Abstract: This paper discusses the structure of BIOS programs. The programming and operation with BIOS are also introduced, It is proved that SEA M as reliable as DRAM in the industrial controller. It is good for anti-industrial interference with good quality of the electric power and the suitable mainboard with its special BIOS. It is easy to change tile program and control parameters through disk with monitor. So, special industrial computers can be made up of common personal computers' mother boards.