The Eunos Roadster Driving Simulator is a venture between Namco, the Mazda Motor Corporation and Mitsubishi Precision, released in 1989, and running on Namco's System 21 hardware; it is a first-person racing game that was later developed into an unreleased S22 prototype named "SimDrive", in 1992, but eventually became the basis for the "full scale" version of Ridge Racer, at the start of 1994.