Methods of producing low resistivity tungsten bulk layers having low roughness and associated apparatus are provided. The application devices can be a Web tablet, a set-top box, a VCR, a TV, and PDA, a lamp, a coffee machine, a radio, a telephone, a background wall, a DVD player or an electronic information panel. The ideal signal generator generates a target waveform serving as an equalization target. The skirt is detachably attached to one side of the frame assembly and extends outward from the side of the frame assembly. When it is determined that the PDL command that has been executed is a re-execution unnecessary command, the PDL interpretationexecution unit overwrites the PDL command stored on the hard disk with a NOP command.