Browse Prior Art Database

Store Channel Status Command

IP.com Disclosure Number: IPCOM000092881D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 18K

Publishing Venue

IBM

Related People

Annunziata, EJ: AUTHOR [+2]

Abstract

This store channel status command provides a mechanism to a programmer so that command chaining of variable length records is realized and the lengths of these records are identified along with other unusual conditions, i. e., incomplete last byte. This command allows command chaining to be effectively utilized in the gathering of data where the length of records is unknown and the time interval between records can be extremely short.

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Store Channel Status Command

This store channel status command provides a mechanism to a programmer so that command chaining of variable length records is realized and the lengths of these records are identified along with other unusual conditions, i. e., incomplete last byte. This command allows command chaining to be effectively utilized in the gathering of data where the length of records is unknown and the time interval between records can be extremely short.

The command, when implemented in an I/O channel eliminates search routines, bit identifiers, and the usual program interruption handling required to identify the location of the last unit of data. The handling of an I/O interruption, priority susceptible, and the required issuance of a new start I/O instruction to permit further data reception, can take prohibitive time resulting in the loss of unrecoverable data.

This command, when inserted alternately in a chain of read commands, causes the channel to store, in main storage, at the address location specified in the command, the current command address plus eight, the residual count of the previous executed command, and other status conditions that are desirable to a programmer. The execution of this new command is handled somewhat similar to a transfer-in-channel command found in computers. It is subject to the same programming restrictions of that command.

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