Sega Model 1

From Sega Retro

Model1 board.jpg
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,[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

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

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)
      • CPU Board: 324 KB (320 KB main, 4 KB comm)
      • Comm Board: 12 KB SRAM (8 KB SRAM, 4 KB Dual-Port SRAM) [11][12]
      • Other boards: 144 KB SRAM (128 KB ROM Board, 8 KB I/O Board, 8 KB Motor Board)
    • 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

  • System RAM bandwidth: 477 MB/sec [4]
    • Main RAM: 65.939767 MB/sec
      • CPU Board: 54.495675 MB/sec (32-bit, 14.285714 MHz) [9]
      • Other boards: 11.444092 MB/sec (3× 8-bit, 4 MHz) [15][16][12]
    • VRAM: 391.873446 MB/sec
      • CPU Board: 305.175781 MB/sec (5× 32-bit, 16 MHz) [17]
      • Video Board: 86.697665 MB/sec (5× 18.181818 MHz) [17]
    • Audio RAM: 19.073486 MB/sec (16-bit, 10 MHz) [15]

List of Sega Model 1 Games

Gallery


Sega arcade boards
Originating in arcades









Console-based hardware








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PC-based hardware








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