-Creating Communites on the Living Web - MySpace: online community for young people.
- Flickr: creates a community for people to share pictures
-Computers are no longer a luxury, but instead its a commodity.
- Computers and there applications are included in our daily lives.
- All computers take in information called input and give out information called output.
- Hardware: The physical part
-Software: The instruction that tells hardware how to transform the input data.
- In 1939: Konrad Zuse compeleted the first programmable, general-purpose computer.
- Around the same time the British government was assembling a top-secret team of mathematicians and engineers to crack Nazi- military codes.
- 1943: the team led by mathematicians Alan Turning and others completed Colossus, considerded by many to be the first electronic digital computer.
-1944: Thanks to a one million dollar grant from IBM, Harvard prof. Howard Aikwn developed the Mark I
-John Mauchly and J. Presper Eckert helped the U.S. effort in World War II by constructing a machine to calculate trajectory tables for new guns.
-Vacuum tubes: were used in early computers.
-Transistors: replaced vacuum tubes starting in 1956
-By thw mid-1960's transistors were replaced by integrated circuits.
-Integrated circuits brought:
- increased reliability
- smaller size
- higher speed
- higher efficency
- lower cost
- 1971: The first microproceeor was invented by Intel engineers.
- The personal computer revolution began in 1970:
- Desktop computers havent completely replaced big computers, wich have also evolved.
-Embedded Computers
- Special-purpose compter:Dedicated computers that perform specific tasks.
- Controlling the temp. and humidity.
- monitoring your heart rate.
- monitoring your house security system.
-The program is etched on silicon so it cannot be altered. this is called firmware.
-Personal Computers:
- PC's serve a single user at a time.
-Workstations: high-end desktop computers with massive computing power used for high-end interactive applications.
-Portable Computers:machines that are not tied to the desktop.
- Serves
- computeres degined to provide software and other resources to other compters over a network.
- mainframes:
- Used by large organizations, such as airlines, for big computing jobs
- communicate with mainframe through terminals
- multiple communications at one time through process of timesharing.
- Supercomputers:
For power users who need access to the fastest most powerful computers made.
-The emergence of networks.
- Connect devices together
- 1960's: Internet deeveloped with backing of the U.S. government.
- The internet explosion-over a billiob people with Internet access by the end of 2005
-Web Browsers:
- Programs that, in effect, serve as navigable windows into the web.
-Hypertext links:
- Tie together millions of Web pages created by diverse authors.
-internet supports varied activities:
- ebay used to make interantional transactions
- Real-time multiplayer games.
-In the history of out society we have had:
- An agricultural age
- An industrial age
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