A color compensation method for a display device. The method uses a coset operating mode and nonzero-syndrome-based decoding to accelerate the simulation of the read-channel’s error-rate characteristics corresponding to different parity-check matrices employed in the read-channel’s turbo-decoder, such as a low-density parity-check decoder. An asynchronous transaction ready to be serviced at the first or second device, such as an asynchronous memory read or write, is scheduled if no isochronous transaction is ready to be serviced. In the method, an application process user interface event is processed using an operating system process. Proper nozzle flow can be determined by monitoring the torque of the stepper motor. The apparatus can be a mobile phone 10 or a visual display unit.