Chap03 - Chapter 03 CECS 230 Click to edit Master subtitle...

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Click to edit Master subtitle style Chapter 03 CECS 230 Spring 2009
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CHAPTER 3 – Operating Systems Name of first operating system?
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Early Operating Systems
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OS – Batch Processing First come – First served All data must be available at start of run All required resources must be loaded or available Unable to interact with user with intermediate results “Good” applications: “Bad” applications:
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OS – Interactive processing User interacts via terminal User can review intermediate results User can direct program steps Only one user and one program at a time
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OS – Time Sharing Multiple users Rotate programs’ access to CPU
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OS - Multitasking Smaller time slices Appearance of several program running simultaneously
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OS – Real Time Processing Real time = Fast enough to respond to environment Usually have input from sensors and feedback/control systems How fast is fast enough?
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Operating System Software Booting
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Chap03 - Chapter 03 CECS 230 Click to edit Master subtitle...

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