Abstract: An apparatus for automatic configuration of multiple peripheral interface subsystems in a computer system, the computer system including a system expansion bus for adopting a plurality of functional peripheral interface subsystems, the apparatus comprises a software identification code buffer for buffering a software-generated identification code sent via the system expansion bus; a hardware identification code memory for storing a unique hardware identification code; a software identification code register for transmitting the software identification code via the system expansion bus for the access of the computer system; an instruction register for receiving instructions transmitted by the computer system; a hardware identification code detector for receiving the instruction transmitted by the computer system and stored in the instruction register to control the hardware identification code detector; and an automatic jump state circuit for receiving the instruction transmitted by the computer system and reg