Multilevel Viewpoint of a Machine

Oerating System

Level 3

Operating System or Software:

• Control executing processes on the system.

• Protect system resources: Memory and input output devices and etc.

• Assembly language instructions often pass through level 3 without modification.

This level is always interrupted.

For Instance : If reading data from file, the operating system carries it out step by step, in the manner a micro program would carry out an ADD instruction.

14- Multilevel Viewpoint Of A Machine- Operating System - Computer Architecture & Organization

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