Editing CP System II

{{Short description|1993 arcade system board}}
{{Infobox information appliance
| name = CP System II
| logo = Logo CP System II.svg
| image = 
| caption = 
| manufacturer = [[Capcom]]
| type = [[Arcade system board]]
| releasedate = {{Start date|1993|09|10}}
| discontinued = {{End date|2003|12|22}}
| input = 8-way [[joystick]], from 2 to 6 [[Button (control)|buttons]]
| cpu = [[68000|Motorola 68000]] (@ 16 MHz)
| display = [[Raster graphics|Raster]] (horizontal),<br />384×224 [[Display resolution|resolution]],<br />[[List of monochrome and RGB color formats#12-bit RGB|4096 colors]] on screen,<br />[[24-bit color|16,777,216-color]] [[List of color palettes|palette]]<ref name=system16/>
| sound = Sound  CPU: [[Zilog Z80|Z80]]  (@ 8 MHz) <br/> [[QSound|Q-Sound]] (@ 4 MHz)
| predecessor = [[CP System]]
| successor = [[CP System III]]
}}

The {{nihongo|'''CP System II'''|CPシステムII|CP shisutemu 2}}, also known as '''Capcom Play System 2'''<ref>{{cite book |title=Piracy of Intellectual Property on Peer-to-peer Networks |date=September 26, 2002 |publisher=[[U.S. Government Printing Office]] |isbn=978-0-16-069280-2 |page=141 |url=https://books.google.com/books?id=PglmV7hxSbEC&pg=PA141}}</ref> or '''CPS-2''', is an [[arcade system board]] that was the successor to [[Capcom]]'s [[CP System]], [[CP System Dash]] and [[Capcom Power System Changer]] arcade hardware. It was first used in 1993 for ''[[Super Street Fighter II]]'' and was succeeded by the [[CP System III]] hardware in [[1996 in video gaming|1996]], of which the CPS-2 would outlive by over four years. New releases for the system were produced until the end of 2003, ending with ''[[Hyper Street Fighter II]]''. Technical support for the CPS-2 ended on February 28, 2019.<ref name="csend2" />

Like its predecessor, games can be exchanged without altering the core hardware. The CP System II uses separate [[daughterboard]]s enclosed in plastic cases to store both the games and the main board on, which are then put together so that the games can be played. Unlike its predecessor, however, games are [[Encryption|encrypted]], and must be decrypted via a decryption key stored on the main board's battery-backed memory to run them.

==History==

Capcom announced the development of the CP System II (or CPS-2) in 1990. They had planned to complete and release the CP System II hardware in 18 months. They also originally had plans for the system to be capable of [[3D graphics]].<ref>{{cite magazine |title=Cover Story: "This Is the Good Time" – Capcom's CPS system brings success to the firm... and offers direction for a troubled video market |magazine=RePlay |date=April 1990 |volume=15 |issue=7 |publisher=RePlay Publishing |pages=183–5 |url=https://archive.org/details/re-play-volume-14-issue-no.-7-april-1990-600dpi/RePlay%20-%20Volume%2014%2C%20Issue%20No.%207%20-%20April%201990/page/183}}</ref>

The earlier Capcom [[Arcade system board|system board]], the original CP System (or CPS-1), while successful, was very vulnerable to bootleggers making [[Counterfeit|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 [[read-only memory|ROMs]] to prevent [[software piracy]]. Due to the encryption, the system was never bootlegged until unencrypted program data became available.{{cn|date=July 2019}}

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 [[ROM cartridge|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.{{cn|date=July 2019}}

