INES Mapper 116

iNES Mapper 116 denotes Gouder’s SOMARI-P circuit board bearing the Huang-1 or Huang-2 ASICs and a PAL, used by releases from Gouder, also known as 哥德 (Gēdé):

• Huang-1 chip (submappers 0/1):
  • A.V. 美少女戰士 Girl Fighting (A.V. Měi Shàonǚ Zhànshì)
  • 餓狼伝説 Special (Garō Densetsu Special, original Gouder release only)
  • Kart Fighter
  • Somari the Adventurer (original Gouder and Kǎshèng releases, two revisions)
• Huang-2 chip (submapper 2):
  • A.V. 究極麻將 II (A.V. Jiūjí Májiàng, original Gouder release only)
• Reset-based multicart with Huang-1 chip (submapper 3):
  • 瑪莉家族大集合 5-in-1 (Mario 5-in-1)

This mapper can simulate three different ASICs: the Nintendo MMC1, MMC3 and Konami VRC2 (A0/A1, i.e. VRC2b). All three simulated chips have their separate registers, so that when switching between modes using the supervisor register, the entire mapper state changes, including PRG/CHR-ROM switchable and fixed banks as well as IRQ state.

D~[.... .CMM] (Address & $E100)==$4100    
         |++- Mapper mode
         |     0: VRC2
         |     1: MMC3
         |     2: MMC1
         |     3: same as 2
         +--- Outer 256 KiB CHR-ROM bank (CHR A18)

Power-on value: $01 (MMC3 mode)

• Submapper 0 denotes the -W configuration of the PAL that resets the MMC1’s serial shift register when switching to MMC1 mode, equivalent to writing to $8000-$FFFF with bit 7 set. All single-game cartridges except for the GK2 version of Somari the Adventurer behave like that.
• Submapper 1 denotes the -P configuration of the PAL that does not reset the MMC1’s serial shift register when switching to MMC1 mode. Only the GK2 version of Somari the Adventurer behaves like that, and that game does not seem to rely on it.
• Submapper 2 denotes the Huang-2 version of the ASIC. Its MMC1 addresses 8 KiB rather than 16 KiB PRG-ROM banks, meaning that the PRG bank register value is shifted by one bit to the left compared to what one would write to a normal MMC1.
• Submapper 3 denotes a reset-based multicart with the first game having 256 KiB of PRG- and CHR-ROM each, the remaining ones 128 KiB of PRG- and CHR-ROM each.
• The VRC2 CHR-ROM registers are initialized on power-up to $FF. One version of Somari the Adventurer relies on this.
• Garō Densetsu Special relies on being able to write to mirrors of $8xxx, $9xxx, and $Axxx in VRC2 mode.
• The Kǎshèng rereleases of A.V. 究極麻將 II and Garō Densetsu Special use INES Mapper 115 instead.

• INES Mapper 014 and INES Mapper 238 use the same ASIC but with the PAL programmed differently to respond in other ways to other addresses.

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