Difference between revisions of "Sega X Board"
From Sega Retro
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** Main graphics chips: 315-5197 tilemap generator, 315-5211A sprite generator, 315-5242 color encoder, 315-5275 road generator, 315-5278 sprite ROM bank control | ** Main graphics chips: 315-5197 tilemap generator, 315-5211A sprite generator, 315-5242 color encoder, 315-5275 road generator, 315-5278 sprite ROM bank control | ||
** Math chips: 315-5248 hardware multiplier, 315-5249 hardware divider | ** Math chips: 315-5248 hardware multiplier, 315-5249 hardware divider | ||
| − | * Video resolution: 320×224 (display), 400×262 (overscan), progressive scan | + | * Video resolution: 320×224 (display), 400×262{{ref|http://cgfm2.emuviews.com/txt/loftech.txt}}{{ref|https://github.com/mamedev/mame/tree/master/src/mame/drivers/segaxbd.c}} (overscan), progressive scan |
* Refresh rate: 59.6368 to 60Hz (V-sync) | * Refresh rate: 59.6368 to 60Hz (V-sync) | ||
* Frame rate: 59.6368 to 60 frames per second | * Frame rate: 59.6368 to 60 frames per second | ||
Revision as of 23:38, 21 February 2015
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| Sega X Board | |||||
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| Manufacturer: Sega | |||||
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The Sega X Board is an arcade system board released by Sega in 1987 as a successor to Sega OutRun hardware. It debuted with After Burner and Thunder Blade.
The X Board specification is largely similar to that of the OutRun Hardware board, but allows for twice as many sprites on screen at once, twice as many tile layers, and sprite rotation effects. The contents have also been condensed onto a single board, making it slightly easier to manufacture.
The X Board would be succeeded by the Y Board and System 32, before the Model 1 made true 3D arcade games more financially affordable.
Hardware
As the third in Sega's Super Scaler series of arcade hardware (after the Sega Hang-On hardware and Sega OutRun hardware), it was noteworthy for its sprite manipulation capabilities, which allowed it to create high quality pseudo-3D visuals, such as the scaling and rotating environments in 1987's After Burner, and the ray casting like environments in 1988's Last Survivor. This trend would continue with the Y Board and the System 32, before the Model 1 made true polygonal 3D arcade games more financially affordable.
Technical Specifications
- CPU:
- Sound chips:
- Graphics processing unit: Sega Super Scaler chipset @ 50MHz
- Main graphics chips: 315-5197 tilemap generator, 315-5211A sprite generator, 315-5242 color encoder, 315-5275 road generator, 315-5278 sprite ROM bank control
- Math chips: 315-5248 hardware multiplier, 315-5249 hardware divider
- Video resolution: 320×224 (display), 400×262[1][2] (overscan), progressive scan
- Refresh rate: 59.6368 to 60Hz (V-sync)
- Frame rate: 59.6368 to 60 frames per second
- Board composition: Single board
- Color palette: 98,304
- Sega's 16-bit arcade color palette: 15-bit RGB high color depth (32,768 colors) and 1-bit shadow & highlight that triples up to 98,304 colors.
- Colors on screen: 24,576
- Graphical planes:
- 4 tile layers
- 1 text layer
- 1 sprite layer with hardware sprite zooming
- 1 road layer, can draw 2 roads at once
- Translucent shadows
- Sprite capabilities: Dual sprite framebuffers, 512×256 framebuffer resolution, hardware sprite zooming, sprite rotation, thousands of sprites scaled per second, ray casting[3]
- Sprite size: 8×8 to 512×256 pixels
- Colors per sprite: 16
- Sprites per frame: 256 on screen at one time
- Sprite pixels/texels: 50MHz video clock cycles, 833,333 (60Hz) to 838,408 (59.6368Hz) pixels/texels per frame (262 scanlines), 3180 to 3200 sprite pixels/texels per scanline, 256 sprites per scanline
Super Monaco GP (1989) added the following upgrades:
- Additional boards: Network board, sound board, motor board
- Additional CPU: 2× Zilog Z80 @ 8MHz (2.32MIPS)
- Additional sound CPU: Zilog Z80 @ 4MHz (0.58MIPS)
- Additional sound chip: SegaPCM @ 4MHz (additional 16 PCM channels, totalling 32 PCM channels)
- Sound output: 4-channel surround sound
List of Games
- AB Cop (1990)
- After Burner (1987)
- After Burner II (1987)
- Caribbean Boule (1992)
- GP Rider (1990)
- Last Survivor (1989)
- Line of Fire (1989)
- Racing Hero (1990)
- Super Monaco GP (1989)
- Thunder Blade (1987)
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