Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Reverse Roll Mode Subpaging

IP.com Disclosure Number: IPCOM000052395D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Brady, T: AUTHOR

Abstract

When subpaging in a shift register-type storage device operating in roll mode, subsequent references to subpages beyond the first can cause processor delays. This is because after the initial reference to a page, references within the page are generally to the subpages having higher addresses than the initially referenced subpage. Because a roll-mode paging device permits freedom in the order of storage of data in the device, the following two organizations of data are suggested. 1. Subpages are stored in reverse sequence on the device, but the data within the subpages is stored in forward sequence. 2. All data is stored in reverse sequence within a page.

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

Page 1 of 1

Reverse Roll Mode Subpaging

When subpaging in a shift register-type storage device operating in roll mode, subsequent references to subpages beyond the first can cause processor delays. This is because after the initial reference to a page, references within the page are generally to the subpages having higher addresses than the initially referenced subpage. Because a roll-mode paging device permits freedom in the order of storage of data in the device, the following two organizations of data are suggested. 1. Subpages are stored in reverse sequence on the device,

but the data within the subpages is stored in forward

sequence.

2. All data is stored in reverse sequence within a page.

As on the average one-half of the page is brought into main storage before the reference subpage is available and this half page consists of subpages from the address range adjacent and higher than the referenced subpage, it is insured that all subpages read into main storage prior to the availability of the referenced subpage will be those with the highest probability of being referenced.

1