Browse Prior Art Database

Memory Addressing Technique

IP.com Disclosure Number: IPCOM000093937D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Heard, RS: AUTHOR

Abstract

Random access magnetic memories are provided by recording tracks on opposite sides of record members such as disks or chips. One location of the read-write heads corresponds to two of the tracks. The tracks are numbered consecutively from one edge of the record member. Even numbered tracks are on one side and odd numbered tracks are on the other side. Each odd numbered track One location of the read-write heads corresponds to two of the tracks. The tracks are numbered consecutively from one edge of the record member. Even numbered tracks are on one side and odd numbered tracks are on the other side. Each odd numbered track has a numerical value one higher than the even numbered track at the same location.

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 53% of the total text.

Page 1 of 2

Memory Addressing Technique

Random access magnetic memories are provided by recording tracks on opposite sides of record members such as disks or chips. One location of the read-write heads corresponds to two of the tracks. The tracks are numbered consecutively from one edge of the record member. Even numbered tracks are on one side and odd numbered tracks are on the other side. Each odd numbered track One location of the read-write heads corresponds to two of the tracks. The tracks are numbered consecutively from one edge of the record member. Even numbered tracks are on one side and odd numbered tracks are on the other side. Each odd numbered track has a numerical value one higher than the even numbered track at the same location.

In order to address a new track, it is necessary to move the read-write heads from the old to the new location and energize the proper one of the read-write heads. This is accomplished by changing the old track address y as required to the even numbered track at the old location. If the new track address x is greater than the new track address y, then the result of subtracting the modified addresses even or odd track is being addressed. For example, if the new address x is six 0110 and the old address is three 0011, then the old address y is changed to two 0010. The subtraction provides a difference of five 0101.

If the new track address x is smaller than the old track address y, the same procedure is followed. The presence or absence of the low-order bit of the remainder of the subtraction op...