An invert mechanism for moving parisons between a pre-forming station and a finishing forming station of a glass forming machine is disclosed. The purpose of retarding timing of the intake valves is to retard valve closing sufficiently to shorten the effective compression strokes of the pistons and thus reduce the effective compression ratio. The data signals are multiplexed to control access to the shared IO pins. A ring topology request or a response to the ring topology request is received from at least one node on the ring. Thus, when a data transfer request from the IO device 138 to the main memory 135 is generated, no bus cycle is generated on the system bus 132 as long as this data are retained in the associative memory 106.