Systems and methods for regulating communications in computing systems are provided. For instance, a computing system can include a first processing board including a first processing device and a first control device. The system can further include a second processing board including a second processing device and a second control device. The system can further include a communications interface communicatively coupled to the first processing board. The communications interface includes one or more input/output ports configured to facilitate communication between the avionics system and one or more external devices. The first control device of the first processing board is communicatively coupled to the second control device of the second processing board via a shared bus. The first control device is configured to regulate communications associated with the communications interface.