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Sega System 2

From Sega Retro

System2 PCB.jpg
Fast facts on Sega System 2
Manufacturer: Sega
Main processor: Zilog Z80
Release Date RRP Code
Arcade
World
1985-09  ?



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[3][4]
    • Main: 96–102 KB
    • Video: 225–321 KB (96 KB tiles, 128–224 KB sprites, 1 KB palette)
    • Sound: 32 KB

Gallery

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
  3. Heavy Metal (MAME)
  4. Shooting Master
Sega Arcade Boards
Originating in Arcades
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VIC Dual System 1 System 24 NAOMI
VCO Object LaserDisc Aurora
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System 16
OutRun System 32
Gigas
Y Board
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