• Capcom Play System 2 Emulator
• Psp Capcom Play System 1 & 2 Emulator
• Capcom Play System 2 Emulator

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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. 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 arcade system had new releases for it until the end of 2003, ending with Hyper Street Fighter II.

History[edit]

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. 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. Due to the encryption, the system was never bootlegged until unencrypted program data became available.^{[citation needed]}

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. The relationship between the A and B board is very similar to that between a home video game console and cartridge. 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 exception to this is that the blue and green boards can be used together.^{[citation needed]}

The B boards hold battery-backed memory containing decryption keys needed for the games to run. As time passes, these batteries lose their charge and the games stop functioning, because the CPU cannot execute any code without the decryption keys. This is generally referred to as a 'suicide battery'. 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. Consequently the board would die, even if used legally it would not play after a finite amount of time unless a fee was paid to Capcom to replace it.

Due to the heavy encryption, it was believed for a long time that CP System II emulation was next to impossible. 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.

In January 2007, the encryption method was fully reverse-engineered by Andreas Naive^[4] and Nicola Salmoria. It has been determined that the encryption employs two four-round Feistel ciphers with a 64-bit key.^[5][6] The algorithm was thereafter implemented in this state for all known CPS-2 games in MAME.

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.^[7][8]

Region colors[edit]

Technical specifications[edit]

• CPU:^[9]
  • Primary: Capcom DL-1525 (encrypted68000) @ 16 MHz
  • Sound: Kabuki DL-030P (encrypted Z80, but encryption not used) or standard Z80 @ 8 MHz
• Capcom custom chipset:^[9]
  • GPU: CPS-A & CPS-B Graphics Processors @ 16 MHz (same as CPS-1)
  • Sound chip: Lucent DL-1425 Q1 QSound DSP16A Processor @ 4 MHz
  • DRAM Refresh Controller: DL-2227
  • I/O Controller: DL-1123
• Display:
  • Active resolution: 384×224 pixels^[1]
  • Overscan resolution: 512×262 (262 scanlines)^[10]
  • Sprites: 900 on screen^[1]
• Colors:
  • Depth: 32-bit^[1] (RGBA)
  • Palette: 16,777,216 colors (24-bit)
  • Alpha transparency: 256 levels (8-bit)
  • Colors on screen: 4096^[1] (12-bit)
  • Colors per tile: 16 (4-bit)^[1]
• RAM: 1328 KB (1 MBFPM DRAM, 304 KB SRAM)
  • A-Board: 1 MB FPM DRAM,^[9][11] 280 KB SRAM (256 KB video, 16 KB I/O, 8 KB sound)^[9]
  • B-Board: 16 KB SRAM (2× 8 KB)^[9]
  • Communication Board: 8 KB SRAM^[9]
• Maximum ROM capacity: 322 Mbit^[1] (40.25 MB)
• Dimensions (A+B board pair): 40 x 27 x 8 cm

List of games (42 games)[edit]

See also[edit]

References[edit]

Capcom Play System 2 Emulator

1. ^ ^abcdefg'System 16 - CP System II (CPS2) Hardware (Capcom)'.
2. ^'CPS-2 Shock'.
3. ^'CPS-2 Shock'.
4. ^'Notas de Andy'.
5. ^MAME source - cps2crypt.cpp
6. ^Salmoria, Nicola (14 January 2007). 'Nicola's MAME Ramblings: CPS2 Getting Closer'.
7. ^Cruz, Eduardo (30 April 2016). 'Arcade Hacker: Important Capcom CPS2 Announcement'.
8. ^'CPS2 Board Security Successfully Reverse Engineered; Allows Dead Arcade Boards to be Easily Resurrected'. 10 May 2016.
9. ^ ^abcdef'Archived copy'. Archived from the original on 2015-11-05. Retrieved 2014-11-22.CS1 maint: archived copy as title (link)
10. ^'mamedev/mame'.
11. ^'HM514260AJ-8 - HM514260AJ8 - Quest Components, Inc. - Electronic Component Distributors - Resistor & Capacitor Distributors - Obsolete Electronic Components - Discrete Semiconductor Distributors - Integrated Circuit Distributors - Quest Components'.

External links[edit]

• CPS-2 Keystone Suicide Battery Retainer Mod - JAMMAPARTS.COMArchived 2011-07-19 at the Wayback Machine

Psp Capcom Play System 1 & 2 Emulator

Capcom Play System 2 Emulator