CP System II

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CP System II
Release dateSeptember 10, 1993 (1993-09-10)
DiscontinuedDecember 22, 2003 (2003-12-22)
CPUMotorola 68000 (@ 16 MHz)
DisplayRaster (horizontal),
384×224 resolution,
4096 colors on screen,
16,777,216-color palette[1]
Input8-way joystick, from 2 to 6 buttons

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.


The earlier Capcom system board, the original CP System (or CPS-1), while successful, was very vulnerable to bootleggers making unauthorized copies of 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]

Capcom announced the development of the CPS2 in 1990. They had planned to complete and release the CPS2 in 18 months. They also originally had plans for the system to be capable of 3D graphics.[2]

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[3] 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[4] 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[5] and Nicola Salmoria. It has been determined that the encryption employs two four-round Feistel ciphers with a 64-bit key.[6][7] 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.[8][9]

Region colors[edit]

Region Case Version screen
Japan Green plastic White text
U.S.A. Blue plastic Red text
Euro/Etc./World Blue plastic Blue text
Asia Grey plastic Yellow text
Hispanic Orange plastic Green text
Brazil Orange plastic Magenta text
Oceania Blue plastic Orange text
Rental (any of above) Yellow plastic (Any of above)
(Any of above) Black metal "all-in-one" (Any of above)

Technical specifications[edit]

List of games (42 games)[edit]

English title Release date Developer Japanese title Genre
Super Street Fighter II: The New Challengers
Super Street Fighter II: Tournament Battle
1993-09-10 Capcom Super Street Fighter II
Head-to-Head Fighting Game
Eco Fighters 1993-12-03 Capcom Ultimate Ecology
Shoot 'em up
Dungeons & Dragons: Tower of Doom 1994-01-13 Capcom Dungeons & Dragons: Tower of Doom
(ダンジョンズ&ドラゴンズ タワーオブドゥーム)
Beat 'em up
Super Street Fighter II Turbo 1994-02-23 Capcom Super Street Fighter II X: Grand Master Challenge
Head-to-Head Fighting Game
Alien vs. Predator 1994-05-20 Capcom Alien VS Predator
Beat 'em up
Darkstalkers: The Night Warriors 1994-07-05 Capcom Vampire: The Night Warriors
(ヴァンパイア -The Night Warriors-)
Head-to-Head Fighting Game
Ring of Destruction: Slammasters II 1994-08-08 Capcom Super Muscle Bomber: The International Blowout
Head-to-Head Fighting Game
Armored Warriors 1994-09-16 Capcom Powered Gear: Strategic Variant Armor Equipment
Beat 'em up
X-Men: Children of the Atom 1994-12-08 Capcom X-Men: Children of the Atom
((X-MEN Children of The Atom))
Head-to-Head Fighting Game
Night Warriors: Darkstalkers' Revenge 1995-03-02 Capcom Vampire Hunter: Darkstalkers' Revenge
(ヴァンパイアハンター -Darkstalkers' Revenge-)
Head-to-Head Fighting Game
Cyberbots: Full Metal Madness 1995-04-20 Capcom Cyberbots: Full Metal Madness
Head-to-Head Fighting Game
Street Fighter Alpha 1995-06-05 Capcom Street Fighter Zero
Head-to-Head Fighting Game
Mega Man: The Power Battle 1995-09-22 Capcom Rockman: The Power Battle
(ロックマン ザ・パワーバトル)
Marvel Super Heroes 1995-10-24 Capcom Marvel Super Heroes Head-to-Head Fighting Game
19XX: The War Against Destiny 1995-12-07 Capcom 19XX The War Against Destiny Shoot 'em up
Dungeons & Dragons: Shadow over Mystara 1996-02-06 Capcom Dungeons & Dragons: Shadow over Mystara
(ダンジョンズ&ドラゴンズ シャドーオーバーミスタラ)
Beat 'em up
Street Fighter Alpha 2 1996-02-27 Capcom Street Fighter Zero 2
Head-to-Head Fighting Game
Super Puzzle Fighter II Turbo 1996-05-29 Capcom Super Puzzle Fighter II X
Puzzle game
Mega Man 2: The Power Fighters 1996-07-08 Capcom Rockman 2: The Power Fighters
(ロックマン2 ザ・パワーファイターズ)
Street Fighter Alpha 2 Gold 1996-08-05 Capcom Street Fighter Zero 2 Alpha
(ストリートファイターZERO2 ALPHA)
Head-to-Head Fighting Game
Quiz Nanairo Dreams: Nijiirochō no Kiseki 1996-08-26 Capcom Quiz Nanairo Dreams: Nijiirochō no Kiseki
(クイズなないろDREAMS 虹色町の奇跡)
Quiz game
X-Men vs. Street Fighter 1996-09-09 Capcom X-Men vs. Street Fighter Head-to-Head Fighting Game
Battle Circuit 1997-03-19 Capcom Battle Circuit
Beat 'em up
Darkstalkers 3 1997-05-19 Capcom Vampire Savior: The Lord of Vampire
(ヴァンパイアセイヴァー -The Lord of Vampire-)
Head-to-Head Fighting Game
Marvel Super Heroes vs. Street Fighter 1997-06-20 Capcom Marvel Super Heroes vs. Street Fighter Head-to-Head Fighting Game
Capcom Sports Club 1997-07-22 Capcom Capcom Sports Club
Sports game
Super Gem Fighter Mini Mix 1997-09-04 Capcom Pocket Fighter
Head-to-Head Fighting Game
Vampire Hunter 2: Darkstalkers' Revenge 1997-09-13 Capcom Vampire Hunter 2: Darkstalkers' Revenge
(ヴァンパイアハンター2 -Darkstalkers' Revenge-)
Head-to-Head Fighting Game
Vampire Savior 2: The Lord of Vampire 1997-09-13 Capcom Vampire Savior 2: The Lord of Vampire
(ヴァンパイアセイヴァー2 -The Lord of Vampire-)
Head-to-Head Fighting Game
Marvel vs. Capcom: Clash of Super Heroes 1998-01-12 Capcom Marvel vs. Capcom: Clash of Super Heroes Head-to-Head Fighting Game
Street Fighter Alpha 3 1998-06-29 Capcom Street Fighter Zero 3
Head-to-Head Fighting Game
Giga Wing 1999-02-22 Takumi Giga Wing
Shoot 'em up
Jyangokushi: Haō no Saihai 1999-05-27 Capcom Jyangokushi: Haō no Saihai
(雀國志 覇王の采牌)
Puzzle game
Dimahoo 2000-01-21 Eighting/Raizing Great Mahō Daisakusen
Shoot 'em up
Mars Matrix: Hyper Solid Shooting 2000-04-12 Takumi Mars Matrix
Shoot 'em up
1944: The Loop Master 2000-06-20 Eighting/Raizing 1944 The Loop Master Shoot 'em up
Mighty! Pang 2000-10-10 Mitchell Mighty Pang
Progear 2001-01-17 Cave Progear no Arashi
Shoot 'em up
Puzz Loop 2 2001-02-05 Mitchell Puzz Loop 2
Puzzle game
Janpai Puzzle Chōkō 2001-08-20 Mitchell Janpai Puzzle Chōkō
(雀牌パズル 長江)
Puzzle game
Hyper Street Fighter II: The Anniversary Edition 2003-12-22 Capcom Hyper Street Fighter II
Head-to-Head Fighting Game

