(3) Configuring the main memory unit Main memory unit for the configuration of the main memory unit is a single-user system composed of two parts. In other words, the operating system is divided into zones that the user program is loaded with the current area to perform reside. Multiprogramming system, several processes are to be processed and a state that it is because a plurality of user area for the process to a portion other than the region where the operating system resides divided programming load. Therefore, if a plurality of programs that are loaded in the Main memory unit has a number of techniques of the operating system are needed for managing Main memory unit in order to maximize the performance of Main memory unit. In addition, the fundamental reason that requires the operating system to the main memory management can be divided into two cases. First, if the main storage size that exceeds the addressable range of the CPU, second, when the size of the main memory run out for storing all programs and data. These two cases it is impossible to directly address for CPU without operating system's aid which all the programs and data stored in the main memory.
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