JxROM

The generic designation JxROM refers to cartridge boards made by Nintendo of Europe that use the Sunsoft FME-7 mapper IC. These boards are the European counterpart to boards manufactured by Sunsoft that used the FME-7, including several Famicom boards and the North American NES-BTR. The iNES format assigns Mapper 69 to JxROM.

Nintendo manufactured these JxROM boards for the European market:

Board	PRG ROM	PRG RAM	CHR	comments
JLROM	256 KiB		128 KiB ROM
JSROM	128 KiB	8 KiB (no battery)	256 KiB ROM	Nintendo's clone of BTR

Sunsoft manufactured the Famicom counterparts:

Board	PRG ROM	PRG RAM	CHR	comments
BAT-E301	128 KiB		128 KiB ROM
BBW-E301	128 KiB	8 KiB (battery)	256 KiB ROM
FC-DBT	128 KiB	8 KiB (no battery)	256 KiB ROM	FC counterpart of BTR
DD2-E301	256 KiB	8 KiB (battery)	256 KiB ROM
FC-GMK	256 KiB		128 KiB ROM	expansion sound
GRM-E301	128 KiB		256 KiB ROM
PYK-E301	128 KiB		128 KiB ROM