Sega Model 1
From Sega Retro
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. During development, Sega went to General Electric Aerospace (now Lockheed Martin) for assistance with creating 3D hardware, however as the end result was so expensive, only a few games were developed for the platform.
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.
List of Sega Model 1 Games