Where is the computer in a 95 Buick roadmaster?

A 1995 Buick Roadmaster doesn't have a single, centralized "computer" like a desktop PC. Instead, it uses several Electronic Control Modules (ECMs), also known as control units or modules. These are distributed throughout the vehicle. The main ones controlling engine functions and other major systems are usually located under the hood, possibly near the firewall, and sometimes under the dash. Their exact locations can vary slightly. You'll find them in various boxes or housings. A repair manual for your specific year and model Roadmaster would show the precise locations.