DxROM

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The generic designation DxROM refers to cartridge boards made by Nintendo that use the seemingly-identical Namco 108, 109, 118 or 119 mappers. Nintendo did not manufacture the Famicom counterparts. The iNES format assigns Mapper 206 to DxROM.

The following DxROM boards are known to exist:

Board PRG ROM CHR ROM
DEROM 64 KiB 32,64 KiB ROM
DE1ROM 128 KiB 64 KiB
DRROM 128 KiB 64 KiB

The Famicom counterparts:

Board PRG ROM CHR ROM
3401, 3417, 3451 32 KiB 32 KiB
3405, 3415 128 KiB 32 KiB
3406, 3416 128 KiB 64 KiB
3407 32 KiB 16,32 KiB
3413 64 KiB 32 KiB
3414 64 KiB 64 KiB
3425 128 KiB 32 KiB
3433, 3443 128 KiB 128 KiB
3446 128 KiB 128 KiB
3453 128 KiB 128 KiB

Otherwise, the Namco 108 family is just a subset of MMC3

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