Connection apparatus which facilitates conflict-free interfacing

Details Connection apparatus which facilitates conflict-free interfacing Connection apparatus which facilitates conflict-free interfacing

1996-03-28

1999-10-05

Auve, Glenn A.

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

395500, G06F 1314

Patent

active

059616245

ABSTRACT:
In the case where one peripheral apparatus is shared by a plurality of host computers via an SCSI interface, an interface apparatus is provided between the plurality of host computers and the peripheral apparatus. When the first host computer and the peripheral apparatus are connected, the interface apparatus monitors whether a selection to the peripheral apparatus has been issued from the second host computer or not. When the selection is issued, a status of "Busy" is returned as a response to the second host computer. The interface apparatus simultaneously monitors whether the first host computer has released a use right of the peripheral apparatus or not. Even if the first host computer doesn't release the use right of the peripheral apparatus, so long as there is no access for the predetermined time, the second host computer and the peripheral apparatus are connected in response to the selection or the like to the peripheral apparatus from the second host computer.

REFERENCES:
patent: 4418382 (1983-11-01), Larson et al.
patent: 4837680 (1989-06-01), Crockett et al.
patent: 5280585 (1994-01-01), Kochis et al.
patent: 5307462 (1994-04-01), Hastings
patent: 5323393 (1994-06-01), Barrett et al.
patent: 5386517 (1995-01-01), Sheth et al.
patent: 5499378 (1996-03-01), McNeill, Jr. et al.

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