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Simultaneously displayable: 256 (per scanlines).

Onscreen colors: 3072 (192 global palettes with 16 colors each).Color Depth: 16-bit (12-bit RGB with 4-bit brightness value).Primary: Motorola 68000 10 MHz (some later boards 12 MHz).The CPS hardware was also utilized in Capcom's unsuccessful attempt at home console market penetration, the CPS Changer, a domestic version of the CPS similar to SNK's Neo Geo AES. This problem was virtually eliminated by Capcom in the later CPS-2. In particular, there were so many bootleg versions of Street Fighter II, that they were more common in some countries than the official version. The system was plagued by many bootleg versions of its games. The algorithm was thereafter implemented in this state for all known CPS-2 games in MAME.īy using this site, you agree to the Terms of Use and Privacy Policy.After a number of arcade game boards designed to run only one game, Capcom embarked upon a project to produce an arcade system board that could be used to run multiple games, in order to reduce hardware costs and make the system more appealing to arcade operators.

It has been determined that the encryption employs two four-round Feistel ciphers with a 64-bit key.

However, in January 2001, the CPS-2 Shock group 3 was able to obtain unencrypted program data by hacking into the hardware, which they distributed as XOR difference tables to produce the unencrypted data from the original ROM images, making emulation possible, as well as restoring cartridges that had been erased because of the suicide system. It is possible to bypass the original battery and swap it out with a new one 2 in-circuit, but this must be done before the original falls below 2V or the keys will be lost. The exception to this is that the blue and green boards can be used together.Īs time passes, these batteries lose their charge and the games stop functioning, because the CPU cannot execute any code without the decryption keys. The relationship between the A and B board is very similar to that between a home video game console and cartridge.ĬP System II A and B boards are color-coded by region, and each board can only be used with its same-colored mate. Due to the encryption, the system was never bootlegged until unencrypted program data became available.