Browse Prior Art Database

Simple Structure for Instantaneous Deletion of Records in Bubble Memory

IP.com Disclosure Number: IPCOM000052657D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Bongiovanni, G: AUTHOR [+2]

Abstract

A structure is described in a major/minor loop bubble memory for removi an unwanted record from the major loop in a bit-parallel fashion without going through the read station.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 60% of the total text.

Page 1 of 2

Simple Structure for Instantaneous Deletion of Records in Bubble Memory

A structure is described in a major/minor loop bubble memory for removi an unwanted record from the major loop in a bit-parallel fashion without going through the read station.

Conventionally, a record in a major/minor loop bubble memory consists of one bit from each minor loop. The minor loops are rotating synchronously. To reach a record, all the bits are transferred in parallel to the major loop, shifted to the read station, and read serially. Before all the bits are shifted to the read station, no more transfer from the minor loops to the major loop is allowed. In general, one can either transfer a copy of the record from the minor loops to the major loop (non-destructive read), or transfer the record directly (destructive read).

However, if we want to delete a record from the minor loops or after we have transferred a record to the major loop and found out that the record is unwanted, it is desirable to remove the record immediately so that the next transfer of record from minor loops can be carried out without delay.

A simple structure is presented in the figure specifically for this purpose. A T- I bar configuration illustrates the operation. Of course, it can be implemented in any other kind of bubble technologies such as chevrons, contiguous disks, etc., with equal simplicity.

In the figure, the bubbles 10 are on the major loop 12. They occupy position 1 while the magnetic field is p...