Daytona USA used the Sega Model 2 arcade hardware while Daytona 2 used the Model 3. None used the Naomi(a beefed up Dreamcast of sorts modified for arcade use).

Daytona USA used the Sega Model 2 arcade hardware while Daytona 2 used the Model 3. None used the Naomi(a beefed up Dreamcast of sorts modified for arcade use). Multiple machines could have been networked together I dont know how the older model boards did it but the Naomi used standard R45 network port(at least for Netboot) and it was standard TCP IP stuff.