The Interton Video 2000 was a first-generation German home video game console marketed in 1975. It is one of the earliest European systems to use interchangeable cartridges, although these were technologically very different from later ROM cartridges. The console had no microprocessor and used CMOS electronic circuitry to generate the basic game elements, while each cartridge contained additional circuitry that configured the corresponding game mode and could generate extra graphical elements. The cartridge itself also acted on the power circuit, so inserting it switched the console on. Five commercially released cartridges are known: Sparring, Badminton, Attacke, Tennis and Super-Tennis. Its architecture represents a particularly interesting intermediate stage between the earliest dedicated-circuit consoles and later programmable systems using ROM cartridges.