interface means, connected to said cache means, for enabling said {HEAD ~ cache} means to transmit or receive {TAIL ~ data} to/from said system bus and including a second directory means reflective of the most current validity status of any data moved on said system bus, said interface means further including: 
to receive
interface means , connected to said cache means , for enabling said { HEAD ~ cache } means to transmit or receive { TAIL ~ data } to / from said system bus and including a second directory means reflective of the most current validity status of any data moved on said system bus , said interface means further including :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH