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Overscan resolution: 512×262 (262 scanlines).

Sound chip: Lucent DL-1425 Q1 QSound DSP16A Processor 4 MHz.

GPU: CPS-A & CPS-B Graphics Processors 16 MHz (same as CPS-1).

Sound: Kabuki DL-030P (encrypted Z80, but encryption not used) or standard Z80 8 MHz.

In April 2016, Eduardo Cruz, Artemio Urbina and Ian Court announced the successful reverse engineering of Capcom's CP System 2 security programming, enabling the clean 'de-suicide' and restoration of any dead games without hardware modifications. The algorithm was thereafter implemented in this state for all known CPS-2 games in MAME. It has been determined that the encryption employs two four-round Feistel ciphers with a 64-bit key. In January 2007, the encryption method was fully reverse-engineered by Andreas Naive and Nicola Salmoria. However, in January 2001, the CPS-2 Shock group 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 in-circuit, but this must be done before the original falls below 2V or the keys will be lost.Ĭonsequently, the board would just die anyway, meaning even if used legally it would not play after a finite amount of time (Unless a fee was paid to Capcom to replace it).ĭue to the heavy encryption, it was believed for a long time that CP System II emulation was next to impossible. This is known to hobbyists as the 'suicide battery'.

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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 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. Due to the encryption, the system was never bootlegged until unencrypted program data became available.

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In order to rectify the situation, Capcom took the CP System hardware (with QSound) with minimal changes and employed encryption on the program ROMs to prevent software piracy. The earlier Capcom system board, the original CP System (or CPS-1), while successful, was very vulnerable to bootleggers making unauthorized copies of the games. The arcade system had new releases for it until the end of 2003, ending with Hyper Street Fighter II. It was the successor to their previous CP System and Capcom Power System Changer arcade hardware and was succeeded by the CP System III hardware in 1996, of which the CPS-2 would outlive by over four years. 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 for Super Street Fighter II.

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