1. A digital signal processing system for interfacing with a central control having at least one port, comprising: means for processing having an interface port connected to the port of the central control and at least first, second and third ports; a serial multiplex communication bus for carrying at least n.times.6, where n is a whole number, channels on a synchronous time division basis; at least first, second and third kernels for running software application tasks having at least first, second and third ports, respectively, connected to said at least first second and third ports of said processing means, respectively, each of said kernels having a channel port connected to the serial multiplex communication bus; means for selecting, in sequence, each of said kernels for intermittent communication with said serial multiplex communication bus to cause each of said kernels to continuously communicate with two successive channels for every six channels occurring on said serial multiplex communication bus; and said processing means receives data from the central control and in response to the data selectively (a) transfers the data to the kernels and (b) processes the data without transferring the data to the kernels.