| 摘要 |
PURPOSE:To efficiently use a buffer memory by dividing a buffer into plural memory blocks and using memory blocks in series or in parallel in accordance with the data volume. CONSTITUTION:A buffer memory 3 in which data of an input/output device is temporarily stored is divided into plural blocks #1-#n, and an address management control means 1 which designates the upper address of the divided buffer and an address counter 2 which designates the lower address are provided. Since divided blocks of the buffer are used in series or in parallel in accordance with the data volume, the buffer is efficiently used.
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