Efficient techniques for controlling synchronization of bus transactions to improve performance and reduce power requirements in a shared memory system are described. This holding is provided by a cradle formed in a cable support connected to the pivot pin, and by a collar articulated to one edge of the cradle and which can be folded down into the closed position onto the opposite edge of the cradle, to which this collar can be connected detachably by at least one detachable retaining element. Based on the measured values, calculation is performed to obtain calculated light intensity distributions of reflected light reflected from a plurality of virtual patterns. A local column address stored in the local column address register is applied to an AND gate, which selects either the local column address or a column address applied to the AND gate by the central control unit. If the software to be updated is determined to be software related to the GUI display function, the printing apparatus performs control to display information about a status of the own apparatus during execution of the update by using a CUI display function. A biaxial rotation unit is placed on a table of the wire electric discharge machine.