The ''B'' boards hold battery-backed memory containing [[decryption key]]s 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<ref>{{cite web|url=http://cps2shock.emu-france.info/suicide.html|title=CPS-2 Shock|publisher=}}</ref> in-circuit, but this must be done before the original falls below 2V or the keys will be lost. Consequently, the board would just simply 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 [[Video game console emulator|emulation]] was next to impossible. However, in January 2001, the CPS-2 Shock group<ref>{{cite web|url=http://cps2shock.emu-france.info/wip.html|title=CPS-2 Shock|publisher=}}</ref> 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 image]]s, 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 [http://andreasnaive.blogspot.com/ Andreas Naive] ({{Webarchive|url=https://web.archive.org/web/20130702190633/http://andreasnaive.blogspot.com/ |date=2013-07-02 }}<ref>{{cite web|url=http://andreasnaive.blogspot.com/|title=Notas de Andy|publisher=|access-date=2007-01-04|archive-date=2013-07-02|archive-url=https://web.archive.org/web/20130702190633/http://andreasnaive.blogspot.com/|url-status=dead}}</ref>) and [[Nicola Salmoria]]. It has been determined that the encryption employs two four-round [[Feistel cipher]]s with a 64-bit key.<ref>[https://github.com/mamedev/mame/blob/master/src/mame/machine/cps2crypt.cpp MAME source - cps2crypt.cpp<!-- Bot generated title -->]</ref><ref>{{cite web|url=http://mamelife.blogspot.com/2007/01/cps2-getting-closer.html|title=Nicola's MAME Ramblings: CPS2 Getting Closer|first=Nicola|last=Salmoria|date=14 January 2007|publisher=}}</ref> 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 II security programming, enabling the clean "de-suicide" and restoration of any dead games without hardware modifications.<ref>{{cite web|url=http://arcadehacker.blogspot.com/2016/04/important-capcom-cps2-announcement.html|title=Arcade Hacker: Important Capcom CPS2 Announcement|first=Eduardo|last=Cruz|date=30 April 2016|publisher=}}</ref><ref>{{cite web|url=http://shoryuken.com/2016/05/10/cps2-board-security-successfully-reverse-engineered-allows-dead-arcade-boards-to-be-easily-resurrected/|title=CPS2 Board Security Successfully Reverse Engineered; Allows Dead Arcade Boards to be Easily Resurrected|date=10 May 2016|publisher=|access-date=22 May 2016|archive-date=18 May 2016|archive-url=https://web.archive.org/web/20160518101026/http://shoryuken.com/2016/05/10/cps2-board-security-successfully-reverse-engineered-allows-dead-arcade-boards-to-be-easily-resurrected/|url-status=dead}}</ref>

Capcom ceased manufacturing the CP System II hardware on December 22, 2003, with ''Hyper Street Fighter II'' being the final game released for the hardware. Capcom ended most of the technical support for the hardware and its games on March 31, 2015.<ref name="csend">{{cite web|url=https://www.capcom.co.jp/arcade/news/operator/20140930.html|title=弊社基板製品保守サービス業務終了のご案内|publisher=Capcom|date=2014-09-30|accessdate=2024-04-25}}</ref> Battery replacements ended on February 28, 2019,<ref name="csend2">{{cite web|url=https://www.capcom.co.jp/arcade/news/operator/201811.html|title=弊社製品のサービス対応終了に関するご案内|publisher=Capcom|date=2018-11-12|accessdate=2024-04-25}}</ref> ending all official support of the CP System II hardware and software.

==Region colors==

{| class="wikitable"
|-
! 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==
{{See also|CP System#Technical specifications|l1=CP System: Technical specifications}}

