Browse Prior Art Database

Method Of Tracing Asynchronous Multiple Level Interrupts

IP.com Disclosure Number: IPCOM000066844D
Original Publication Date: 1979-May-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

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

Abstract

The figures show a method of tracing asynchronous multiple level interrupts using a microcode program. Knowing which level interrupts were serviced and in which order and if multiple level interrupts were taken is very helpful in defining problems in a priority interrupt system. The standard procedure is to provide a history register that logs all instructions in sequence. The most recent instruction overlays the oldest instruction such that the last performed series of instructions are available.