Method and apparatus for weighting the priority of access to var

Details Method and apparatus for weighting the priority of access to var Method and apparatus for weighting the priority of access to var

1978-01-23

1980-04-29

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 1304

Patent

active

042009286

ABSTRACT:
A method and apparatus for accessing data blocks in a computer system having multiple-disk drive rotational position sensing which is not centrally synchronized and where data read and write requests are normally weighted by the order of availability of requested data blocks. The weighting of the priority, or queue position, of selected data blocks is modified by advancing the apparent initial location of data blocks designated for preferental access and maintaining an availability signal, or peripheral interrupt, for an extended period. A special pre-data-transfer instruction indicates the duration of the peripheral interrupt. A circuit for implementing the invention has a storage register for receiving the special instruction, a down counter for decrementing for the duration of the designated pre-data-interrupt and an interrupt duration control latch for issuing and extinguishing the interrupt. The invention permits preferential processing of demand type high priority data where there is no central clock synchronization among peripheral storage devices.

REFERENCES:
patent: 3544966 (1970-12-01), Harmon
patent: 3629860 (1971-12-01), Capozzi
patent: 3678464 (1972-07-01), Peters
patent: 3809884 (1974-05-01), Nibby et al.
patent: 3919695 (1975-11-01), Gooding
patent: 4050096 (1977-09-01), Bennett et al.
patent: 4050097 (1977-09-01), Miu et al.
patent: 4060794 (1977-11-01), Feldman et al.
patent: 4096569 (1978-06-01), Barlow

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