Browse Prior Art Database

Data Transfer With Dynamic Priority Determination

IP.com Disclosure Number: IPCOM000098761D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

West, RL: AUTHOR

Abstract

A computing system which has a plurality of record storage media such as the rotating magnetic disk files A, B, n is provided with auxiliary apparatus. The latter permits simultaneous addressing of each file for a particular record and also establishes a transfer of data to or from that record location which first moves into position for transfer. A saving in access time is realized with this method when compared with fixed sequence access methods.

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Data Transfer With Dynamic Priority Determination

A computing system which has a plurality of record storage media such as the rotating magnetic disk files A, B, n is provided with auxiliary apparatus. The latter permits simultaneous addressing of each file for a particular record and also establishes a transfer of data to or from that record location which first moves into position for transfer. A saving in access time is realized with this method when compared with fixed sequence access methods.

A number of records which consist of related bits of information such as customer's name, account number, etc., are stored in each track of an individual disk. Each file has an access mechanism AM in which a transducing head H is incorporated for reading or writing the information bits. Each file has an associated access address register AR. A data synchronizing channel is provided in the system. The channel buffers data passing between the files A, B, n and the computer and includes a scanner, a source of control pulses, storage for access addresses received from the computer and temporary storage for data passing in a serial mode to or from the files and also in a parallel mode to or from the computer.

For illustrative purposes, three addresses A-2-9-8, B-3-7-6 and n-1-4-5 are assumed to have been received from the computer and entered in parallel into the address storage AS. These are transferred to the respective disk file address registers AR upon receipt of an initiating pulse, Start Transfer. Each address indicates: file, disk, track and record desired. Each access mechanism AM is initially servoed into data transfer position with respect to a particular disk according to the disk track portion o...