A peripheral device, connected to a computer, has either a first or second interface. The first interface communicates over a differential data connection and the second interface communicates over a clock conductor and a single ended data connection. The peripheral device has first and second communication conductors that are either connected to the differential data connection when the computer includes the first interface or to the single ended data connection and the clock conductor when the computer includes the second interface. The peripheral device has an interface detection component that detects which of the first and second interfaces the peripheral device is connected to. The peripheral device also has a controller that communicates according to a protocol corresponding to the detected interface.