Control system for updating a change bit

Details Control system for updating a change bit Control system for updating a change bit

1983-11-18

1987-04-14

Eng, David Y.

Boots, shoes, and leggings

G06F 1314

Patent

active

046583564

ABSTRACT:
Change bits are provided in correspondence with storage information units (blocks or pages) of a storage, and indicate whether or not a "store" operation has been performed into the corresponding storage information units. The change bits are retained in a first retention device in correspondence with the storage information units, and a copy of the change bits in the first retention device is retained in a second retention device. When the store operation is performed to effect a storing of data into the storage, a control device refers to the change bit retained by the second retention device and controls updating of the change bit of the first retention device in accordance with the indication of the change bit referred to.

REFERENCES:
patent: 4084231 (1978-04-01), Capozzi
patent: 4149245 (1979-04-01), Gannon
patent: 4277826 (1981-07-01), Collins et al.
patent: 4322815 (1982-03-01), Broughton
patent: 4323968 (1982-04-01), Capozzi
patent: 4394731 (1983-07-01), Flusche
patent: 4464712 (1984-08-01), Fletcher
patent: 4491911 (1985-01-01), Sato

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