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 is in fact largely identical, utilising the same [[Z80]] CPU and the same sound chips. The only major differences between the System 1 and the System 2 is the addition of a ROM board 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. 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, improved 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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* Sound CPU: Zilog Z80 @ 4 MHz (8-bit & 16-bit instructions @ 0.58 MIPS)
 
* Sound CPU: Zilog Z80 @ 4 MHz (8-bit & 16-bit instructions @ 0.58 MIPS)
 
* [[wikipedia:Sound chip|Sound chips]]: Sega [[SN76489|SN76496]] @ 4 MHz, Sega SN76496 @ 2 MHz
 
* [[wikipedia:Sound chip|Sound chips]]: Sega [[SN76489|SN76496]] @ 4 MHz, Sega SN76496 @ 2 MHz
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* GPU chipset: Sega 315-5011 (sprite line comparator), Sega 315-5012 (sprite generator), 315-5049 (tilemap chip)
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* GPU chipset:
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** Sega 315-5011 sprite line comparator
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** Sega 315-5012 sprite generator
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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.c}}
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* [[RAM]]: 287.5 [[Byte|KB]] high-speed [[SRAM]] (Static RAM) [https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.c][http://de.utsource.net/product/index?keyWords=CXK5808-50&id=1711964]
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** Main: 4 KB
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** [[VRAM|Video]]: 12 KB (4 KB video, 2 KB sprites, 2 KB palette, 4 KB collision)
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** Sound: 2 KB
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** MCU: 64 KB
 
* Video resolution: 256×224 (display), 640×260 (overscan)
 
* Video resolution: 256×224 (display), 640×260 (overscan)
 
** Refresh rate: 60.0952 Hz (V-sync)
 
** Refresh rate: 60.0952 Hz (V-sync)

Revision as of 23:26, 10 October 2015

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. 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, improved 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

  • Board composition: Main board & ROM board
  • Main CPU: Zilog Z80 @ 4 MHz (8-bit & 16-bit instructions @ 0.58 MIPS)
  • Sound CPU: Zilog Z80 @ 4 MHz (8-bit & 16-bit instructions @ 0.58 MIPS)
  • Sound chips: Sega SN76496 @ 4 MHz, Sega SN76496 @ 2 MHz
  • GPU chipset:
    • Sega 315-5011 sprite line comparator
    • Sega 315-5012 sprite generator
    • 315-5049 tilemap chip
  • MCU: Intel 8751[1]
  • RAM: 287.5 KB high-speed SRAM (Static RAM) [1][2]
    • Main: 4 KB
    • Video: 12 KB (4 KB video, 2 KB sprites, 2 KB palette, 4 KB collision)
    • Sound: 2 KB
    • MCU: 64 KB
  • Video resolution: 256×224 (display), 640×260 (overscan)
    • Refresh rate: 60.0952 Hz (V-sync)
  • Color palette: 4096
    • Colors on screen: 2048
  • Tilemap planes: 2 background layers (1 static, 1 scrolling), 8×8 tiles
    • Tilemap sizes: 512×512 for scrolling plane and 256×256 for fixed plane[2]
  • Sprites: Dual line buffers, double buffering, 32 sprites per scanline, 16 colors per sprite, sprite flipping, hardware collision detection
    • Sprite sizes: 8 to 256 pixels width, 8 to 256 pixels height
    • Pixel clock cycles: 10 MHz (60.0952 Hz refresh rate)
    • Sprite pixel/texel fillrate: 10 million pixels/texels per second, 166,402 pixels/texels per frame (260 scanlines), 640 sprite pixels/texels per scanline

Gallery

  • PCB

List of Games


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