Computer

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Computer

• Electronic device
• Accepts data - input
• Processes it according to a given set of
  instructions
• Produces results - output

Computer
2

• Input, Output, Computer Program
• Input unprocessed data
  manipulated by the computer
• Output processed information or results
  produced by the computer
• The set of instructions
• that the computer follows
• is called a computer program

3
Computer System

• hardware
• the physical equipment used to process a data
• software
• computer programs

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Hardware
5
Hardware
6
Input/Output Devices

• Input devices
• keyboard, mouse
• enter data and programs into
• the computer
• Output devices
• printer, monitor
• display the results processed
• by the computer

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Memory

• Main Memory
• Nonpermanent
• Rapid Access
• Low Capacity

• Secondary Storage
• Permanent
• Non Rapid
• High Capacity

Bit - Binary Digit Byte 8 bits KB KiloBytes
1024 bytes 2?? MB MegaBytes 1,048,576
bytes 2?? GB GigaBytes 2????bytes
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CPU Central Processing Unit

• Control Unit
• Directs the processing operations
• Coordinates the flow of data to Main Memory and
  ALU

• Arithmetic Logic Unit (ALU)
• performs
• Arithmetic operations
• Logic operations

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Software

• Operating Systems
• DOS
• UNIX
• Windows
• Application Software
• Word
• Power Point
• Emacs

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Compilation Process

• High Level Language

Compiler
Machine Language