[[File:Multicart8Rom.jpg|thumbnail|assembled]][[File:Multicart8RomPcb.jpg|thumbnail|PCB]]
An GX4000 / Amstrad Plus cartridge typically holds a ROM/EPROM with 128KB, 256KB or 512KB of data. E.g. all original GX4000 games were using 128K ROMs but more recent released games often need more storage and can hold up to 512K, like e.g. "La Culotte de Zelda".