CP System II

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.

CP System II
ManufacturerCapcom
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

History

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.

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.

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 known to hobbyists as the "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 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).

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
RegionCaseVersion screen
JapanGreen plasticWhite text
U.S.A.Blue plasticRed text
Euro/Etc./WorldBlue plasticBlue text
AsiaGrey plasticYellow text
HispanicOrange plasticGreen text
BrazilOrange plasticMagenta text
OceaniaBlue plasticOrange text
Rental (any of above)Yellow plastic(Any of above)
(Any of above)Black metal "all-in-one"(Any of above)

Technical specifications
See also: CP System: Technical specifications

List of games
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
(スーパーストリートファイターII)		 Head-to-Head Fighting Game
Eco Fighters 1993-12-03 Capcom Ultimate Ecology
(アルティミットエコロジー)		 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
(スーパーストリートファイターIIX)		 Head-to-Head Fighting Game
Alien vs. Predator 1994-05-20 Capcom Alien VS Predator
(エイリアンVSプレデター)		 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
(スーパーマッスルボマー -THE INTERNATIONAL BLOWOUT-)		 Head-to-Head Fighting Game
Armored Warriors 1994-09-16 Capcom Powered Gear: Strategic Variant Armor Equipment
(パワードギア -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
(サイバーボッツ -FULL METAL MADNESS-)		 Head-to-Head Fighting Game
Street Fighter Alpha 1995-06-05 Capcom Street Fighter Zero
(ストリートファイター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)		 Platformer
Marvel Super Heroes 1995-10-24 Capcom Marvel Super Heroes
(MARVEL SUPER HEROES)		 Head-to-Head Fighting Game
19XX: The War Against Destiny 1995-12-07 Capcom 19XX The War Against Destiny
(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
(ストリートファイターZERO2)		 Head-to-Head Fighting Game
Super Puzzle Fighter II Turbo 1996-05-29 Capcom Super Puzzle Fighter II X
(スーパーパズルファイターIIX)		 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)		 Platformer
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
(X-MEN VS. STREET FIGHTER)		 Head-to-Head Fighting Game
Battle Circuit 1997-03-19 Capcom Battle Circuit
(バトルサーキット)		 Beat 'em up
Vampire Savior: The Lord of Vampire 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
(MARVEL SUPER HEROES VS. STREET FIGHTER)		 Head-to-Head Fighting Game
Capcom Sports Club 1997-07-22 Capcom Capcom Sports Club
(カプコンスポーツクラブ)		 Sports game
Super Gem Fighter Mini Mix 1997-09-04 Capcom Pocket Fighter
(ポケットファイター)		 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
(MARVEL VS. CAPCOM CLASH OF SUPER HEROES)		 Head-to-Head Fighting Game
Street Fighter Alpha 3 1998-06-29 Capcom Street Fighter Zero 3
(ストリートファイターZERO3)		 Head-to-Head Fighting Game
Giga Wing 1999-02-22 Takumi Giga Wing
(ギガウイング)		 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
(グレート魔法大作戦)		 Shoot 'em up
Mars Matrix: Hyper Solid Shooting 2000-04-12 Takumi Mars Matrix
(マーズマトリックス)		 Shoot 'em up
1944: The Loop Master 2000-06-20 Eighting/Raizing 1944 The Loop Master
(1944 THE LOOP MASTER)		 Shoot 'em up
Mighty! Pang 2000-10-10 Mitchell Mighty Pang
(マイティ・パン)		 Platformer
Progear 2001-01-17 Cave Progear no Arashi
(プロギアの嵐)		 Shoot 'em up
Puzz Loop 2 2001-02-05 Mitchell Puzz Loop 2
(パズループ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
(ハイパーストリートファイターII)		 Head-to-Head Fighting Game
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See also

References
  1. "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. "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".
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