*[[Central processing unit|CPU]]:<ref name=mame>{{cite web|url=https://github.com/mamedev/mame/blob/master/src/mame/drivers/cps2.c |title=Mame/Cps2.c at master · mamedev/Mame · GitHub |website=[[GitHub]] |accessdate=2014-11-22 |url-status=dead |archiveurl=https://web.archive.org/web/20151105142542/https://github.com/mamedev/mame/blob/master/src/mame/drivers/cps2.c |archivedate=2015-11-05 }}</ref>
**Primary: Capcom DL-1525 ([[Encryption|encrypted]] [[Motorola 68000|68000]]) @ [[Clock rate|16 MHz]]
**Sound: Kabuki DL-030P (encrypted Z80, but encryption not used) or standard [[Zilog Z80|Z80]] @ 8 [[Megahertz|MHz]]
*[[Capcom]] custom chipset:<ref name=mame/>
**[[Graphics processing unit|GPU]]: CPS-A & CPS-B Graphics Processors @ 16&nbsp;MHz (same as [[CP System|CPS-1]])
**[[Sound chip]]: [[Lucent]] DL-1425 Q1 [[QSound]] DSP16A Processor @ 4&nbsp;MHz
**[[DRAM refresh|DRAM Refresh Controller]]: DL-2227
**[[Input/output|I/O Controller]]: DL-1123
*[[Video game graphics|Display]]:
**[[Display resolution|Active resolution]]: 384×224 [[pixel]]s<ref name=system16>{{cite web|url=http://www.system16.com/hardware.php?id=795|title=System 16 - CP System II (CPS2) Hardware (Capcom)|publisher=}}</ref>
**[[Overscan]] resolution: 512×262 (262 [[Scan line|scanlines]])<ref>{{cite web|url=https://github.com/mamedev/mame/blob/master/src/mame/includes/cps1.h|title=mamedev/mame|website=[[GitHub]] |publisher=}}</ref>
**[[Sprite (computer graphics)|Sprites]]: 900 on screen<ref name=system16/>
*Colors:
**[[Color depth|Depth]]: [[32-bit color|32-bit]]<ref name=system16/> ([[RGBA color space|RGBA]])
**[[List of color palettes|Palette]]: 16,777,216 colors ([[24-bit color|24-bit]])
**[[Alpha compositing|Alpha transparency]]: 256 levels ([[8-bit color|8-bit]])
**Colors on screen: 4096<ref name=system16/> ([[List of monochrome and RGB color formats#12-bit RGB|12-bit]])
**Colors per [[Tile engine|tile]]: 16 (4-bit)<ref name=system16/>
*[[Random-access memory|RAM]]: 1328&nbsp;[[Kilobyte|KB]] (1&nbsp;[[Megabyte|MB]] [[FPM DRAM]], 304&nbsp;KB [[Static random-access memory|SRAM]])
**A-Board: 1 MB FPM DRAM,<ref name=mame/><ref>{{cite web|url=http://www.questcomp.com/QuestDetails.aspx?pn=HM514260AJ-8|archive-url=https://archive.today/20141122235018/http://www.questcomp.com/QuestDetails.aspx?pn=HM514260AJ-8|url-status=dead|archive-date=November 22, 2014|title=HM514260AJ-8 - HM514260AJ8 - Quest Components, Inc. - Electronic Component Distributors - Resistor & Capacitor Distributors - Obsolete Electronic Components - Discrete Semiconductor Distributors - Integrated Circuit Distributors - Quest Components|publisher=}}</ref> 280&nbsp;KB SRAM (256 KB [[Video memory|video]], 16 KB I/O, 8 KB sound)<ref name=mame/>
**B-Board: 16&nbsp;KB SRAM (2× 8&nbsp;KB)<ref name=mame/>
**Communication Board: 8&nbsp;KB SRAM<ref name=mame/>
*Maximum [[Read-only memory|ROM]] capacity: 322&nbsp;[[Megabit|Mbit]]<ref name=system16/> (40.25&nbsp;MB)
*Dimensions (A+B board pair): 40 x 27 x 8&nbsp;cm

