Sega Model 1
From Sega Retro
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| Sega Model 1 | |||||
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| Manufacturer: Sega | |||||
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The Sega Model 1 is an arcade system board released by Sega in 1992. It is the successor to the Sega System 32 arcade boards, and was succeeded by the Sega Model 2 series. It was Sega's first hardware designed for 3D polygon graphics.
Originally, the Model 1 was simply known as the CG Board, but was retroactively given the Model 1 name after work on the Model 2 began.
Contents
Hardware
It began development in 1990,[1] with Yu Suzuki's Sega AM2 team involved in its development from the drawing board.[2] The Model 1 was intended to compete with Namco's System 21; Namco was then the market leader in polygonal 3D video games, with titles such as Galaxian³ and Starblade.[3] The Model 1 was eventually released in 1992, debuting with Virtua Racing. While it was a significant improvement over the System 21, the Model 1 hardware was expensive, and only a few games were developed for the platform.
Contrary to popular opinion, Lockheed Martin was not involved with the development of the Model 1, but it was developed internally at Sega, before Lockheed Martin became involved with the development of the Sega Model 2, according to former Lockheed Martin employee, Real3D's Jon Lenyo, in 1998. [1]
Technical Specifications
- Board composition: CPU Board, Video Board, ROM Board, I/O Board, Comm Board, Sound Board, Motor Board, Amp Board [4]
- Main CPU: NEC V60 @ 16 MHz [5][6]
- Fixed-point arithmetic: 32-bit RISC instructions @ 3.5 MIPS
- Floating-point unit: 32-bit & 64-bit operations @ 16 MFLOPS
- Bus width: 32-bit
- Additional CPU: 3× Zilog Z80 @ 4 MHz (8-bit & 16-bit instructions @ 1.74 MIPS) [4]
- CPU for I/O Board, Comm Board and Motor Board
- DMA controllers: Fujitsu MB89374, Fujitsu MB89237A [4]
Sound
- Sound CPU: Toshiba TMP68000N-10 (68000) @ 12 MHz [4]
- Sound chips: 2× Sega 315-5560 Custom MultiPCM
- Audio capabilities: 28 PCM channels per chip (one for music, one for sound effects), 56 PCM channels total
- Sound timer: Yamaha YM3834 @ 8 MHz
Graphics
- GPU: [4][7]
- Geometrizer coprocessors: 5× Fujitsu TGP MB86233 DSP [8] @ 16 MHz (FPU, ALU) [9]
- Coprocessor abilities: Floating decimal point operation function, axis rotation operation function, 3D matrix operation function, DMA, T&L (transform, clipping, lighting) [10]
- Fixed-point arithmetic: 32-bit instructions @ 80 MIPS (16 MIPS each)
- Floating-point unit: 32-bit operations @ 80 MFLOPS (16 MFLOPS each)
- Bus width: 32-bit
- Rasterizer board: Sega 837-7894 171-6080D Video PCB @ 36 MHz
- Sega Custom chipset: 315-5422, 315-5423, 315-5424, 315-5425, 315-5292
- Geometrizer coprocessors: 5× Fujitsu TGP MB86233 DSP [8] @ 16 MHz (FPU, ALU) [9]
- Display resolution: 496×384 pixels, 24 kHz H-Sync, progressive scan (non-interlaced) [4]
- Overscan resolution: 656×496 pixels
- Frame rate: 30–60 frames/sec
- Color palette: 16,777,216 (16-bit high color depth and 256 luminance levels) [7]
- Colors on screen: 190,464 (496×384)
- Graphical capabilities: Shading, flat shading, diffuse reflection, specular reflection, 2 layers of background scrolling, alpha blending, alpha channel, lighting [7]
- Geometric performance: 180,000 polygons/sec (with all effects), 540,000 vectors/sec
- Rendering fillrate: 36 million pixels/sec
Memory
- Memory: Up to 38,142 KB (5984 KB main, 23,646 KB video, 8512 KB audio)
- System RAM: 2776 KB (1896 KB high-speed SRAM) [4]
- Main RAM: 480 KB (at least 156 KB SRAM)
- VRAM: 2232 KB (at least 1464 KB SRAM)
- CPU Board: 768 KB (128 KB display lists, 576 KB tiles, 64 KB color)
- Video Board: 1464 KB SRAM
- Audio RAM: 64 KB (16 KB SRAM)
- Internal DSP cache: 30 KB (6 KB per DSP) [9]
- Game ROM: Up to 35,336 KB (5504 KB main, 21,384 KB video,[13] 8448 KB audio)[14]
Bandwidth
List of Sega Model 1 Games
- Virtua Racing (1992)
- Star Wars Arcade (1993)
- Virtua Fighter (1993)
- Wing War (1994)
- Sega VR-1 (1994)
- Dennoo Senki Net Merc (1995)
Gallery
Unit
Amplifier PCB
Communication PCB
CPU
Input/Output PCB
Sound PCB
Video PCB
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