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Picocode Addressing Ros/Ram Organization

IP.com Disclosure Number: IPCOM000041904D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03

Publishing Venue

IBM

Related People

Authors:
Pauporte, A Sazbon, D Thery, P [+details]

Abstract

This article relates to the implementation of the machine control picocode in such a way that it can be modified without significant impact on the machine cost and performance. In the machines controlled by picocode, the picocode is generally implemented in a read only storage (ROS). However, for fast machines having a short basic cycle, high speed ROS units are required. These high speed ROS units are not programmable, and consequently the picocode cannot be modified. The picocode cannot be implemented in a random-access memory (RAM) since high speed and high density RAM will be required, which has a significant impact on the machine cost.