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| '''TQROM''' denotes Nintendo's NES-TQROM and [[Famicom|HVC]]-TQROM cartridge boards, which use the [[MMC3|Nintendo MMC3]] ASIC mapper.
| | #REDIRECT [[INES Mapper 119]] |
| This [[rare]] board, used only by ''Pinbot'' and ''High Speed'', is one of the few that have both CHR ROM and CHR RAM on the same board.
| | [[Category:Nintendo licensed mappers]] |
| The [[iNES]] format assigns [[iNES Mapper 119|mapper 119]] to this board.
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| == Overview ==
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| * PRG ROM size: 128 KB (DIP-28 Nintendo pinout)
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| * PRG ROM bank size: 8 KB
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| * PRG RAM: Up to 8 KB
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| * CHR capacity: 32 or 64 KB ROM (DIP-28 standard pinout) and 8 KB RAM [[Category:Mappers with CHR RAM]]
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| * CHR bank size: 1 KB and 2 KB
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| * Nametable [[mirroring]]: Controlled by mapper
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| * Subject to [[bus conflict]]s: No
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| == Registers ==
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| See [[MM3]]
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| === Bank data ($8001-$9FFF, odd) ===
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| Bit 6 of the CHR bank number is used to switch between the CHR ROM chip and the CHR RAM chip.
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| 7 bit 0
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| ---- ----
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| xCDD DDDD
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| ||| ||||
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| |++-++++- New bank value, based on last value written to Bank select register
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| | 0: Select 2 KB CHR bank at PPU $0000-$07FF (or $1000-$17FF);
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| | 1: Select 2 KB CHR bank at PPU $0800-$0FFF (or $1800-$1FFF);
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| | 2: Select 1 KB CHR bank at PPU $1000-$13FF (or $0000-$03FF);
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| | 3: Select 1 KB CHR bank at PPU $1400-$17FF (or $0400-$07FF);
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| | 4: Select 1 KB CHR bank at PPU $1800-$1BFF (or $0800-$0BFF);
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| | 5: Select 1 KB CHR bank at PPU $1C00-$1FFF (or $0C00-$0FFF);
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| | 6, 7: As standard MMC3
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| +-------- Chip select (for CHR banks)
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| 0: Select CHR ROM; 1: Select CHR RAM
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| Nintendo ''could'' have used bit 7 instead of bit 6, allowing 128 KiB of CHR ROM instead of 64 KiB. | |
| However, using bit 7 would have precluded a hypothetical "TQSROM" board combining TQROM-style ROM/RAM mixing with [[TLSROM]]-style single-screen mirroring.
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| Rare developed both games on this board, and Rare was also a big fan of single-screen mirroring on the [[AxROM]] boards.
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| == Hardware ==
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| A [[7432|74HC32]] IC controls the CHR RAM's enable line.
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| == References ==
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| *[http://kevtris.org/mappers/mmc3/NES_TQROM.html NES-TQROM] by Kevin Horton
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