Difference between revisions of "Sega System 1"

From Sega Retro
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* Sound CPU: Zilog Z80 @ 4 MHz (8/16-bit instructions, 0.58 MIPS)
 
* Sound CPU: Zilog Z80 @ 4 MHz (8/16-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
 +
* [[wikipedia:Microcontroller|MCU]]: Intel 8751{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 +
}}
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====Graphics====
 +
{{multicol|
 
* Graphics chipset:{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 
* Graphics chipset:{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 
** Sega 315-5011 sprite line comparator
 
** Sega 315-5011 sprite line comparator
 
** Sega 315-5012 sprite generator
 
** Sega 315-5012 sprite generator
 
** Sega 315-5049 tilemap generator
 
** Sega 315-5049 tilemap generator
−
* [[wikipedia:Microcontroller|MCU]]: Intel 8751{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 
−
* [[RAM]]: 82 [[Byte|KB]]{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 
−
** Main: 4 KB
 
−
** [[VRAM|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 (active), 640×260 ([[wikipedia:Overscan|overscan]]){{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 
* Video resolution: 256×224 (active), 640×260 ([[wikipedia:Overscan|overscan]]){{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 
** Scanlines: 260 (224 active, 36 [[wikipedia:Vertical blanking interval|VBlank]])
 
** Scanlines: 260 (224 active, 36 [[wikipedia:Vertical blanking interval|VBlank]])
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* Background planes: 2 [[Tile Layer|tilemap]] layers (1 static, 1 scrolling), 8×8 tiles{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/video/system1.cpp System1 / System 2 video hardware (MAME)]}}{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 
* Background planes: 2 [[Tile Layer|tilemap]] layers (1 static, 1 scrolling), 8×8 tiles{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/video/system1.cpp System1 / System 2 video hardware (MAME)]}}{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 
** Tilemap sizes: 256×256 for both planes
 
** Tilemap sizes: 256×256 for both planes
 +
}}
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 +
====Memory====
 +
{{multicol|
 +
* Memory: 154.25 [[Byte|KB]] (52 KB main, 92.25 KB video, 10 KB sound)
 +
* [[RAM]]: 18 KB{{ref|[https://github.com/mamedev/mame/blob/master/src/mame/drivers/system1.cpp Sega System 1 / System 2 (MAME)]}}
 +
** Main: 4 KB
 +
** [[VRAM|Video]]: 12 KB (4 KB video, 2 KB sprites, 2 KB palette, 4 KB collision)
 +
** Sound: 2 KB
 +
* [[ROM]]: 136.25 KB (48 KB main, 80.25 KB video, 8 KB sound){{ref|[http://www.mamedb.com/game/starjack Star Jacker (MAME)]}}
 
}}
 
}}
  

Revision as of 20:36, 5 October 2016

System1 PCB1.jpg
Sega System 1
Manufacturer: Sega
Release Date RRP Code

The Sega System 1 is an arcade platform officially debuted by Sega in 1983,[1] based on earlier 1982 prototype hardware. It is a Z80-based platform and the first in the decade-long "System" series of arcade boards.

The System 1 was a relatively popular arcade board for its day, supported not only by Sega, but by Japanese developers Coreland and VIC Tokai between 1983 and 1987. In 1985 it was succeeded by the slightly more powerful Sega System 2 board, though new games were released for both systems concurrently. Many of the System 1's games were ported to the SG-1000 and Sega Master System consoles.

Specifications

System 1

  • Board composition: One board
    • Master clock rate: 19.99982 MHz
  • Main CPU: Zilog Z80 @ 4 MHz (8/16-bit instructions, 0.58 MIPS)
  • Sound CPU: Zilog Z80 @ 4 MHz (8/16-bit instructions, 0.58 MIPS)
  • Sound chips: Sega SN76496 @ 4 MHz, Sega SN76496 @ 2 MHz
  • MCU: Intel 8751[2]

Graphics

  • Graphics chipset:[2]
    • Sega 315-5011 sprite line comparator
    • Sega 315-5012 sprite generator
    • Sega 315-5049 tilemap generator
  • Video resolution: 256×224 (active), 640×260 (overscan)[2]
    • Scanlines: 260 (224 active, 36 VBlank)
    • Pixel clock rate: 9.99991 MHz (3.446099 MHz active, 6.55381 MHz HBlank/VBlank)
    • Refresh rate: 60.0952 Hz (VSync)
  • Color palette: 4096[3]
    • Colors on screen: 2048[2]
  • Sprite plane: Line buffer, double buffering, 32 sprites on screen, 16 colors per sprite, sprite flipping, hardware collision detection[3][2]
    • Sprite sizes: 8×8 to 256×224 texels
    • Line buffer fillrate: 6.55381 MPixels/s
    • Texels per scanline: 384 (active scanlines) to 640 (VBlank scanlines)
    • Sprites per scanline: 32
  • Background planes: 2 tilemap layers (1 static, 1 scrolling), 8×8 tiles[3][2]
    • Tilemap sizes: 256×256 for both planes

Memory

  • Memory: 154.25 KB (52 KB main, 92.25 KB video, 10 KB sound)
  • RAM: 18 KB[2]
    • Main: 4 KB
    • Video: 12 KB (4 KB video, 2 KB sprites, 2 KB palette, 4 KB collision)
    • Sound: 2 KB
  • ROM: 136.25 KB (48 KB main, 80.25 KB video, 8 KB sound)[4]

Prototype

Super Locomotive in 1982 ran on prototype arcade hardware that was very similar to the Sega System 1 later released in 1983. Super Locomotive had largely identical specifications, but with the following differences:[5][6][7]

  • Graphics chipset:
    • Sega 315-5011 sprite line comparator
    • Sega 315-5012 sprite generator
  • Video resolution: 248×224 (active), 256×256 (overscan)
    • Pixel clock rate: 4 MHz
    • Refresh rate: 60 Hz
  • Color palette: 1568
    • Colors on screen: 768
  • Sprite plane:

Gallery

  • PCB 1

  • PCB 2

List of Games

References

  1. ↑ 1983 Timeline (Sega Corporation)
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Sega System 1 / System 2 (MAME)
  3. ↑ 3.0 3.1 3.2 System1 / System 2 video hardware (MAME)
  4. ↑ Star Jacker (MAME)
  5. ↑ Super Locomotive (MAME)
  6. ↑ Super Locomotive video hardware (MAME)
  7. ↑ Sega Z80 Based Hardware (System 16)


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