Browse Prior Art Database

ROS Patch Mechanism

IP.com Disclosure Number: IPCOM000040188D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Inomata, T Matsubara, S Takei, T [+details]

Abstract

This article describes the patch mechanism in the microcode stored in ROS (read only storage) of the machine to fix a microcode problem in the subsystem which has the down-load capability from the diskette of the controller/file-server to the machine. The new ROS Patch Mechanism requires the following resources. - File structure which enables down-load. - Transfer Vector Table which lists all entry addresses of microcode modules. Branch, call are done via this table. - RAM (random access memory) space where the defective microcode module can be copied. (Image Omitted) - Diskette drive to read the patch information (file) in the controller/file-server with the down-load capability. As shown in Fig.