Similar, but not solely contained in a cartridge: Nintendo Family Computer Network https://en.wikipedia.org/wiki/Family_Computer_Network_System https://en.wik

Similar, but not solely contained in a cartridge: Nintendo Family Computer Network https://en.wikipedia.org/wiki/Family_Computer_Network_System https://en.wikipedia.org/wiki/Family_Computer_Network_System and the Nintendo Satellaview which did things similar to the SEGA Channel. https://en.wikipedia.org/wiki/Satellaview https://en.wikipedia.org/wiki/Satellaview