1. Computer Fundamentals

2. A Computer Is a System Input Processing Output Data is entered into the computer Becomes useful information The data is processed by adding, subtracting, and sorting

3. Example Input Processing Output Data for student registration A schedule for the student is created. Registration requests are checked against the lists (database), and if room is available, the student is added to the class list

4. Computer Components Hardware: Equipment Keyboard, monitor, system, scanners, mouse, etc. Microchips, motherboard, ports Software: Instructions Programs Hardware & Software are required for the computer to work.

5. Hardware System Input Processing Output Storage Input hardware include: Keyboard Mouse Scanner Voice Output hardware includes: Printer Screen Sound Processing hardware is microprocessor (i.e. Intel Pentium Processor)

6. Input Hardware: Mouse As the mouse is moved, the cursor on the screen mimics the mouse movement. Types: Ball – motion of the ball in the mouse detected by wheels within the mouse. Gets dirty. Depends on smooth surface. Optical – small camera replaces the ball. Stays clean. Can be used on any surface. Wireless - no wire connecting the mouse to the computer. I

7. Input Hardware: Keyboards Text and commands are entered using the keyboard Specialized keys include: Escape (ESC) Delete & Backspace Number Lock (Num Lock) Arrow keys Caps Lock Function Keys Enter Key Types:

8. Input Hardware: Scanners Text and graphics are digitized to become computer files. Types: Flatbed (most common) Handheld

9. Processing Hardware: Microprocessors 2 types: Intel architecture: Used with IBM- compatible PCs Intel Pentium Celeron AMD Motorola: Used with Macintosh computers

10. Microprocessors + RAM Microprocessor (CPU) Adds, subtracts, sorts, etc. Storage (RAM) All data and instructions must be loaded into RAM to be used by the microprocessor Data & instructions move back and forth Hard Drive: used for virtual RAM, and to store files for later use.

11. Printers Inkjet small droplets of inks Color Versatile Inexpensive to buy, expensive to maintain

12. Laser Usually black and white (some color available but rare) High quality print Expensive to buy, less expensive to print Faster than inkjet

13. Hardware System: Storage Input Processing Output Storage Internal or Primary RAM (Random Access Memory) Volatile External or Secondary Storage Magnetic Disk Hard drive Floppy drive Zip Disk CD-ROM 2 Types of Storage

14. Units of Storage Size: Bit (binary digit) = 0 or 1 Byte = 8 bits = 1 character K (kilobyte) = 1,024 bytes Mb (megabyte) = 1 million bytes Gb (gigabyte) = 1 billion bytes

15. How Much Can a Computer Hold? Primary storage (RAM) Units of 32 megabytes (Mb) Example: 32 Mb, 64 Mb, 128 Mb The higher the number, the more the computer can process at once Secondary storage (disk or CD-ROM) Hard drives – gigabytes Floppy disks – 1.4 Mb Zip disks – 100 Mb & 250 Mb CD-ROM – approximately 400 Mb

16. Computer Software System Software Operating System – instructions that make the hardware work Microsoft Windows for IBM-Compatible PCs Macintosh OS for Macintosh computers Others: Unix, Linux, etc. – not as common Utilities Formatting Housekeeping

17. Computer Software (continued) Application Software Word Processing – Word, WordPerfect, Works, etc. Graphics editing Web authoring Any software that a specific purpose or application.

18. How to Format a Disk PC Right-click on My Computer on the desktop Click Explore Right-click on the disk drive where the disk you need to format is contained – usually the floppy disk drive (usually drive A) or the Zip Disk Click Format