This thin cartridge is the predecessor to the HuCards found in Hudson Soft's PC Engine and TurboGrafix-16 consoles. Made for the MSX in Japan, Hudson cut its teeth on these kinds of peripherals at the same time Sega was making a similar technology -- MyCards -- for their SG-1000 series of video game consoles. Both required an intermediary cartridge to play on the intended systems. BeeCards worked with BeePaks, while MyCards worked with the Card Catcher, or plugged in directly to the Sega Mark III and Sega Master System.