1. A flight control system, comprising: an output device; a first processor; a second processor, the second processor being dissimilar to the first processor; a first arbitration device coupled to the first processor; a second arbitration device coupled to the second processor, the second arbitration device configured to coordinate transaction synchronization with the first arbitration device and the first arbitration device configured to coordinate transaction synchronization with the second arbitration device; and a comparator processor coupled to the first arbitration device and the second arbitration device, the comparator processor being configured to: compare transaction synchronized outputs of the first and second processors; and transmit a command to the output device according to the comparison.