Simplex 4100-1210 Analog Controller BoardThe 4100 1210 Analog Audio Controller, 4100 1211 Digital Audio Controller, 4100 1311 Digital Audio Controller, and their respective option cards make up the audio controller subsystem of the Fire Alarm System. The controller is the head end of the audio system, and is seen by the system CPU as a single slave: only the audio card is visible, while any option cards appear logically as memory mapped locations on the audio controller. The main function of