Data The words, numbers, figures, sounds, and graphics that describe people, events, things, and ideas
Then and NowENIAC (The Electronic Numerical Integrator And Calculator)1946-2-14 Made In USA
Then and Now1982 - ABC 80Made in SwedenNow – Macbook ProMade in China
What is a computer? An electronic machine that canbe programmed to accept data(input), and process it intouseful information (output).Data is put in secondarystorage (storage) forsafekeeping or later use.
Computer Systems Hardware All the Physical parts of a Computer System (thebits that you can see and touch) Software Software is a collection of programs that help thecomputer hardware to work properly
Input Devices Keyboard Touch-SensitiveScreen Mouse Microphone Digital Camera Digital Video Camera Joystick ScannerThe Physical Parts of a Computer SystemThe Physical Parts of a Computer Systemwhich allows data to be entered into awhich allows data to be entered into aComputer SystemComputer System
keyboard Used to inputtextual informationto the computer.
mouse Lets you feedinstructions to thecomputer by simplypointing andclicking in agraphicalenvironment.
Scanner A scanner is a devicethat can read text orillustrations printedon paper andtranslate theinformation into aform the computercan use.
Output Devices An output device is a devicewhich allows data to bedisplayed or passed out of acomputer system Printers Monitor Load speaker Projector
Monitor Screen that displayswhat is going on inthe computer.
Printera printer is aperipheral whichproduces a hard copyof documents stored inelectronic form, usuallyon physical print mediasuch as paper ortransparencies.
Random-Access Memory Allows computers tostore and retaininformationStores part of operating systemStores part of the application programsStores your files as you work on them
Storage Devices We require backingstorage to storeprograms and files Without backingstorage all our datawould be lost when weturn the computer offBacking Storage MediaHard DiskFloppy DiskCD-ROMDVD-ROMUSB Stick
Primary Storage – Hard disk Size inGigabytes Magnetictechnology Fast accessA hard disk is a memory used mainly in computers.
Secondary Storage - CD/DVD *-R - recordableburn once *-RW - rewritableerase and burnagain 650 MB for a CD 4.7 GB for a DVD 8.5 GB for DualLayer DVDs In-expensive
Flash memory – USB stickFlash memory is anon-volatile computermemory that can beelectrically erased andreprogrammed.
The Processor The processor orCentral Processing Unitis the brain of thecomputer The performance of theprocessor is measuredin Giga Hertz (GHz) We send programs tothe processor to get thecomputer to dosomething
Thank you! We are computer hardware asimple introduction We hope you have some Harvest