Plural source arbitration system

Claim 1

A communications system including arbitration means for regulating communications between a keyboard and a remote control unit and a computer via a keyboard input to the computer and wherein each of said computer, said keyboard and said remote control unit include individual clock lines and individual data lines and each of said computer, keyboard and remote control unit includes clock signal generating means for placing a pulsed clock signal on its associated clock line when supplying a pulsed data signal on its associated data line, comprising: an arbitration logic network interconnected with said clock lines and said data lines; a plurality of flip flop latches in said logic network coupled to respective ones of said clock lines; logic means for developing a clock active signal in response to the presence of one or more clock signals on said clock lines; and retriggerable timer means responsive to said clock active signal for coupling a disable signal to said flip flop latches for latching the status of said clock lines; said timer means being retriggered by successive pulses of said clock active signal and maintaining said disable signal for a predetermined timeout period after said termination of clock active signal.