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Chapter 0 Introduction 1 Types of computers • Personal Computers (microcomputers) Desktops, Laptops, Notebooks, Tablets • Smartphones • Mainframes and minicomputers – Enterprise computing • Smartphones (?) • Analog (and hybrids) computers • Computer systems generally consist of different types of computers

Chapter 0 Introduction1 Types of computers Personal Computers (microcomputers) –Desktops, Laptops, Notebooks, Tablets Smartphones Mainframes and minicomputers.

Dec 22, 2015



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  • Slide 1
  • Chapter 0 Introduction1 Types of computers Personal Computers (microcomputers) Desktops, Laptops, Notebooks, Tablets Smartphones Mainframes and minicomputers Enterprise computing Smartphones (?) Analog (and hybrids) computers Computer systems generally consist of different types of computers
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  • Chapter 0 Introduction2 Computer Components Processor Controls other components Main memory (DRAM) Secondary storage devices attached via cables Hard disk drive Flash drive CD/ DVD drive Data input/output devices Monitor Keyboard Mouse Printer Cameras, speakers, modems, adaptors, etc.
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  • Chapter 0 Introduction3 Notebook computers Small, lightweight computers Wireless connection Contains adaptor (NIC) for mobility Keyboard, disk drives, speakers, monitor are all in the unit Touchpad or attached mouse External mouse can be attached through serial port
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  • Chapter 0 Introduction4 Storage devices CD and DVD-ROMs Read, but not write data CD-Rs (write once) CD-RWs Read, write and change data Flash drives Read, write, and change data Hard drives (internal and external)
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  • Starting your computer On/off switch It can take a few minutes to power on, load data from hard disk to main memory, configure computer PC will ask for and verify your password (on many systems) PC provides a cursor (pointer) on the screen that you control with your mouse Chapter 0 Introduction5
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  • Stopping your computer Close all of your applications Chose Windows shut down option (and follow directions) Apple (click Apple icon in upper-left corner and select shut down) If machine is shared with several users, logoff but leave the machine on. Chapter 0 Introduction6
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  • Microsoft Windows Windows 7 and 8 are Operating Systems Controls all hardware Controls user interface Accepts users input Displays output Windows 1.0 and then 2.0 (1990) and all later models added a GUI (graphical user interface) to the Windows OS Chapter 0 Introduction7
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  • Keyboard Keyboard is chief input device for PC Specifically for text data; file names; etc. Important keys ESC cancel an operation Function keys (F1-F12) save, help, print Print Screen (Shift or Alt + PrtSC) Backspace and delete keys Insert (toggle from typeover mode) Chapter 0 Introduction8
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  • More keyboard keys Arrow keys (move cursor) Home and end keys (to beginning or end of line; document) Page up and page down (screen scrolling) Tab, caps lock, shift Ctrl and Alt typically are part of key combinations (try Ctrl + Alt + Del) Chapter 0 Introduction9
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  • Keyboard keys Try winkey + f as short cut to search computer files Within Windows application Ctrl + f for search Winkey + r short cut to the run program bar Winkey + d as short cut to get to the desktop Chapter 0 Introduction10
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  • Executing a program Use winkey + r when you know the programs name Click on globe/ all programs/ and search for the program name May be multi-level menu Accessories/ paint Chapter 0 Introduction11
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  • Application interface to users When PCs were first introduced, each application had a different interface, typically combination of keys for each command Some applications will still support these short cuts shown in a drop down menu Windows applications have mostly a standard user interface Ex: MS-Office file menu to save, open, print Chapter 0 Introduction12
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  • Print a document File tab/ print/ gives options Single, multiple copies Page numbers, selection, all Select printer Print preview Good idea to check to see how the document fits on the page FAX or email document Chapter 0 Introduction13
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  • Save and retrieve documents Click on save as You need a file name Windows application automatically adds an extension You need to know the folder and path So that you can find it again Note that Windows shows you the most recently used documents for retrieval Chapter 0 Introduction14
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  • Web Basics The Internet is a global interconnection of computer networks, all running the same software TCP/IP protocol suite. The World Wide Web is a resource available over the Internet Different sites connected by links Hypertext Transfer Protocol is used to connect web pages Chapter 0 Introduction15
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  • Connecting to the Web Internet service providers maintain connections to the Internet Users must have ISP connections to use the web Access web pages through a browser Internet Explorer, Firefox, Netscape, Chrome, Safari, Bing Each web page has a unique URL Links consist of URLs Chapter 0 Introduction16
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  • Getting information on the Web Sites are variable in quality Some may be corrupted (viruses, worms) Some allow anyone to enter incorrect information Wikipedia, for example If you use Wikipedia, check view history and discussion tabs Chapter 0 Introduction17
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  • E-mail First Internet application Computer networks transmit messages between hosts E-mails are stored in mailboxes, so that sender and receiver can communicate asynchronously Most e-mail servers today are encrypted Check for https on URL; lock Chapter 0 Introduction18
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  • Getting an email account Most ISPs provide an e-mail account Multiple ones are a good idea. Keep one as a throw-away account. Google provides a free email account. Email addresses have a user ID followed by @ followed by the domain of the email provider Do not place any spaces in an email address Chapter 0 Introduction19
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  • Security and Privacy Physically secure your machine Secure the password Change all default passwords, particularly that of the administrator Disable the guest account go to Control panel/ user accounts Or place guest account in Search programs and files Chapter 0 Introduction20
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  • Avoiding malware Such as viruses, worms, Trojan horses It is difficult to rid yourself of malware once it is on your computer It is easy to infect others if you are infected How do you prevent infection? Chapter 0 Introduction21
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  • Avoiding malware Do not download or install pirated software with a flash drive Do not open e-mail or e-mail attachments from unknown sources Use antivirus software You also need a good Firewall Symantecs or Kasperskys Internet Security Chapter 0 Introduction22
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  • Antivirus software maintenance Regular updates Regular scans of full system Make sure that protection software is set to run continuously when the system is up and to check all e-mail messages and downloaded files. Chapter 0 Introduction23
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  • Other preventive mechanisms Use Apple computers?? Be careful of the sites that you visit Disconnect yourself from the Internet whenever you can Patch your OS regularly Chapter 0 Introduction24
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  • Windows firewall In the Search program and files bar, enter System and Security Check Windows Firewall (or if you have installed another one, check that one) Chapter 0 Introduction25
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  • Pop Up Ads Block spyware Do not click on pop-up ads Do not close the pop-up by clicking the x on the top right Right click on the pop-ups button on the taskbar (bottom of screen) Select close option from the menu Chapter 0 Introduction26
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  • Pop up ads Browser should be configured to block pop- up windows Firefox: Tools, options, content//block pop-up windows Also disable Javascript if possible Internet Explorer Tools/ Internet Options/ Privacy/ turn on pop-up blocker Chapter 0 Introduction27
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  • E-commerce transactions Try to buy from well known sites Be sure you spell the URL correctly Attackers purposely buy domain names that are slight variants of reputable sites Look for encrypted sites https:// shttp:// Lock icon Chapter 0 Introduction28
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  • Avoid e-mail scams Dont wire money to Nigeria Do not try to opt out of receiving future messages Mailers will know that the address is in current use Spammers can get control of your friends address book Chapter 0 Introduction29
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  • Phishing Email that masquerades as legitimate source (Microsoft, FDUs administration, your bank) Link takes you to false site Asks for account information, password, etc. Clicking on link may even download virus Spam filters sometime target legitimate mail If I dont answer your mail within 3 days, check with me in class Chapter 0 Introduction30