Abstract: A flight simulator includes a host computer 10 coupled to serial buses 13 by master-interface circuits 12, each of which is a serial bus master controller. Each bus 13 is coupled to a number of slave circuits 14, and each slave circuit 14 drives several instrument display devices 15. The slave circuits 14 contain slave bus controllers and digital to analog conversion circuits for developing the drive signals for the display devices 15. Each slave bus controller is provided with one or more programs for processing received serial data in accordance with the electro-mechanical characteristics of the driven display device 15. Analog feedback signals may be provided by the devices 15 and A-D converted in the respective slave circuits 14 before transmission as serial data to the host computer 10 via the buses 13 and master-interfaces 12.