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Semiconductor History | Fujitsu Kawasaki — MB86233 Gives Model 1 Its Geometry Engine
· 1992-8
Personal memoryBy kevin · · updated · Report an issue
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Semiconductor History | Fujitsu Kawasaki — MB86233 Gives Model 1 Its Geometry Engine
kevin
Aug, 1992
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In August 1992, Sega put Virtua Racing into Japanese arcades on Model 1, its first board built around real-time three-dimensional polygons. Behind the moving cars and changing camera views was a less visible problem: transforming coordinates, rotating objects, and calculating geometry quickly enough to redraw the scene many times each second.
Model 1 assigned that work to Fujitsu's MB86233, a 32-bit digital signal processor that Sega called a TGP. Boards used several devices in geometry and coprocessor roles, with Sega-specific programs turning a general numerical engine into part of an arcade graphics pipeline.
The good was division of labor. Fujitsu's processors handled transformation and lighting calculations while the NEC V60 main processor managed the game, allowing steering, rivals, pit crews, and multiple viewpoints to exist inside one continuously calculated polygonal world.
That made the chip more than a fast calculator. Dedicated geometry processing changed design: a camera could move from the driver's seat to an overhead view during play, and the same three-dimensional course could be observed from positions that would have required separate artwork in a sprite system.
The bad was board complexity. Model 1 distributed graphics work across multiple DSP packages, custom programs, memory, and separate rendering logic, creating an expensive specialized machine whose behavior was difficult to reproduce once its original documentation and hardware became scarce.
Its visual vocabulary was also narrow. Model 1 drew flat-shaded polygons without the texture mapping that Sega highlighted when Model 2 and Daytona USA arrived in 1994, so shape, color, lighting, and motion had to carry details that later boards could paint onto surfaces.
For Fujitsu, the design win showed how a Japanese computer and semiconductor company could sell numerical processing into an unfamiliar market. Sega did not need to build every arithmetic engine from scratch, while Fujitsu's merchant DSP became several custom-numbered parts inside a platform that helped establish Sega's 3D arcade line.
The pin marks Fujitsu's verified Kawasaki research and manufacturing anchor, now Fujitsu Technology Park; it does not identify the MB86233's exact design room or fabrication line. The cover is a modern photograph of a decapped 315-5571 die, where “MB86233” and “© FUJITSU 1991” remain visible in silicon.
Sources: Sega, Virtua Racing product archive, corporate timeline, and Model 1 history; MAME, TGP documentation and Model 1 implementation; Guru's Model 1/2 hardware research; VGMdb, Virtua Racing arcade release record; Fujitsu, Kawasaki Technology Park location records.
Photo: “Sega 315-5571 mz mit20x-10k,” capsOff / Siliconpr0n, CC BY 3.0, via Wikimedia Commons. https://commons.wikimedia.org/wiki/File:Sega_315-5571_mz_mit20x-10k.jpg
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