See also[edit]


  1. ^ a b c d e f g "System 16 - CP System II (CPS2) Hardware (Capcom)".
  2. ^ "Cover Story: "This Is the Good Time" – Capcom's CPS system brings success to the firm... and offers direction for a troubled video market". RePlay. Vol. 15, no. 7. RePlay Publishing. April 1990. pp. 183–5.
  3. ^ "CPS-2 Shock".
  4. ^ "CPS-2 Shock".
  5. ^ "Notas de Andy".
  6. ^ MAME source - cps2crypt.cpp
  7. ^ Salmoria, Nicola (14 January 2007). "Nicola's MAME Ramblings: CPS2 Getting Closer".
  8. ^ Cruz, Eduardo (30 April 2016). "Arcade Hacker: Important Capcom CPS2 Announcement".
  9. ^ "CPS2 Board Security Successfully Reverse Engineered; Allows Dead Arcade Boards to be Easily Resurrected". 10 May 2016. Archived from the original on 18 May 2016. Retrieved 22 May 2016.
  10. ^ a b c d e f "Mame/Cps2.c at master · mamedev/Mame · GitHub". GitHub. Archived from the original on 2015-11-05. Retrieved 2014-11-22.
  11. ^ "mamedev/mame". GitHub.
  12. ^ "HM514260AJ-8 - HM514260AJ8 - Quest Components, Inc. - Electronic Component Distributors - Resistor & Capacitor Distributors - Obsolete Electronic Components - Discrete Semiconductor Distributors - Integrated Circuit Distributors - Quest Components".[permanent dead link]

External links[edit]