1 / 22

Understanding Computers

Understanding Computers. Computer Applications Mrs. Stern. Computer History 3 Generations of Computers. The Vacuum Tube Years The Era of the Transistor Transistors on a Chip. The Vacuum Tube Years (1946-1958). Computers were: Huge Slow Expensive Often undependable

cicily
Download Presentation

Understanding Computers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Understanding Computers Computer Applications Mrs. Stern

  2. Computer History3 Generations of Computers • The Vacuum Tube Years • The Era of the Transistor • Transistors on a Chip

  3. The Vacuum Tube Years (1946-1958) • Computers were: • Huge • Slow • Expensive • Often undependable • ENIAC was built in 1946 • 18,000 vacuum tubes • Took up a lot of space • Gave off a lot of heat Cooled down by a gigantic air conditioner & still overheated regularly

  4. ENIAC Electronic Numerical Integrator and Calculator

  5. The Era of the Transistor (1959-1964) • Transistor was like the vacuum tube only better: • Faster • More reliable • Much smaller • Cheaper to build • Gave off virtually no heat • 1 transistor replaced 40 vacuum tubes

  6. What it looked like 1964 Transistor Beads Stem Transistor Radio

  7. Transistors on a Chip (1965-current) • With the invention of Integrated Circuits or Microchip, thousands of transistors fit into one microchip • The number of transistors that fit onto a chip doubled every two years • Today: Millions per microchip

  8. Computers today can: • Carry out instructions in billionths of a second • Are sometimes the size of a watch • Since electricity travels 1 foot in a billionth second • The smaller the distance the faster the speed

  9. What are computers made of? A combination of: Hardware & Software

  10. What is Hardware? • Hardware – the tangible, physical equipment that can be seen and touched • Keyboard • Monitor • Printer • Computer chips

  11. What is software? • Software – the intangible instructions that tell the computer what to do • PowerPoint • Windows XP • Sims City • Oregon Trail • Programmers – write the instructions that tell the computer what to do

  12. Computers are Simple Devices • They perform FOUR basic functions: • Store data and programs • Function unattended due to its ability to interpret and follow instructions it is provided • Do arithmetic calculations • Perform logical comparisons 

  13. What makes it such a powerful device? • It only has FOUR basic functions • Its tremendous speed • Its accuracy • Its ability to store vast volumes of data

  14. Where are the instructions stored? In the computers memory: • Internalmemory (ex. microchips) • RAM(random-access memory) This is temporary & can be erased. (ie: Microsoft Office Xp, Internet Explorer) • ROM (read-only memory) - This is permanent & can not be changed or erased. • Externalmemory (ex. DVD’s & hard drives)

  15. Input & Output Devices Input device: hardware that permits the computer to accept data  • Keyboard • A mouse • Bar-code scanner • Light pen • Touch display screen • Speech recognition device

  16. Output Devices Hardware which reports the information in a form we can understand • monitor • printer • robots • sound or music speakers

  17. Processors • Is the computer chip that receives & carries out the instructions from the software • All computers big & small have processors also known as Central Processing Units or CPUs • Referred to as brains of the computer

  18. Functions the processor performs: • Receives & temporarily stores instructions & data to be processed • Moves & changes stored data • Arithmetic calculations • Makes decisions of logic (ex: determines if two numbers are equal)

  19. External Storage • They hold data outside the memory of the computer. • They connect to the computer & are under the control of the processor at all times • Most common: • USB Flash Drive • External hard drives • CD/DVD

  20. Binary System • BrainPop - Binary http://www.brainpop.com/

  21. Computer Memory Memory is measured in bytes

  22. You should NOWunderstand computers

More Related