The ZX/SAM ROM CART is an ZX ROM cartridge featuring 16 banks of memory (via a flash memory chip) for storing ZX Cartridge ROMS. Works with Interface 2 (and compatible interfaces) on the ZX Spectrum and via the ZX-ECUTOR on the SAM Coupe.
On the SAM it allows 32k ROMs to be used and can also be written to via the SAM.