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.
Development
It began development in 1990,[1] 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.[2] 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.
Technical Specifications
- Main CPU: NEC V60 @ 16 MHz
- Fixed-point arithmetic: 32-bit RISC[3] instructions @ 3.5 MIPS (million instructions per second)[4][5]
- Floating-point unit: 32-bit and 64-bit operations[6]
- Graphics board: Sega 837-7894 171-6080D VIDEO PCB[7]
- GPU coprocessors: 5× Fujitsu TGP MB86233[8] (geometrizer, rasterizer,[9] DSP, FPU)
- Coprocessor abilities: Floating decimal point operation function, axis rotation operation function, 3D matrix operation function[3]
- Floating-point unit: 32-bit operations @ 16 MFLOPS (Mega-FLOPS)[3][10] each (80 MFLOPS combined)
- Sound CPU: Motorola 68000 @ 12 MHz[3]
- Sound chips: 2× Sega 315-5560 Custom MultiPCM[3]
- 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)[7]
- 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,[7] 60 Hz refresh rate, progressive scan (non-interlaced)
- Frame rate: 60 frames per second[11]
- Color palette: 16,777,216 (16-bit high color depth[3] and 256 luminance levels)[9]
- 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,[3] lighting[9]
- Geometric performance: 180,000 polygons/sec (with all effects), 540,000 vectors/sec[3]
- Rendering fillrate: 1,200,000 pixels/sec[3]
List of Sega Model 1 Games
- Star Wars Arcade (1993)
- Virtua Racing (1992)
- Virtua Fighter (1993)
- Wing War (1994)
Gallery
Unit
Amplifier PCB
Communication PCB
CPU
Input/Output PCB
Sound PCB
Video PCB
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