Introduction & Operating Systems

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What a computer is?

What cheating is?

What a GUI is?

Do you know:

Introduction

• Housekeeping—Changes to Syllabus• Grading—three MPs and three exams• Handing in work online

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https://agora.cs.uiuc.edu/display/cs105/

Writing an email to an instructor

• Go to Web Preferences

• Add a Signature!• Include earlier

email in yours

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What is a computer?

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This course only deals with electronic computing machines

Computers have REALLY changed over time!

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Hardware

• Hardware– “The parts of a computer system that can be

kicked.” —Henri Karrenbeld

– Example of a kicking

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Hardware CS105 Spring 2010# 7

Inputs

RAM Chip

keyboard

Outputs

CPU on a chip – the Microprocessor (s)

ROM built in, BIOS

You will read about secondary storage in your text.

• Secondary storage includes hard drives, CD-ROMs, DVDs, and Flash Memory cards like you find in cell phones, digital cameras, etc.

• Most secondary storage will maintain its data without any external source of power.

• See Unit B in your Computer Concepts book, Computer Hardware

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What can do wrong with hardware?• Memory, disks, CD-ROM drives, floppy drives, video

cards, mother boards, CPUs, fans, power supplies, monitors, disk controllers can all FAIL!

• Rarely, chips can make calculation errors.

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Software in a Computer

computerhardware

Windows Vista

Applications

• Software : Instructions or Computer Programs

• Hardware: Electronic Devices & Circuits

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What is an Operating System?

• Hardware needs a manager to tell it – what to do– when to do it– how to do it

• The (OS) controls all• A: Input• B: Output

• C: processing• It manages the data and the memory and

appearance

Operating Systems Software

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Windows VistaUNIX (LINUX)Mac OS X

Handhelds --Palm OS

UNIXfor email servers

iPods

Power of an Operating System

• An operating system produced by one company can intentionally make it difficult to use software programs produced by another company

• For those people wary of Microsoft, Linux is a free Unix-type operating system originally created by Linus Torvalds with the assistance of developers around the world.

• More information here: http://www.linux.org/

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Interface—Graphical, using Icons

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The iPhone has an unusual user interface (for a phone)--GUI

Cheating• The penalty for cheating will be 0 on the MP or exam, an F in the

course if caught twice.

• Passively allowing someone to copy your work is cheating.

• More than 3 students working on an MP is cheating.

• It is cheating to show an MP or honors project to someone else.

• Ignorance of the law is no excuse…

http://admin.illinois.edu/policy/code/article_1/a1_1-402.html

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More on cheating• Question: Am I cheating if

another group turns in my work and says they did it?

• Yes. We are not blessed with "lie detectors.“ Keep other people out of your laptop or computer, keep it password protected.

• *Don’t tell people your password (duh)

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To Summarize:• What is a computer ?

• What is a GUI?

• What is cheating?

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