Unlike the Neo Geo or CPS-2, the Model 1 did not use standard Z80 sound chips. It used a custom 16-bit PCM and DSP system.
The launch title for the Model 1. Virtua Racing was the first arcade game to use 3D polygons for a racing sim. Unlike the flat Hard Drivin' (1989), Virtua Racing ran at a silky 30 frames per second with a camera that followed the car. The ROM pack usually includes the 8-player "twin cab" version. Sega Model 1 Roms Pack