Browse Prior Art Database

Addressing Systems

IP.com Disclosure Number: IPCOM000079721D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Evans, JR: AUTHOR

Abstract

In plural computer setups, different direct-access storage devices (DASD) may have different physical characteristics. The addressing schemes for each of the respective DASD's can be substantially different. An addressing system capable of accommodating various physical characteristics of various DASD's with a large, intermediate storage, but without the physical constraints, can be a desirable feature.

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Addressing Systems

In plural computer setups, different direct-access storage devices (DASD) may have different physical characteristics. The addressing schemes for each of the respective DASD's can be substantially different. An addressing system capable of accommodating various physical characteristics of various DASD's with a large, intermediate storage, but without the physical constraints, can be a desirable feature.

A first DASD has a first physical characteristic and corresponding format for a record, for example, record RX, having the CCHH indicia, record number R, key length KL, data length DL, with a gap separating the identifying portion just described from the data portion labeled DATA. The next record in that DASD is separated by a second gap indicated by the three hyphens, etc. When the first DASD transfers its data signals to a transfer system, the data is compacted by eliminating the gaps with all the information being maintained. The transfer system modifies by zeroing the CCHHR portion of the identifying field, substituting a logical address (LWGADDR) for the CCHHR, and storing it in the intermediate storage. Accessing systems in the transfer system correlate the CCHHR to the logical address for the first DASD. The second CPU may desire to access the intermediately stored data via the second DASD, which has the second set of physical characteristics; i.e., its CCHHR notations are C1C1H1H1, not compatible with the first DASD. Accordingly, the tra...