==List of games (42 games) ==
<!-- To edit the text of this article, skip past the table. --><!-- Dates given are the earliest possible dates shown in the game's bootup screen, any region. --><!-- There are rumors of a CPS-2 version of Pnickies ぷにっきいず and a prototype called Galum Pa! ぐるんぱ but they are not listed due to the lack of concrete information -->
{| class="wikitable sortable" style="width:auto"
|-
! English title
! Release date
! Developer
! Japanese title
! Genre
|-
| ''[[Super Street Fighter II|Super Street Fighter II: The New Challengers]]''<br />''[[Super Street Fighter II|Super Street Fighter II: Tournament Battle]]''
| 1993-09-10
| [[Capcom]]
| ''Super Street Fighter II''<br/>{{nihongo||スーパーストリートファイターII}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Eco Fighters]]''
| 1993-12-03
| [[Capcom]]
| ''Ultimate Ecology''<br/>{{nihongo||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''<br/>{{nihongo||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''<br/>{{nihongo||スーパーストリートファイターIIX}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Alien vs. Predator (arcade game)|Alien vs. Predator]]''
| 1994-05-20
| [[Capcom]]
| ''Alien VS Predator''<br/>{{nihongo||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''<br/>{{nihongo||ヴァンパイア -The Night Warriors-}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Saturday Night Slam Masters|Ring of Destruction: Slammasters II]]''
| 1994-08-08
| [[Capcom]]
| ''Super Muscle Bomber: The International Blowout''<br/>{{nihongo||スーパーマッスルボマー -THE INTERNATIONAL BLOWOUT-}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Armored Warriors]]''
| 1994-09-16
| [[Capcom]]
| ''Powered Gear: Strategic Variant Armor Equipment''<br/>{{nihongo||パワードギア -STRATEGIC VARIANT ARMOR EQUIPMENT-}}
| [[Beat 'em up]]
|-
| ''[[X-Men: Children of the Atom (video game)|X-Men: Children of the Atom]]''
| 1994-12-08
| [[Capcom]]
| ''X-Men: Children of the Atom''<br/>{{nihongo||(X-MEN Children of The Atom)}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Night Warriors: Darkstalkers' Revenge]]''
| 1995-03-02
| [[Capcom]]
| ''Vampire Hunter: Darkstalkers' Revenge''<br/>{{nihongo||ヴァンパイアハンター -Darkstalkers' Revenge-}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Cyberbots: Full Metal Madness]]''
| 1995-04-20
| [[Capcom]]
| ''Cyberbots: Full Metal Madness''<br/>{{nihongo||サイバーボッツ -FULL METAL MADNESS-}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Street Fighter Alpha]]''
| 1995-06-05
| [[Capcom]]
| ''Street Fighter Zero''<br/>{{nihongo||ストリートファイターZERO}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Mega Man: The Power Battle]]''
| 1995-09-22
| [[Capcom]]
| ''Rockman: The Power Battle''<br/>{{nihongo||ロックマン ザ・パワーバトル}}
| [[Fighting game]]
|-
| ''[[Marvel Super Heroes (video game)|Marvel Super Heroes]]''
| 1995-10-24
| [[Capcom]]
| ''Marvel Super Heroes''
| [[fighting game|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''<br/>{{nihongo||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''<br/>{{nihongo||ストリートファイターZERO2}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Super Puzzle Fighter II Turbo]]''
| 1996-05-29
| [[Capcom]]
| ''Super Puzzle Fighter II X''<br/>{{nihongo||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''<br/>{{nihongo||ロックマン2 ザ・パワーファイターズ}}
| [[Fighting game]]
|-
| ''[[Street Fighter Alpha 2#Arcade|Street Fighter Alpha 2 Gold]]''
| 1996-08-05
| [[Capcom]]
| ''Street Fighter Zero 2 Alpha''<br/>{{nihongo||ストリートファイターZERO2 ALPHA}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Quiz Nanairo Dreams|Quiz Nanairo Dreams: Nijiirochō no Kiseki]]''
| 1996-08-26
| [[Capcom]]
| ''Quiz Nanairo Dreams: Nijiirochō no Kiseki''<br/>{{nihongo||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''
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Battle Circuit]]''
| 1997-03-19
| [[Capcom]]
| ''Battle Circuit''<br/>{{nihongo||バトルサーキット}}
| [[Beat 'em up]]
|-
| ''[[Darkstalkers 3|Vampire Savior]]''
| 1997-05-19
| [[Capcom]]
| ''Vampire Savior: The Lord of Vampire''<br/>{{nihongo||ヴァンパイアセイヴァー -The Lord of Vampire-}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Marvel Super Heroes vs. Street Fighter]]''
| 1997-06-20
| [[Capcom]]
| ''Marvel Super Heroes vs. Street Fighter''
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Capcom Sports Club]]''
| 1997-07-22
| [[Capcom]]
| ''Capcom Sports Club''<br/>{{nihongo||カプコンスポーツクラブ}}
| [[Sports game]]
|-
| ''[[Super Gem Fighter Mini Mix]]''
| 1997-09-04
| [[Capcom]]
| ''Pocket Fighter''<br/>{{nihongo||ポケットファイター}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Darkstalkers|Vampire Hunter 2: Darkstalkers' Revenge]]''
| 1997-09-13
| [[Capcom]]
| ''Vampire Hunter 2: Darkstalkers' Revenge''<br/>{{nihongo||ヴァンパイアハンター2 -Darkstalkers' Revenge-}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Darkstalkers 3|Vampire Savior 2: The Lord of Vampire]]''
| 1997-09-13
| [[Capcom]]
| ''Vampire Savior 2: The Lord of Vampire''<br/>{{nihongo||ヴァンパイアセイヴァー2 -The Lord of Vampire-}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Marvel vs. Capcom: Clash of Super Heroes]]''
| 1998-01-12
| [[Capcom]]
| ''Marvel vs. Capcom: Clash of Super Heroes''
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Street Fighter Alpha 3]]''
| 1998-06-29
| [[Capcom]]
| ''Street Fighter Zero 3''<br/>{{nihongo||ストリートファイターZERO3}}
| [[fighting game|Head-to-Head Fighting Game]]
|-
| ''[[Giga Wing]]''
| 1999-02-22
| [[Takumi Corporation|Takumi]]
| ''Giga Wing''<br/>{{nihongo||ギガウイング}}
| [[Shoot 'em up]]
|-
| ''[[Jyangokushi: Haō no Saihai]]''
| 1999-05-27
| [[Capcom]]
| ''Jyangokushi: Haō no Saihai''<br/>{{nihongo||雀國志 覇王の采牌}}
| [[Puzzle game]]
|-
| ''[[Dimahoo]]''
| 2000-01-21
| [[Eighting|Eighting/Raizing]]
| ''Great Mahō Daisakusen''<br/>{{nihongo||グレート魔法大作戦}}
| [[Shoot 'em up]]
|-
| ''[[Mars Matrix: Hyper Solid Shooting]]''
| 2000-04-12
| [[Takumi Corporation|Takumi]]
| ''Mars Matrix''<br/>{{nihongo||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''
| [[Shoot 'em up]]
|-
| ''[[Mighty! Pang]]''
| 2000-10-10
| [[Mitchell Corporation|Mitchell]]
| ''Mighty Pang''<br/>{{nihongo||マイティ・パン}}
| [[Platform game|Platformer]]
|-
| ''[[Progear]]''
| 2001-01-17
| [[Cave (company)|Cave]]
| ''Progear no Arashi''<br/>{{nihongo||プロギアの嵐}}
| [[Shoot 'em up]]
|-
| ''[[Puzz Loop 2]]''
| 2001-02-05
| [[Mitchell Corporation|Mitchell]]
| ''Puzz Loop 2''<br/>{{nihongo||パズループ2}}
| [[Puzzle game]]
|-
| ''[[Janpai Puzzle Chōkō]]''
| 2001-08-20
| [[Mitchell Corporation|Mitchell]]
| ''Janpai Puzzle Chōkō''<br/>{{nihongo||雀牌パズル 長江}}
| [[Puzzle game]]
|-
| ''[[Hyper Street Fighter II|Hyper Street Fighter II: The Anniversary Edition]]''
| 2003-12-22
| [[Capcom]]
| ''Hyper Street Fighter II''<br/>{{nihongo||ハイパーストリートファイターII}}
| [[fighting game|Head-to-Head Fighting Game]]
|}
<!-- END OF TABLE -->

==See also==
* [[CP System]]
* [[CP System III]]

==References==
{{reflist|2}}

==External links==
* [https://web.archive.org/web/20110820194256/http://maws.mameworld.info/maws/mamesrc/src/mame/drivers/cps2.c Technical information in the MAME CPS-2 driver]
* [http://cps2shock.emu-france.info/techinfo.html CPS-2 Shock - Technical Information]
* [http://www.system16.com/hardware.php?id=795 CPS-2 at System 16 - The Arcade Museum]
* [http://www.jammaparts.com/keystonemod.htm CPS-2 Keystone Suicide Battery Retainer Mod - JAMMAPARTS.COM] {{Webarchive|url=https://web.archive.org/web/20110719102524/http://www.jammaparts.com/keystonemod.htm |date=2011-07-19 }}
* [http://www.uvlist.net/groups/compare/cps1-hw,cps2-hw,cps3-hw ''CPS-1, CPS-2 and CPS-3 releases comparison'']

[[Category:Capcom arcade system boards]]
[[Category:68k-based arcade system boards]]

[[de:Capcom Play System]]