protected int getAnalogRedstoneInput(int r) {
        return (getRedstoneInput(r) + 16) / 17;
    }
Mapped inputs and outputs of the gate.
OOOO IIII
High nybble is output.
Low nybble is input
integration/src/main/java/mrtjp/projectred/integration/part/RedstoneGatePart.java