Sega Y Board
From Sega Retro
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| Sega Y Board | |||||
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| Manufacturer: Sega | |||||
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The Sega Y Board is an arcade system board released by Sega in 1988 as a successor to the Sega X Board. Like the X Board before it, the Y Board was known for its sprite manipulation capabilities.
The Y Board is quite different to the X Board in terms of design, offering a third CPU and more advanced video equipment. Most notably, the Y Board allows for real-time rotation of sprites as well as scaling. Unusually, the system uses no tile layers, so graphics are rendered using only sprites (a design taken by SNK for their Neo-Geo hardware in 1990).
Technical Specifications
- CPUs: 3 x MC68000 @ 12.5 MHz
- The first 68000 ("main" in MAME) has access to the sound hardware, I/O hardware, and 64KB RAM
- The second 68000 ("subx" in MAME) has access to the ysprites hardware, backup RAM and 16KB RAM
- The third 68000 ("suby" in MAME) has access to the bsprites hardware, ysprites full plane rotation, bsprites palette RAM, and 64KB RAM
- The three CPUs share 64KB of separate RAM for communication as well as the multiplier/divider hardware
- Sound CPU: Z80 @ 4 MHz with 2KB RAM
- Sound chip: YM2151 4 MHz & SegaPCM @ 15.625 MHz
- Display resolution: 320 x 224
- Board composition: CPU board and video board
- Video hardware:
- Two sprite planes with fixed Z-order
- Lower sprite plane ("ysprites" in MAME): full scaling and rotation; also the entire plane can be rotated as a whole
- Palettes are stored alongside the sprite table; sprite table entries hold a pointer to the palette, which itself is stored as an table of palette indirection values(?)
- Higher sprite plane ("bsprites" in MAME): standard Sega System 16B sprite plane
List of Games
- G-LOC Air Battle (1990)
- Galaxy Force (1988)
- Galaxy Force II (1988)
- Power Drift (1988)
- Rail Chase (1991)
- Strike Fighter (1991)
Gallery
PCB (top)
PCB (bottom)
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