A computer system comprising a first expansion bus which operates according to a first transfer protocol and is adapted to couple to one or more peripheral devices. A central processing unit and a bus bridge are operatively coupled to the first expansion bus. A second bus including a ...http://www.google.de/patents/US5771360?utm_source=gb-gplus-sharePatent US5771360 - PCI bus to target integrated circuit interconnect mechanism allowing multiple bus masters and two different protocols on the same bus 
