INES Mapper 032

iNES Mapper 032 represents games using Irem’s G-101 mapper IC. It came in a 52-pin DIP package.

Example Games:

• Image Fight
• Major League
• Kaiketsu Yanchamaru 2
• Paaman - Enban o Torikaese!!

• CPU $8000-$9FFF (or $C000-$DFFF): 8 KiB switchable PRG ROM bank
• CPU $A000-$BFFF: 8 KiB switchable PRG ROM bank
• CPU $C000-$DFFF (or $8000-$9FFF): 8 KiB PRG ROM bank, fixed to the second-to-last bank
• CPU $E000-$FFFF: 8 KiB PRG ROM bank, fixed to the last bank
• PPU $0000-$03FF: 1 KiB switchable CHR bank
• PPU $0400-$07FF: 1 KiB switchable CHR bank
• PPU $0800-$0BFF: 1 KiB switchable CHR bank
• PPU $0C00-$0FFF: 1 KiB switchable CHR bank
• PPU $1000-$13FF: 1 KiB switchable CHR bank
• PPU $1400-$17FF: 1 KiB switchable CHR bank
• PPU $1800-$1BFF: 1 KiB switchable CHR bank
• PPU $1C00-$1FFF: 1 KiB switchable CHR bank

Mask: $F000

7  bit  0
---------
...P PPPP
   | ||||
   +-++++- Select 8 KB PRG ROM at $8000-$9FFF or $C000-$DFFF

Mask: $F000

7  bit  0
---------
.... ..PM
       ||
       |+- Mirroring  (0: Vertical; 1: Horizontal)
       +-- PRG Mode

When ‘P’ is clear:

• the 8 KiB page at $8000 is controlled by the $800x register
• the 8 KiB page at $C000 is fixed to the second-to-last 8 KiB in the ROM

When ‘P’ is set:

• the 8 KiB page at $8000 is fixed to the second-to-last 8 KiB in the ROM
• the 8 KiB page at $C000 is controlled by the $800x register

Mask: $F000

7  bit  0
---------
...P PPPP
   | ||||
   +-++++- Select 8 KB PRG ROM at $A000-$BFFF

Mask: $F007

7  bit  0
---------
CCCC CCCC
|||| ||||
++++-++++- Select 1 KiB CHR bank

• Major League wants hardwired 1-screen mirroring. (CIRAM A10 is tied to +5V on this game). Additionally, the register at $9000 is entirely disabled: the game can only request “PRG mode 0”. An NES 2.0 submapper has been assigned for this difference, otherwise you’ll have to use a hash check.
• Naruko says that only the game “愛先生の OSHIETE 私の星” uses PRG mode 1, which is why it was documented incorrectly for so long.

• NES Mapper List by Disch
• Comprehensive NES Mapper Document by \Firebug\ information about mapper’s initial state is inaccurate.
• Naruko’s notes: [1]

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