Browse Prior Art Database

Programmable Map and Trace Instrument

IP.com Disclosure Number: IPCOM000056083D
Original Publication Date: 1980-Oct-01
Included in the Prior Art Database: 2005-Feb-13

Publishing Venue

IBM

Related People

Authors:
Lloyd, R Ovies, H Rosado, JL Willson, DJ [+details]

Abstract

The Programmable Map and Trace Instrument (PMATI) is a test tool which maps and traces via hardware interface, that is, by physically connecting to the system address bus. Mapping and Tracing of microcode instructions are two useful techniques used in the development and debugging of computer systems software and microcode. The first is a process by which instructions executed by a system are flagged or pointed out and displayed in an X-Y plane which contains all the possible executions. Tracing consists of creating a trace or audit trail of these instruction sequences. This is accomplished by storing instruction after instruction in the order in which they were executed. A trace will not only display the instructions that were executed, but the order and number of times they were executed.