Secondary storage facility with means for monitoring error condi

Details Secondary storage facility with means for monitoring error condi Secondary storage facility with means for monitoring error condi

1977-06-06

1979-03-13

Thomas, James D.

Boots, shoes, and leggings

G06F 304, G06F 1304, G06F 1106

Patent

active

041445830

ABSTRACT:
A drive for use in a secondary storage facility that includes a controller and a drive bus that interconnects the controller and one or more drives. Each drive includes various circuits for monitoring predetermined conditions within the drive and for generating a status signal whenever one of these conditions changes from a normal state. The controller contains circuitry for generating, in a recurring sequence, an address that identifies each drive connected to it. Polling lines of the drive bus convey these addresses to all the drives in parallel. Each drive monitors these polling lines concurrently with other operations it may be performing. When the polling lines identify the drive, the drive examines the status signal and generates an attention signal onto a common attention line that is conveyed back to the controller where it is stored in such a fashion that there is no ambiguity as to the source of the attention signal.

REFERENCES:
patent: 2921293 (1960-01-01), Bartelt
patent: 3568160 (1971-03-01), Talarczyk
patent: 3911400 (1975-10-01), Levy
patent: 3990055 (1976-11-01), Henderson

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