Browse Prior Art Database

Low End Extended Architecture Feature

IP.com Disclosure Number: IPCOM000064231D
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Larson, LE Meredith, VE [+details]

Abstract

A Low End Extended Architecture (LEXA) feature provides an assisted execution environment with enhanced speed and space requirements, and is accomplished by a process of executing natively implemented instructions in a simulated execution environment. The environment 11 periodically issues a "START LEXA" instruction. At this point, the processor 12 executes the instructions directly, acting as if the native instructions were the instructions being simulated. This instruction is constructed in such a manner that it is possible for the pseudo-simulated environment 11 to become the controlling logic of the system. As a result, with the LEXA feature, the ordinary idea of controlled and controlling environment no longer applies.