Abstract: A combustion control system applicable universally to various types of combustion apparatus operating with different control timing and different fuel is disclosed. The combustion control system includes a data selector circuit, a control circuit, and a control timer circuit using a counter as timing means. The data selector circuit includes a circuit section for providing pre-purge timing and another circuit section for providing ignition timing as required. The control circuit includes an R-S flip-flop controlled by the pre-purge timing produced by the data selector circuit section.

Abstract: A bipolar read-only memory comprising a matrix circuit having selection input lines, digit output lines and Schottky barrier diodes connected between the selection input lines and the digit input lines according to information contained in the memory, a selection input circuit of an I.sup.2 L construction electrically associated with the selection input lines and a digit output circuit of an I.sup.2 L construction electrically associated with the digit output lines.