A method 6 or 7 wherein said {HEAD ~ data acquisition routine} is called at intervals by a hardware generated {TAIL ~ clock} interrupt 
A method 6 or 7 wherein said { HEAD ~ data acquisition routine } is called at intervals by a hardware generated { TAIL ~ clock } interrupt
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH