Difference between revisions of "Sega System 2"

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| processor=[[Zilog Z80]]
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| arcade_date_world=1985-09
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| releases={{releasesArcade
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| system_date_world=1985-09
 
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The '''Sega System 2''' is an arcade platform introduced by [[Sega]] in 1985. While it is a successor to the [[Sega System 1]], it is in fact largely an upgrade, utilising the same [[Z80]] CPU and the same sound chips. The major upgrades of the System 2 are the addition of a ROM board, faster RAM, and a larger 512×512 background scrolling plane.
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The '''Sega System 2''' (セガ システム 2) is an [[arcade]] platform introduced by [[Sega]] in 1985. It is a successor to the [[Sega System 1]], though largely an upgrade, utilising the same [[Zilog Z80]] CPU, sound chips, and Sega graphics chipset. The major upgrades of the System 2 are the addition of a ROM board, faster [[RAM]], and a larger 512×512 background scrolling plane.
  
 
The System 2 was supported alongside the System 1, with its last game being released in 1988.
 
The System 2 was supported alongside the System 1, with its last game being released in 1988.
  
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==Technical Specifications==
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==Technical specifications==
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* Board composition: Main board & ROM board
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:''See [[Sega System 1#Technical specifications|Sega System 1 Specifications]] for details on underlying System 1 specifications.''
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* Main CPU: [[Zilog Z80]] @ 4 MHz (8-bit & 16-bit instructions @ 0.58 [[wikipedia:Instructions per second|MIPS]])
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* Sound CPU: Zilog Z80 @ 4 MHz (8-bit & 16-bit instructions @ 0.58 MIPS)
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The following are changes that System 2 made to System 1 specifications.
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* [[wikipedia:Sound chip|Sound chips]]: Sega [[SN76489|SN76496]] @ 4 MHz, Sega SN76496 @ 2 MHz
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* GPU chipset:
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* Board composition: Main board + [[ROM]] board
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** Sega 315-5011 sprite line comparator
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* [[Tile Layer|Tilemap]] planes: 2 background layers (1 static, 1 scrolling), 8×8 tiles
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** Sega 315-5012 sprite generator
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:* Tilemap sizes: 512×512 for scrolling plane, 256×256 for fixed plane{{ref|https://github.com/mamedev/mame/tree/master/src/mame/video/system1.cpp}}
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** 315-5049 tilemap chip
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* [[wikipedia:Microcontroller|MCU]]: Intel 8751{{ref|https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp}}
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===Memory===
 
{{multicol|
 
{{multicol|
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* [[RAM]]: 82 [[Byte|KB]], including 32.5 KB high-speed [[SRAM]] (Static RAM){{ref|https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp}}
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* Memory: 385.5–487.5 KB (100–106 KB main, 251.5–347.5 KB video, 34 KB sound)
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** Main: 4 KB
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* [[RAM]]: 32.5 [[Byte|KB]] ([[SRAM]]){{ref|https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp}}
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** [[VRAM|Video]]: 12 KB (4 KB video, 2 KB sprites, 2 KB palette, 4 KB collision)
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:* Main: 4 KB
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** Sound: 2 KB
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:* [[VRAM|Video]]: 26.5 KB (4 KB video, 2 KB [[sprite]] attributes, 1.5 KB sprite line buffers, 2 KB palette, 4 KB collision)
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** MCU: 64 KB
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:* Sound: 2 KB
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* Video resolution: 256×224 (display), 640×260 (overscan)
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* [[ROM]]: 353–455 KB
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** Refresh rate: 60.0952 Hz (V-sync)
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:* Main: 96–102 KB
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* [[Palette|Color palette]]: 4096
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:* Video: 225–321 KB (96 KB tiles, 128–224 KB sprites, 1 KB palette)
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** Colors on screen: 2048
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:* Sound: 32 KB
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* [[Tile Layer|Tilemap]] planes: 2 background layers (1 static, 1 scrolling), 8×8 tiles
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}}
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** Tilemap sizes: 512×512 for scrolling plane and 256×256 for fixed plane{{ref|https://github.com/mamedev/mame/tree/master/src/mame/video/system1.cpp}}
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* [[Sprite]]s: Dual line buffers, double buffering, 32 sprites per scanline, 16 colors per sprite, sprite flipping, hardware collision detection
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==List of games==
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** Sprite sizes: 8 to 256 pixels width, 8 to 256 pixels height
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{{BulletPointGameList|SYS2}}
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** Pixel clock cycles: 10 MHz (60.0952 Hz refresh rate)
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** Sprite pixel/texel fillrate: 10 million pixels/texels per second, 166,402 pixels/texels per frame (260 scanlines), 640 sprite pixels/texels per scanline
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==Production credits==
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{{creditstable|
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*[[Hiroshi Yagi]]
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| source=Developer mentions{{ref|https://web.archive.org/web/20210205150032/https://www.4gamer.net/games/999/G999905/20210126043/}}
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| console=Arcade
 
