Browse Prior Art Database

Read-Only Store Patching Methodolgy

IP.com Disclosure Number: IPCOM000067170D
Original Publication Date: 1979-Jun-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

Authors:
Bauer, WJ Dodt, WC Kirkpatrick, CR Ripberger, RA Robinson, FL [+details]

Abstract

In system applications requiring a processor with an associated memory for program storage (control store), it is often cost effective from a manufacturing standpoint to use nonvolatile read-only memory. If this approach is taken, it is usually necessary to include some method of altering or patching the memory if a program change becomes necessary. Such a method must be implementable in the field with a minimum impact on the availability of the system to the user.