A semiconductor readout circuit reads out a potential of each of plural data lines by comparing the potential with a potential of a common reference data line, using a sense amplifier provided for each of the data lines. Moreover, the data control circuit has a data saving control function whereby it, via a debugging port of a volatile memory storing data to be processed by the electronic circuit, saves that data. The data recording device includes a location detection device, and a unique equipment identifier is associated with each remote equipment location, so that travel instructions may be displayed for directing the inspector to the location of selected equipment. The at least one criteria indicates whether a portion of the plurality of startup applications is extraneous at startup.