC3 PRG A17..A14
              1: NROM mode, PRG A17..A14=PPPp and "N" bit applies
Power-on value: $00

Outer CHR-ROM Bank Register ($6001, write)

Mask: $E003

D~[.... ...C]
           +- CHR A18
Power-on value: $00

Solder Pad Register ($6002, read)

Mask: $E003

D~[.... .VVV]
         +++- Solder Pad value

MMC3-compatible registers ($8000-$FFFF)

Mask: $E001, see MMC3.

Notes

• Unlike many similar mappers, the $600x registers are not connected to the MMC3 clone's WRAM interface and thus function regardless of whether WRAM is enabled or not.
• IRQ behavior resembles "Sharp" behavior, i.e. a latch value of zero causes an IRQ on every scanline, on which the Chinese version of 幽☆遊☆白書 Final (Yuu Yuu Hakusho Final) depends.

Similar Mappers

• INES Mapper 114 has the same $6000 and $6001 registers, but additionally scrambles MMC3 register addresses and indices. Also, Mapper 114's IRQ behavior resembles "NEC" behavior, i.e. a latch value of zero disables IRQ.
• INES Mapper 187 has a similar NROM override register, placed at $5000
• INES Mapper 248 is a duplicate of Mapper 115.