What control the top speed on a 1994 Oldsmobile lss is it governor or computer?

The top speed on a 1994 Oldsmobile Cutlass Supreme (assuming you mean an LSS) is controlled by a combination of factors, primarily the computer (PCM - Powertrain Control Module), but indirectly influenced by the engine's capabilities and the transmission. There isn't a separate, standalone governor in the traditional sense like some older cars had.

The PCM uses various inputs (speed sensor, throttle position sensor, engine RPM, etc.) to limit the vehicle's speed. It achieves this by refusing to allow the engine to produce more power beyond a certain point. This is often referred to as a "speed limiter" programmed into the computer's software.

While there might be some mechanical limitations (like the engine's redline or transmission gearing), the PCM actively manages and enforces the top speed limit.