Multiple channels are accommodated via a channel interface, also controlled by {HEAD ~ the microprocessor}, between external video devices and {TAIL ~ the random access memory} 
Multiple channels are accommodated via a channel interface , also controlled by { HEAD ~ the microprocessor } , between external video devices and { TAIL ~ the random access memory }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL