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Direct, Asynchronous and Synchronous Storage Card Disclosure Number: IPCOM000061627D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09

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Bannon, RD Brown, LW Cannon, JW Minnich, WD [+details]


This article describes an arrangement wherein direct, asynchronous and synchronous operations are serviced, buffered and reconciled on a two- port storage card design. Existing technology is available to solve the problem of sharing dynamic, high density, low cost storage with synchronous CPU operation and asynchronous I/O operation. The direct asynchronous and synchronous storage card (DASSC) is a two-port card (CPU port and I/O port), that also includes facilities for direct CPU to I/O communication not utilizing the storage. Thus, three basic lines of communication are solved by this two-port design. Fig. 1 illustrates the entire DASSC operation. A 43-line storage control unit (SCU) interfaces the storage card.