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Browse Prior Art Database

Checking Sequential Data Blocks

IP.com Disclosure Number: IPCOM000048459D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Nolta, AH: AUTHOR [+3]

Abstract

In many instances, sequential data blocks bear sequential record indicating numbers. Occasionally, numbers may be omitted or duplicated in transferring data signals from a data source, such as a DASD (direct-access memory device), to a random-access memory. The sequence or count fields "C" in the data are diverted to a control store. Upon completion of the transfer, a computer analyzes the received count fields to verify whether or not the just transferred data blocks have sequential record numbers. In this manner, data in the memory corresponds to that of the identification in the data source.

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Checking Sequential Data Blocks

In many instances, sequential data blocks bear sequential record indicating numbers. Occasionally, numbers may be omitted or duplicated in transferring data signals from a data source, such as a DASD (direct-access memory device), to a random-access memory. The sequence or count fields "C" in the data are diverted to a control store. Upon completion of the transfer, a computer analyzes the received count fields to verify whether or not the just transferred data blocks have sequential record numbers. In this manner, data in the memory corresponds to that of the identification in the data source.

Any peripheral system attachable to a host (not shown) or a data source can be a DASD. The DASD which supplies data in a count key data format (CKD) to a host can indicate sequential data to be transferred from the data source to an intervening memory. When this occurs, the computer activates the transfer from the data source to the memory and transfers the associated count field "C" to a control store. Upon completion of the data transfer, the computer analyzes the received count field for nonsequential data record numbers. The continuity of the sequential numbers is checked upon completion of the data transfer from the source to the memory. Omitted numbers can be verified and noted in the control store. A directory is constructed for accessing the data stored in the memory. Such directory constitutes an indirect addressing scheme of known...