Sega Model 3

Sega Model 3
Manufacturer: Sega
Release Date RRP Code

The Sega Model 3 is an arcade platform produced by Sega. It is a successor to the Sega Model 2 platform, and was released in 1996.

The Model 3 hardware is very different to the Model 1 and Model 2 boards which preceded it. The Model 3 used dual Real3D/PRO-1000 graphics processors as its GPU, designed by Lockheed Martin in partnership with Mitsubishi. The Model 3 was designed to push as many textured polygons as possible in real-time, along with the most advanced graphical techniques available at the time, such as multisample anti-aliasing, motion blur, facial animation, specular highlighting/reflection/shading, and multiple light sources. Upon release, the Model 3 board was more powerful than any other arcade platform on the market, as well as any home console or computer at the time; it took several years for home systems to catch-up to the Model 3.

The Model 3 was succeeded by the Sega NAOMI in 1998, followed by the Sega Hikaru in 1999 and Sega NAOMI 2 in 2000.

History

The Model 3 board went through a series of delays which frustrated Sega. Despite success with the Model 2 arcade hardware, Lockheed Martin, mainly responsible for the graphics processors, were unable to finalise the specifications of the GPU, Real3D/Pro-1000, until late 1995 or early 1996. Lockheed Martin partnered with Mitsubishi, which provided two 3D-RAM chips as the GPU's core ALU unit and graphics memory. Sega had planned to release the board in late 1995 along with three games, one of which, Indy 500, was reportedly downgraded to Model 2 hardware thanks to the troubles. In late 1995, Yu Suzuki promised the Model 3 would deliver "the best 3D graphics". When the Model 3 specification was finalized, it used two Real3D/Pro-1000 processors, including four 3D-RAM chips. The Model 3 eventually debuted, with Virtua Fighter 3 as its first game, at the AOU Show 1996 in February 1996, and was followed by Scud Race later that year. The board was officially supported until 1999, to make room for the Sega NAOMI and its successors, the Sega Hikaru and NAOMI 2.

The Model 3 went through a number of revisions (steps) in which improvements were made the system and board architecture was changed. These "steppings" mainly increased the clock speed of the CPU and the speed of the 3D engine, as well as minor changes to the board architecture. Step 1.0 and Step 1.5 released in 1996, Step 2.0 in 1997, and Step 2.1 in 1998. Though there was much talk of Model 3 games being ported to the Sega Saturn, all home ports of Model 3 games were seen on the Sega Dreamcast, including the likes of Sega Rally 2, Virtua Fighter 3tb, Virtual-On Oratorio Tangram and Virtua Striker 2.

It was the most powerful game system in its time, an order of magnitude more powerful than PC graphics cards from 1998, which were still producing Model 2 quality graphics, two years years after the Model 3's release. By 2000, the Sega Model 2 & 3 had sold over 200,000 arcade systems worldwide, making them some of the best-selling arcade game boards of all time. At around $15,000 each (for the Model 2, with the Model 3 costing higher), this amounts to at least over $3 billion revenue from cabinet sales, equivalent to over $4.9 billion in 2014.

From the early 1970s, arcades had been at the forefront of graphical technology in video games. The Model 3 hardware as well as competitors from this era were also leading the industry from a graphical perspective at the time, compared to PCs which were still producing Model 2 quality graphics in 1998, but the gap began to slowly narrow after that, as PCs would begin to benefit from hardware accelerated graphics towards the end of the decade. Beginning with the co-development of the Sega Dreamcast console and Sega NAOMI arcade system, both released in 1998, consoles and later PCs would slowly become the basis for arcade systems, rather than the reverse as it had been up until this point. The last proprietary Sega arcade systems would be the Sega Hikaru and Sega NAOMI 2, after which PCs would overtake arcade systems as the forefront of graphical technology. Today, arcade games are built primarily around controls and the experience one gets from a game as opposed to graphical potential. Complex motion cabinets, and large, unique forms of control unsuitable for households is what drives the arcade industry in the present day.

Technical Specifications

• Board Composition: CPU + VIDEO + ROM boards
• Main CPU: IBM-Motorola PowerPC 603e (32-bit & 64-bit instructions)
  • Step 1.0: 66 MHz (93.4 MIPS, 132 MFLOPS)
  • Step 1.5: 100 MHz (142 MIPS, 200 MFLOPS)
  • Step 2.0: PowerPC 603R @ 166 MHz (498 MIPS, 332 MFLOPS)
• Other Specifications: 10 Mb/s connection, calendar IC

Sound

• Sound CPU : Motorola 68000 (16/32-bit) @ 12 MHz (2.1 MIPS)
• Sound Chip: 2× Yamaha SCSP/YMF292-F
  • DSP: 2× "LAKE" FH1 128-step DSP
  • PCM audio: 64 voices/channels, 16-bit depth, 44.1 kHz sampling rate (CD quality)
  • Other features: MIDI interface, 32 MIDI channels, 32 FM synthesis channels, 32 LFO channels, 4-channel surround sound, 16.5 MB audio ROM
• Optional sound board: MPEG Sound Board
  • Sound CPU: Motorola 68000 or Zilog Z80
  • Sound chip: NEC uD65654GF102
  • Features: MPEG audio compression, stereo output, steam individual mono channels to left and right speakers

