As time passes, these batteries lose their charge and the games stop functioning, because the CPU cannot execute any code without the decryption keys. The B boards hold battery-backed memory containing decryption keys needed for the games to run. The exception to this is that the blue and green boards can be used together. CP System II A and B boards are color-coded by region, and each board can only be used with its same-colored mate. The relationship between the A and B board is basically the same as that between a home video game console and cartridge. The CP System II (CPシステムII shīpī shisutemu tsū?) or CPS-2 is an arcade system board that Capcom first used in 1993.The CP System II consists of two separate parts the A board, which connects to the JAMMA harness and contains components common between all CP System II games, and the B board, which contains the game itself.