}}
 
}}
  
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==Gallery==
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==Photo gallery==
 
<gallery>
 
<gallery>
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File:System2 PCB.jpg|PCB
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System2 PCB.jpg|PCB
 
</gallery>
 
</gallery>
  
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==List of Games==
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==References==
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{{multicol|
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<references/>
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* ''[[Heavy Metal]]'' (1985)
 
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* ''[[Choplifter]]'' (1985)
 
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* ''[[Shooting Master]]'' (1985)
 
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* ''[[119]]'' (1986)
 
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* ''[[Warball]]'' (1986)
 
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* ''[[Wonder Boy]]'' (also released on [[Sega System 1]]) (1986)
 
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* ''[[Dakkochan House]]'' (1987)
 
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* ''[[Toki no Senshi: Chrono Soldier]]'' (1987)
 
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* ''[[Wonder Boy in Monster Land]]'' (1987)
 
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* ''[[UFO Senshi Youko Chan]]'' (1988)
 
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}}
 
  
 
{{Sega Arcade Boards}}
 
{{Sega Arcade Boards}}
 
[[Category:Sega System series]]
 
[[Category:Sega System series]]

Latest revision as of 05:01, 10 November 2023

System2 PCB.jpg
Sega System 2
Manufacturer: Sega
Release Date RRP Code
Arcade
World		 ? ?




































The Sega System 2 (セガ システム 2) is an arcade platform introduced by Sega in 1985. It is a successor to the Sega System 1, though largely an upgrade, utilising the same Zilog Z80 CPU, sound chips, and Sega graphics chipset. The major upgrades of the System 2 are the addition of a ROM board, faster RAM, and a larger 512×512 background scrolling plane.

The System 2 was supported alongside the System 1, with its last game being released in 1988.

Technical specifications

See Sega System 1 Specifications for details on underlying System 1 specifications.

The following are changes that System 2 made to System 1 specifications.

  • Board composition: Main board + ROM board
  • Tilemap planes: 2 background layers (1 static, 1 scrolling), 8×8 tiles
  • Tilemap sizes: 512×512 for scrolling plane, 256×256 for fixed plane[1]

Memory

  • Memory: 385.5–487.5 KB (100–106 KB main, 251.5–347.5 KB video, 34 KB sound)
  • RAM: 32.5 KB (SRAM)[2]
  • Main: 4 KB
  • Video: 26.5 KB (4 KB video, 2 KB sprite attributes, 1.5 KB sprite line buffers, 2 KB palette, 4 KB collision)
  • Sound: 2 KB
  • ROM: 353–455 KB
  • Main: 96–102 KB
  • Video: 225–321 KB (96 KB tiles, 128–224 KB sprites, 1 KB palette)
  • Sound: 32 KB

List of games

Production credits

Source:
Developer mentions[3]


Photo gallery

  • PCB

References

  1. ↑ https://github.com/mamedev/mame/tree/master/src/mame/video/system1.cpp
  2. ↑ https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp
  3. ↑ https://www.4gamer.net/games/999/G999905/20210126043/ (Wayback Machine: 2021-02-05 15:00)


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