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