Two metal blocks are welded to respective metal sheets to form sealed assemblies. A piston is mounted for reciprocation within the cylinder and the cylinder is provided with an air inlet valve, and exhaust valve and an intake valve. The added mechanisms collectively achieve the objective of supporting connection of multiple slave devices to a common controller interface, and at the same time allowing pipelined operation of the slave devices. \u201d To calculate the quantity percentile, the seller determines the difference in quantities between the start price break and the end price break for the specific adjustment curve that is being plotted. The software processes the plurality of events in the batch file against game logic to update one or more of the game state parameters in the game state data object.