Graphics

• GPU: 2× Lockheed Martin Real3D/Pro‑1000
  • ALU core: 4× Mitsubishi 3D‑RAM @ 100 MHz (2× 3D‑RAM per Pro‑1000)
    • Framebuffer resolution: 1280×1024
    • Capabilities: Blending, depth check, stencil & raster operations, pixel buffer, tiled rendering, Z-compare, Z-buffering, alpha blending, OpenGL support
    • Render output units: 4 ROP units
    • Geometrizer performance: 400 million operations/sec, 3.5-7.5 million vectors/sec, 2-4 million triangle polygons/sec
    • Fillrate: 1.6 billion pixels/sec erase, 400 million pixels/sec write/render, 200 million pixels/sec read
    • Bandwidth: 1.6 GB/sec internal bus, 400 MB/s (sustained) to 14.6 GB/s (peak) external bus
  • Texture mapping: Full color texture mapping, mipmapping, perspective correction, texture filtering
  • Anti-aliasing: Texture anti-aliasing, multi-layered anti-aliasing (multi-sample anti-aliasing), texture & edge multi-layered anti-aliasing
  • Shading: Flat shading, Gouraud shading, high-specular Gouraud shading, micro texture shading, fix shading
  • Lighting effects: Parallel light, pin-point light, 4 light spots, 4 spot lights, pin spot light
  • Texture fillrate: 16 million coloured textures/sec, 2 million triangle polygons/sec or 1 million quad polygons/sec with all effects (including texture filtering, shading, translucency, anti-aliasing and fog)
  • Other special effects: Zoning fog, 32 levels of translucency, clipping, model & texture LOD, fade in/out, 4095 moving models, motion blur
  • Other capabilities: T&L (transform, clipping, and lighting), alpha blending, trilinear filtering, trilinear interpolation, specular reflection, specular highlight, Z-buffering, culling, reflection/environment mapping
• Display Resolution: 496×384 to 640x480, progressive scan (non-interlaced), 24 kHz horizontal sync, one or two planes
  • Refresh rate: 60 Hz, 60 frames per second
• Color Depth: ARGB, 24-bit RGB true color (16,777,216 colors) and alpha opacity
• Scroll Window: Two planes (24 kHz, two plane mode), 16 colors/32,768 1024 palette x 2 bank, 256/32,768 64 palette x 2 bank
• Video board:
  • Step 1.0: Sega 837-11859 MODEL3
  • Step 1.5: Sega 837-12875 MODEL3 STEP 1.5
  • Step 2.0: Sega 837-12716 MODEL3 STEP2
  • Step 2.1: Sega 837-13368 MODEL3 STEP2.1

Memory

• Memory: Up to 285.16504 MB (128 MB main, 123.15723 MB video, 33.69533 MB audio, 320 KB other)
  • RAM: 32.54004 MB (33,321 KB)
    • Main RAM: 8 MB (8192 KB) @ 66 MHz
    • VRAM: 23,713 KB (8 MB texture memory, 1 MB display list, 4 MB culling, 4 MB polygons, 5 MB framebuffer 3D-RAM, 1152 KB tilemap generator VRAM, 33 KB SRAM cache)
      • 4× Mitsubishi 3D-RAM: 5 MB (4× 1.25 MB) fast framebuffer SD VRAM, 1 KB (4× 256 bytes) pixel buffer SRAM cache
      • 8× Hitachi HM5241605 SDRAM: 4 MB (8× 512 KB)
      • 16× Mitsubishi M5M4V4169 cache: 8 MB (16× 512 KB) SDRAM, 32 KB (16× 2 KB) SRAM
    • Audio RAM: 1096 KB (64 KB main, 1032 KB SCSP; 512 KB per SCSP chip)
    • Other RAM: 320 KB (192 KB security, 128 KB backup static NVRAM)
  • ROM: Up to 252.625 MB (120 MB main, 100 MB video/texture/graphics Mask ROM, 32.625 MB audio ROM)
    • ROM access time: 100 nanoseconds
    • High-speed access allows ROM to effectively be used as RAM, and textures streamed directly from ROM.

Hardware Images

• 

  Main Board

• 

  Main Board 2

• 

  Sound board

• 

  Complete Board

List of Games

Step 1.0

• Boat Race GP (1996)
• Virtua Fighter 3 (1996)
• Virtua Fighter 3tb (1997)
• Sega Bass Fishing/Get Bass (1998)

Step 1.5

• Scud Race / Super GT (1996)
• Le Mans 24 (1997)
• Scud Race Plus (1997)
• The Lost World: Jurassic Park (1997)
• The Lost World: Jurassic Park Special (1997)
• Virtua Striker 2 (1997)
• Virtua Striker 2 Version '98 (1998)

Step 2.0

• Harley Davidson & L.A. Riders (1997)
• Fighting Vipers 2 (1998)
• Sega Rally 2 (1998)
• Ski Champ (1998)
• Virtua Striker 2 (1997)
• Virtua Striker 2 Version '98 (1998)
• Virtua Striker 2 Version '99 (1999)
• Virtua Striker 2 Version '99.1 (1999)
• Virtual-On Oratorio Tangram (1998)

Step 2.1

• Daytona USA 2 (1998)
• Daytona USA 2: Power Edition (1998)
• Dirt Devils (1998)
• L.A. Machineguns (1998)
• Spike Out (1998)
• Star Wars Trilogy Arcade (1998)
• The Ocean Hunter (1998)
• Emergency Call Ambulance (1999)
• Magical Truck Adventure (1999)
• Spikeout: Final Edition (1999)
• Virtua Striker 2 '99 (1999)

Sega arcade boards
Originating in arcades
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 VIC Dual G80 Zaxxon VCO Object System 1 LaserDisc Appoooh Hang-On System 2 System 16 OutRun Gigas X Board Y Board System 24 System 18 System 32 Model 1 Model 2 H1 Board Model 3
Console-based hardware
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 SG-1000 System E System C Mega-Tech System Mega Play Sega Titan Video NAOMI Hikaru NAOMI 2 Atomiswave System SP Chihiro Triforce
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