18 October – Day 16
CSC 350 Review
OS Job
OS Modules
function
structure
---CSC350 notes---
I. Operating Systems Overview
A. Systems Software
What is software? define …
note: great use for CS:AO! If you don’t recall a term, topic, etc –
consult this text
Three major components of systems s/w: booting software, translation
software, OS
Why is systems software different from application software or
programming language?
Looks “inward;” makes using the H/W easier for users and other S/W
3 Levels/layers of software built upon the hardware
Application Package – solve user problem
Programming Language – create application package
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Systems S/W – manage system
First two levels look “outward” to the user
Last level looks “inward” to the H/W
analogy: stewardship vs. evangelism
B. Operating System (OS)
Definition: Master control S/W
Goal: Control and manage the H/W and other S/W of the system
Operating system makes using the H/W easier for users &
applications
Three major jobs of an OS:
CSC 490 Course Notes and Outline, © Dr. Gary Locklair, Fall 2006
