A multiple interface input/output port (11) allows communications between an interface bus (14) of a peripheral device (10) and any one of a plurality of different types of interface buses (18) that may be provided in a host computer (16). An interface bus detection circuit (22) detects which type of interface bus (18) the peripheral device (10) is connected to on the host computer (16), and communications are then routed through an appropriate interface adapter (26) that enables communication between the interface buses (18) of the peripheral device (10) and host computer (16). The interface bus detection circuit (22) compares signal levels on selected ones of the lines (45) of the interface bus (14) of the host computer (16) to a reference potential to determine which of the selected lines (45) are grounded. The circuit then identifies the type of the interface bus (18, 14) to which it is connected based on the determination of which of the selected lines (45) of the interface bus (14) are grounded.