An apparatus for reproducing data includes a branch metric computation unit and a plurality of parallel computation units. The hardware logic receives a transaction from a virtual central processing unit directed at a bus slave, the transaction being associated with a virtual CPU identification, wherein the virtual CPU is implemented on a physical CPU. The present invention can facilitate centralized control of the firewall and the IDS and can increase the speed at which packets are passed between a secured computer network and an external network. The inkjet head also includes a filter that covers the plurality of ink supply openings. The advancement and retraction of the first and second bits can be controlled by a control unit that uses sensor signals, timers, preprogrammed instruction and any other suitable arrangement.