A housing for a device operated under at least one of a vacuum and a protective gas includes at least one housing interior space, at least one receiving region configured to receive at least one getter material, and a connection between the at least one housing interior space and the at least one receiving region. The algorithm is non-blocking and may be performed in a parallel, multi-processor environment. The sheet conveyance apparatus moves the shift unit in the widthwise direction when it is determined that the overlapping portion of the sheets has reached the conveyance roller pair. This configuration can increase the mechanical strength of the shadow mask. The masking of the parallel storage device interface interrupt if no storage device is coupled to the parallel storage device interface allows the controller for the serial storage device interface to share the interrupt traditionally assigned to the parallel storage device interface.