In an offset control circuit, a voltagecurrent converting portion generates differential current that are proportional to a potential difference between differential input voltage signals, and an offset adjusting current-generating portion generates offset adjusting currents. The latching mechanism includes two release members protruding forwardly from the support member, wherein an upper one of the release members is positioned above a lower one of the release members. The indirect injector is in fluid communication with the crank case. The apparatus operates based on the operational condition defined by the parameter value, to make a diagnosis. According to yet another embodiment of the present invention, one or more indicia for a particular pay line are received for display thereon from at least one other gaming device. This provides a fast and reliable way of collecting data of products in the inventory systems and also a fast and reliable way of updating information of inventory files in the inventory systems.