| 摘要 |
PURPOSE:To accomplish setting of a data buffer in the software area by separating I/O instruction from a read-instruction, and by controlling the state of vacancy of a data buffer whose output control device is set in the main storage. CONSTITUTION:Every time a new data is inputted from a peripheral equipment DEV4-1, an entry in free state is found, and its buffer address pointer is transferred to a buffer 30 of an MMU 3 and stored there. The link pointer of the entry which is pointed out until now by the first tail entry pointer, points the newly found entry, furthermore, the first fail entry pointer itself is renewed so as to point this newly found entry.
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