Namco System 22

The Namco System 22 is the successor to the Namco System 21 arcade system board. It debuted in 1992 with Sim Drive in Japan, followed by a worldwide debut in 1993 with Ridge Racer.

The System 22 was designed by Namco with assistance from graphics & simulation company Evans & Sutherland. Graphical features include texture mapping, Gouraud shading, transparency effects, and depth cueing, thanks to the Evans & Sutherland 'TR3' chip/chipset, which stands for: Texture Mapping, Real-Time, Real-Visual, Rendering System. The main CPU provides a scene description to the TR3 graphics processing unit and a bank of DSP chips which perform 3D calculations.

A variant of the system, called the Super System 22, was released in 1995. The hardware was largely similar to the System 22, but with a slightly higher polygon rate and more special effects possible.

System 22 Specifications

 * Main CPU: Motorola 68020 32-bit @ 24.576 MHz
 * DSP: 2x Texas Instruments TMS32025 @ 49.152 MHz (exact number of DSPs may vary)
 * GPU: Evans & Sutherland TR3 (Texture Mapping, Real-Time, Real-Visual, Rendering System)
 * Features: Texture mapping, Gouraud shading, transparency effects, depth cueing, 16.7 million colors, 240,000 polygons/second
 * Sound CPU: Mitsubishi M37702 (System 22 Games) or M37710 (Super System 22 Games) @ 16.384 MHz
 * Sound Chip: Namco C352 (32 voices, 4 channels @ 16-bit, support for 8-bit linear or μ-law PCM samples)
 * + Namco Custom Chips