Comparison of Nintendo mappers

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This article compares the capabilities of several Nintendo mappers.

Discrete logic

All of Nintendo's discrete logic mappers have bus conflicts except some revisions of 7.

iNES Chips Boards Max PRG PRG banks Max CHR CHR banks Mirroring PRG RAM? IRQ
0 0-1 NROM 32 8 V/H hardwired Japan only None
2 2 UNROM, UOROM 256 16 + 16F 8 V/H hardwired No None
3 1 CNROM 32 32 8 V/H hardwired No None
7 1-2 AxROM 256 32 8 1 No None
13 3 CPROM (U) 32 16 4 + 4F V/H hardwired No None
34 1 BNROM 256 32 8 V/H hardwired No None
66 1 GNROM, MHROM 128 32 32 8 V/H hardwired No None
180 2 UNROM 256 16F + 16 8 V/H hardwired No None

ASIC

None of these ASIC mappers has bus conflicts.

iNES Mapper Boards Max PRG ROM PRG ROM banks Max CHR CHR banks Mirroring PRG RAM? Assist
1 MMC1 SGROM, SNROM, SUROM 512 16 + 16F; 32 8 4 + 4 V/H/1 switchable Optional None
1 MMC1 SKROM, SLROM 256 16 + 16F; 32 128 4 + 4 V/H/1 switchable Optional None
4 MMC3 TxROM 512 8 + 8 + 16F 256 2 + 2 + 1 + 1 + 1 + 1 V/H switchable Optional Scanline IRQ
4 MMC3 TGROM, TNROM 512 8 + 8 + 16F 8 2 + 2 + 1 + 1 + 1 + 1 V/H switchable Japan only Scanline IRQ
118 MMC3 TKSROM, TLSROM 512 8 + 8 + 16F 128 2 + 2 + 1 + 1 + 1 + 1 Any switchable Optional Scanline IRQ
119 MMC3 TQROM 128 8 + 8 + 16F 64 + 8 2 + 2 + 1 + 1 + 1 + 1 V/H switchable No Scanline IRQ
4 MMC6 HKROM 512 8 + 8 + 16F 256 2 + 2 + 1 + 1 + 1 + 1 V/H switchable 1KiB built-in; US and Europe only Scanline IRQ
5 MMC5 ExROM 1024 32, 16 + 16, 16 + 8 + 8, 8 + 8 + 8 + 8 1024 BG: 4, 2 + 2, or 1 + 1 + 1 + 1
Sprites: 8, 4 + 4, 2 * 4, or 1 * 8
Split window: 4
Any 1 KiB built in; more optional Scanline IRQ
Smaller attribute areas
Separate CHR bank per background tile
Separate sets of CHR banks for sprites
Vertical split screen
8x8 multiplier
9 MMC2 PNROM 128 8 + 24F 128 4/4 + 4/4 V/H switchable No Tile triggered CHR bank switching
10 MMC4 FJROM, FKROM (J) 256 16 + 16F 128 4/4 + 4/4 V/H switchable Yes Tile triggered CHR bank switching

External links

  • Mapper wizard: Web-based decision tree for choosing a mapper for your NES project