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Controlling system of subchannel

阅读:103发布:2021-06-13

专利汇可以提供Controlling system of subchannel专利检索,专利查询,专利分析的服务。并且PURPOSE:To control numerous I/O devices with a small-capacity subchannel memory, by storing subchannel information in a vacant area of a main memory and fetching the information in the memory of channel at any time to use the information. CONSTITUTION:A table list TL is accessed with subchannel numbers 0-m and, when a subchannel buffer valid bit SB Valid is ''1'', the said subchannel exists in a buffer SB. If the valid bit SB Valid is ''0'', the subchannel exists in a memory SM. The subchannel held by the subchannel buffer SB is recently used ones or frequently used ones and the maximum number of the held subchannels is (n) pieces. When a subchannel which does not exist in the buffer SB is used, the subchannel is called out from the subchannel memory SM. If no vacant area exists in the buffer SB when the subchannel is called out from the memory SM, the oldest subchannel in the buffer SB is expelled from the buffer SB and returned to the memory SM, and then, the above-mentioned subchannel information is fetched in the emptied area of the buffer SB.,下面是Controlling system of subchannel专利的具体信息内容。

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