| 摘要 |
PROBLEM TO BE SOLVED: To use the entire area widely and equally even when the capacity of a main storage increases and to suppress the capacity of a table regarding main storage management. SOLUTION: The management table is provided which shows the use states of blocks of large capacity while the main storage is divided into the blocks and each management block is provided with bits as many as all pages to which one bit each showing the use state of the corresponding page is assigned while the corresponding block is divided into the pages of small capacity. A main storage management part which specifies and allocates different blocks in order at requests for the allocation of the mains storage area retrieves a management table corresponding to a specified block at a request to obtain a usable page position and areas for a necessary number of pages, and updates the states of each bit of the pages in the corresponding management table.
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