1 / 11

How Computers Work

How Computers Work. Part 2 20 September 2006. About the Term Project. Your paper must take a position and be a proponent for it Your presentation must cover both positions. Partnerships . Meet your partner Communicate, communicate, communicate Read your email Agree to working rules

stian
Télécharger la présentation

How Computers Work

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. How Computers Work Part 2 20 September 2006

  2. About the Term Project • Your paper must take a position and be a proponent for it • Your presentation must cover both positions

  3. Partnerships • Meet your partner • Communicate, communicate, communicate • Read your email • Agree to working rules • Meeting times • Work times • Communicating electronically • Before you hand in your summaries, you have 5 minutes • If you have problems, see me ASAP

  4. Simplified Model of a Computer processor • retrieves the • instruction • directs data movement Performs the operations Arithmetic Logic Unit Control Unit instructions data the information that it works on defines an algorithm MEMORY

  5. 1 = 0 Binary System • Everyone knows that computers store bits, right? • What does it mean? • All data is stored as a series of zeroes and ones • Why?

  6. |||| Representing Numbers • Additive system • ||||| ||||| • Every item represents 1 • Examples of additive systems? • Positional system • Value = face * place • 37 = 3*10 + 7*1

  7. Positional System • Base = number of different values in a position • Base 10 = 10 values: 0-9 • Base 2 = 2 values: 0-1 • Value of each position = power of base • b4 b3 b2 b1 b0 • Binary: 24 23 22 21 20

  8. 8 4 2 1 0 1 = 0 0 0 0 = 1 0 = 0 0 0 1 2 = 0 0 1 0 3 = 0 0 1 1 4 = 0 1 0 0 Binary Positional System

  9. Examples • 24 23 22 21 20 • 16 8 4 2 1 • Examples • 1111 = • 15 • 1000 = • 8 • 01100100 = • 100

  10. Data Types • Computer doesn’t know what the bits represents or what format is being used • Computer assumes that the instructions know the format of the data • What are the types of data? • Numbers, text, pictures, sound, instructions

  11. Data Types • Numbers: integers and floating point numbers (scientific notation) • Why do we need floating point numbers? • Text: Unicode, double byte • Languages and symbols (Word insert symbol) • Pictures: pixels • A very fine needlepoint • How to represent color? • Sound: different formats • Instructions

More Related