Certain arcade games (such as "Steel Gunner" and others based on Namco System 2) use a dual 68000 CPU configuration, and systems with a triple 68000 CPU configuration also exist (such as "Galaxy Force" and others based on the Sega Y Board), along with a quad 68000 CPU configuration, which has been used by Jaleco (one 68000 for sound has a lower clock rate compared to the other 68000 CPUs) for games such as "Big Run" and "Cisco Heat"; another, fifth 68000 (at a different clock rate than the other 68000 CPUs) was used in the Jaleco arcade game "Wild Pilot" for input/output (I/O) processing.