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Browse Prior Art Database

Overlapping of Read/Record Functions

IP.com Disclosure Number: IPCOM000076669D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hoe, JW: AUTHOR

Abstract

In systems in which an I/O typewriter is in two-way communication with an electronic buffer such as a dynamic shift register, it is desirable to have some sort of bulk store such as a magnetic card.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

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Overlapping of Read/Record Functions

In systems in which an I/O typewriter is in two-way communication with an electronic buffer such as a dynamic shift register, it is desirable to have some sort of bulk store such as a magnetic card.

An inexpensive system can be provided by using a single magnetic card and drive. Previously recorded data is first read from the magnetic card into the buffer and following editing or revision rerecorded on the same card. To increase systems throughput, an overlap between the recording onto the card and the revision of the data in the buffer can be accomplished by providing, as is conventional, an operating flag in the buffer which defines the point that the operator is working, and a record flag which defines the point in the buffer from which data is output to the magnetic card. The systems logic upon complete read in of the data into the buffer will allow the record flag to chase the operating flag, recording all data up to the operating flag such that the time required for recording back onto the card is minimized. This is due to the fact that in the usual case, the data will have been recorded back onto the magnetic card completely, down to the point of the last operator revision due to the relatively large amount of time required for operator revision, as compared against the relatively high-speed recording onto the card.

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