INES Mapper 114

iNES Mapper 114 is used for an MMC3-clone-bearing board with scrambled register addresses and indices, 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.

• Aladdin (SuperGame, not Super Aladdin, and not to be confused with Aladdin from J.Y. Company)
• The Lion King (SuperGame)
• Pocohontos (Hosenkan, not to be confused with Pocahontas Part 2 from SuperGame)
• Super Donkey Kong (Hosenkan)

Registers

NROM Override Register ($6000)

Mask: Probably $E001

D~7654 3210
  ---------
  M.S. BBBb
  | |  ++++- Select 16 KiB PRG-ROM bank at CPU
  | |        $8000-$BFFF and $C000-$FFFF
  | +------- 0: Do not replace bit 0 (NROM-128)
  |          1: Replace bit 0 with CPU A14 (NROM-256)
  +--------- 0: Use PRG bank from MMC3; ignore $6000 bits 0-3/5
             1: Ignore PRG bank from MMC3; apply $6000 bits 0-3/5

Outer CHR-ROM Bank Register ($6001)

Mask: Probably $E001

D~7654 3210
  ---------
  .... ...+- Select 256 KiB CHR-ROM bank at PPU $0000-$1FFF

MMC3-compatible registers ($8000-$FFFF)

Address written   MMC3 register meant
---------------   -------------------
$8000             $A001
$8001             $A000
$A000             $8000
$A001             $C000
$C000             $8001
$C001             $C001
$E000             $E000
$E001             $E001

$8000 index written   MMC3 register meant
-------------------   -------------------
0                     0
1                     3
2                     1
3                     5
4                     6
5                     7
6                     2
7                     4

Bits 6 and 7 of the value written to $8000 are unchanged. See MMC3 for further details.

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 that of the MMC3A, i.e. a latch value of zero disables the IRQ, on which Aladdin depends.
• Previous descriptions of Mapper 114/182 claim that a write to address $C001 is equivalent to writing both to an MMC3's $C000 and $C001 registers, and that writing to $A001 has no effect. A comparison of Aladdin (Mapper 114) and the Super Aladdin (Mapper 4, by the same developer) however indicates a one-to-one mapping, provided that MMC3A-like IRQ behavior is enforced.

Similar Mappers

• INES Mapper 115 has the same $6000 and $6001 registers, but does not scramble MMC3 register addresses and indices. Also, Mapper 115's IRQ behavior resembles that of the MMC3C, 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.
• INES Mapper 123 moves the $6000 register to $5800 while rearranging its bits and drops the outer CHR-ROM bank register at $6001 as well as register address scrambling while retaining index register scrambling (using the same pattern).
• INES Mapper 182 is a duplicate of Mapper 114. In fact, FCEUX explicitly reassigns Hosenkan's Mapper 182 ROMs to Mapper 114. Because Hosenkan's games make no use of the $6000-$6001 registers, other than writing zero to both of them on startup, some implementations (such as the EverDrive N8's) do not emulate the $600x registers.
• INES Mapper 215 extends and moves $6000/$6001 to $5000/$5001, and makes the MMC3 register address and index scrambling pattern selectable via $5007.