A peripheral interface unit 18 is coupled to system bus 12 for interfacing {TAIL ~ system bus} 12 to each of a plurality of peripherals such as peripheral 34, peripheral 36 and {HEAD ~ peripheral} 38 via a peripheral bus 32 
A peripheral interface unit 18 is coupled to system bus 12 for interfacing { TAIL ~ system bus } 12 to each of a plurality of peripherals such as peripheral 34 , peripheral 36 and { HEAD ~ peripheral } 38 via a peripheral bus 32
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH