A system for storing data in read-only memory is disclosed that comprises bit level conductors, transistors, and sets of reference level conductors. Each reference level conductor has a reference value. A selected reference level conductor transmits a selected reference value to one of the transistors. The transistor transmits the selected reference value to a selected bit level conductor having a selected bit value. The bit level conductors, the transistors and the reference level conductors store data by encoding data as a combination comprising the selected bit value and the selected reference value. A method for storing data in read-only memory is disclosed. Bit level conductors having bit values, transistors, and sets of reference level conductors having reference values are provided. A selected bit value of a selected bit level conductor and a selected reference value of a selected reference level conductor are selected. Data is encoded by translating the data from a digital form to a combination comprising the selected bit value and the selected reference value. The data is stored by coupling the selected bit level conductor to the selected reference level conductor such that the selected reference level conductor can transmit the selected reference value to the selected bit level conductor.