Computer System

Computer System

Input Unit/Device
1. E.g. keyboard, mouse
CPU
1. (Arithmetic & Locgic Unit)ALU
2. Control Unit (CU)
3. Memory /Primary memory
  1. (Ramdom Access MemoryRAM -Temporary memory
    1. Volatile -power switched off it is erased
    2. Data can be read and write
  2. Secondary Memory
    1. Secondary storage devices
      1. Hard Disk, CD & pen drive
    2. Permanent memory
  3. (Read Only Memory) ROM
    1. Data can read only
    2. Non volatile- power switched off data not erased
4. Cache memory
Output Unit(Device)
1. E.g Printer, Monitor
Computer Evolution
1. 500 BC
  1. Abacus
2. 1642
  1. Pascaline
3. 1834
  1. Analytic Engine
4. 1890
  1. Tabulating Machine
5. 1937
  1. Turning Machine
6. 1945
  1. EDVAC/ENIAC
7. 1947
  1. Transistors
8. 1970
  1. Integrated Circuits
Microprocessors
1. CPU on 1 chip called Microprocessors
  1. Microprocessor specifications based on
    1. Word Size
    2. Memory Size
    3. Clock Speed
    4. Cores
Data & its type
1. Structured
  1. Organized in tabular form
    1. E.g ATM transaction
2. Unstructured
  1. Not organized in predefined format
    1. E.g graphics data
3. Semi structured
  1. no well-defined structure but having internal tags
    1. E.g Email, htmal page
Hardware
1. Physical Components
  1. E.g Keyboard, mouse,screen,CPU
Software
1. Computer Programs
  1. Programming language
    1. High level
      1. E.g Python, c
    2. Low level
      1. E.g Assembly
2. Application s/w
  1. General Purpose
  2. Customized s/w
3. System s/w
  1. Operation system
    1. E.g Windows, Unix, Linux
    2. Types
      1. Single user
      2. Multi user
    3. Interfaces
      1. Command based
        E.g MSDOS, Unix
      2. GUI
        E.g Windows
      3. Touched based
        E.g Android
      4. Voice Based
        E.g. Android (Google now)
      5. Gesture based
        E.g Waving,eye motion
    4. O.s. Functions
      1. Process Management
      2. Memory Management
      3. File Management
      4. Device Management
  2. Language Translator
    1. Compiler
      1. E.g C, C++
    2. Assembler
      1. E.g Assembly
    3. Interpreter
      1. E.g Python, java
4. Utility s/w

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	Created by Aparna Dhirde over 4 years ago

	Copied by Aparna Dhirde over 4 years ago