Sega Model 1

Sega Model 1
Manufacturer: Sega
Release Date RRP Code

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.

Hardware

It began development in 1990, and released in 1992. 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. 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 actually 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 Real3D's Jon Lenyo (and former Lockheed Martin employee) in 1998.

Technical Specifications

• Main CPU: NEC V60 @ 16 MHz
  • Fixed-point arithmetic: 32-bit RISC instructions @ 3.5 MIPS (million instructions per second)
  • Floating-point unit: 32-bit and 64-bit operations
• Graphics board: Sega 837-7894 171-6080D VIDEO PCB
• GPU coprocessors: 5× Fujitsu TGP MB86233 (geometrizer, rasterizer, DSP, FPU)
  • Coprocessor abilities: Floating decimal point operation function, axis rotation operation function, 3D matrix operation function
  • Floating-point unit: 32-bit operations @ 16 MFLOPS (Mega-FLOPS) each (80 MFLOPS combined)
• Sound CPU: Motorola 68000 @ 12 MHz
• 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
• RAM: 1936 KB (1880 KB SRAM)
  • Main SRAM: 408 KB
  • Video memory: 1464 KB SRAM (192 KB display list, 576 KB tiles, 64 KB colors)
  • Audio memory: 64 KB (8 KB SRAM)
• Monitor display resolution: 496×384 pixels, 24 kHz horizontal sync, 60 Hz refresh rate, progressive scan (non-interlaced)
• Frame rate: 60 frames per second
• Color palette: 16,777,216 (16-bit high color depth and 256 luminance levels)
• 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
• Geometric performance: 180,000 polygons/sec (with all effects), 540,000 vectors/sec
• Rendering fillrate: 72 million pixels/sec (1.2 million pixels/frame)

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

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  Unit

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  Amplifier PCB

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  Communication PCB

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  CPU

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  Input/Output PCB

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  Sound PCB

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  Video PCB

Sega arcade boards
Originating in arcades
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Console-based hardware
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PC-based hardware
05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Lindbergh Europa-R RingEdge RingWide RingEdge 2 Nu Nu 1.1 Nu 2 ALLS