A method for processing business transaction orders received asynchronously. In a printing apparatus employing the printing control method, a carriage to which a printhead having a plurality of printing elements is mounted is reciprocally scanned, and printing is performed on a printing medium during acceleration, deceleration, and constant-speed movement of the carriage. The influence of pinned magnetic layers on free magnetic layer magnetization orientations is substantially eliminated, allowing for increased predictability in switching behavior and increased write selectivity of memory cells. The resulting calibration data is then used to generate a correction map which is stored in the X-Y digitiser. This optimizes use of the resources of the private network. An input portion of the output rod is connected to the rotating member so as to transmit rotation.