Introduction To Information Technology
Introduction To Information Technology
Introduction To Computer System
The word computer is derived from the Latin word " Computare or Compute ". Compute means just to calculate. So, According to this definition " Computer is a machine which takes input from the users , process these inputs and finally provide output."
The working Principle of Computer
Characteristics of computer
- Word Length
- Speed
- Accuracy
- Storage
- Versatility
- Diligence
- Automatic
- Electronic
Application of Computers
- Science & Technology
- Commerce & Industry
- Medical
- Engineering
- Weather forecasting
- Astronomy
- Defense
- Hotel management
- Artificial Intelligent
- Simulation or Modeling
- Word Processing
- Spread sheet
Classification or Types of Computer
On the basis of it's size or capacity, work or operation, model & brand, computer can be divided into four parts:On the basis of its size or capacity
- Mainframe computer
- Mini computer
- Micro computer
- Super computer
On the basis of its work or capacity:
- Digital computer
- Analog computer
- Hybrid computer
- IBM PC
- IBM Compatible
- Apple/Macintosh
On the basis of Model:
- XT(Extended Technology) computer
- AT (Advanced Technology)computer
- PS/2(Personal System/2) computer
Generation of computer:
Generation means step in technology. It provides a framework for the growth of computer industry. There are five computer generations known till today.
- First generation(1940-1956): Vaccum tube
- Second generation(1956-1963): Transistor
- Third generation(1964-1971):Integrated Circuits
- Fourth generation(1971-present or 1989 or 1990): Microprocessor
- Fifth generation(Beyond & Present or 1989 – Present): Bio chips or AI
History and Development of Computers
Early Computing Machines:
- Abacus
- Leibnitz Arithmetic Machine
- Pascaline (Pascal Arithmetic Machine)
- Charles Babbage’s Analytical and Difference Engine
- Hollerith Punch Card Machine
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