| 摘要 |
PURPOSE:To easily perform the maintenance of registered data, etc., by separating an integrated unit of RAMs and a backup system from a main body system and connecting it to another maintenance system. CONSTITUTION:A CPU(central processing unit part) including a microcomputer is provided with the memory unit 3 which can be separated from a system bus and the memory unit 3 is equipped with a connector CN1 for connection with the system bus, a circuit 11 which switches the electric power from the system and the electric power supplied from a backup power source BAT1 through a diode D1, and memory RAMs 1 and 2 which can be backed up. Then the unit constituted by integrating the RAMs 1 and 2 and backup means is separated from the main body system and connected to the other maintenance system. Consequently, the registered data is easily copied and the reliability is improved. |
