The Adder CCSUN interface cables deliver high functionality multi platform KVM connectivity at low cost, and may be used with any PS/2 style KVM switch. Miniature 'keep alive' circuitry is moulded into the cables to ensure problem free computer operation even if the KVM switch is powered off. An intelligent communications system enables the active circuitry within the cables to work in close partnership with ADDER MP Matrix and 108 MP switches to provide enhanced functionality.