Drive for connection to multiple controllers in a digital data s

Details Drive for connection to multiple controllers in a digital data s Drive for connection to multiple controllers in a digital data s

1974-08-15

1977-02-08

Springborn, Harvey E.

Communications: electrical

Digital comparator systems

G06F 306

Patent

active

040074480

ABSTRACT:
A secondary storage facility for a data processing system including a drive unit which connects to a pair of controllers. Switching circuits in the drive unit couple a data transfer section and a common control section for the transfer section to one or the other controller in response to selection signals. Other control sections connect to respective ones of the controllers to receive signals and a selection circuit responds by transmitting the selection signals. If one controller tries to transfer information to or from the common control section while the selection signal designates the other controller, the transfer does not occur. If the attempted transfer is to the common control section or from predetermined locations in the common control section, the attempt is retained so the drive can signal back through the other controller when the selection signal can change. If the attempted transfer is from the common control section, then the drive transmits back to the controller a unique code.

REFERENCES:
patent: 3061192 (1962-10-01), Terzian
patent: 3214739 (1965-10-01), Gountanis et al.
patent: 3623014 (1971-11-01), Doetz et al.
patent: 3693161 (1972-09-01), Price et al.
patent: 3840859 (1974-10-01), Vigil et al.

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