A positioning device includes a computer including a stored design file, such as a CAD file, for positioning a selected portion of the design on a workpiece. The patterns include a circuit mask pattern, and first and second mark mask patterns having dimensions which change in accordance with exposure of the resist film. The oldest data element in each of the least one data store is determined and it is then determined for each of the at least one data store whether a logged representation of the data store’s oldest data element is more recent than the point recorded. The MCU and the display driver are interconnected by a mode selection line, a reference clock line, and a data transmission line set.