Central processor for a telephone exchange

Abstract From the Canadian patent

A central processor for controlling the operation of the subsystems of a telephone exchange switching system which are interconnected on a common data bus to establish requester service between telephone subscribers wherein the, exchange system includes a program memory also connected to the common data bus for storing a plurality of selectable multiple bit operational codes to be utilized by the central processor in response to a particular service being requested a program address register for selecting a desired operational code from the program memory, an instruction register for storing the selected operational codes and a control word generator which provides function control signals …