Difference between revisions of "Sega System 2"

From Sega Retro
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The '''Sega System 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.
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The '''Sega System 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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See ''[[Sega System 1#Specifications|Sega System 1 Specifications]]'' for details on underlying System 1 specifications. The following are changes that System 2 made to System 1 specifications.
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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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* Board composition: Main Board + [[ROM]] Board
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The following are changes that System 2 made to System 1 specifications.
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* Board composition: Main board + [[ROM]] board
 
* [[Tile Layer|Tilemap]] planes: 2 background layers (1 static, 1 scrolling), 8×8 tiles
 
* [[Tile Layer|Tilemap]] planes: 2 background layers (1 static, 1 scrolling), 8×8 tiles
 
** 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}}
 
** 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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** [[VRAM|Video]]: 26.5 KB (4 KB video, 2 KB [[sprite]] attributes, 1.5 KB sprite line buffers, 2 KB palette, 4 KB collision)
 
** [[VRAM|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
 
** Sound: 2 KB
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* [[ROM]]: 353–455 KB{{ref|[http://mamedb.com/game/hvymetal Heavy Metal (MAME)]}}{{ref|[http://mamedb.com/game/shtngmst Shooting Master]}}
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* [[ROM]]: 353–455 KB
 
** Main: 96–102 KB
 
** Main: 96–102 KB
 
** Video: 225–321 KB (96 KB tiles, 128–224 KB sprites, 1 KB palette)
 
** Video: 225–321 KB (96 KB tiles, 128–224 KB sprites, 1 KB palette)
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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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==List of games==
 
{{multicol|
 
{{multicol|
 
* ''[[Heavy Metal]]'' (1985)
 
* ''[[Heavy Metal]]'' (1985)

Revision as of 20:38, 25 July 2017

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

The Sega System 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

Photo gallery

  • PCB

List of games

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


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