Computers

Computers

1. What is a computer?

   • A computer is an electronic device that manipulates information, or data.

2. What is inside a computer?

   • Motherboard
     • The main printed circuit board in general-purpose computers and other expandable systems.
   • CPU/Processor
     • Is the brain of the computer where most of all the “thinking” and calculating take place.
   • RAM
     • Is a hardware device that allows information to be stored and quickly retrieved on a computer.
   • Hard disk drive
     • Is a memory hardware device that permanently stores and retrieves information.
   • Power supply unit
     • Is a hardware component that supplies power to the computer.
   • ROM
     • It stores things like the instructions for the computer to start up when it is turned on. ​​​​​​​

3. Types of computer systems

   • Mainframe
     • They are gigantic in size, quick, extremely costly and expensive.
     • They support more than 1000 remote computers and can work as a “HOST” for different and multiple operating systems.
     • Generally utilized and used as a part of educational organizations, railway reservations, in a portion of the administration segment and in the Insurance Sector.
   • Super Computers
     • They are generally used as a part of complex Scientific applications, climate determining, or specific fields.
     • They are accommodated in a large Air Conditioned room, some of them can take an entire building for its installation.
     • They have fast, amazing capacity or storage limit, expensive and require gigantic space
   • Mini Computer
     • They are quite smaller in size, less expensive, and speedier yet not as quick as a mainframe or supercomputer,
     • They are utilized or used as a part of private company organizations, and in the production, department to monitor or screen the manufacturing process.
     • They help multi-client Operations and have a very difficult operating system to deal with and can function as a “HOST” in a system where 100 terminals can be supported.
   • Micro Computer
     • They have an input unit that encourages the users to give instruction or data to the control unit, and an output unit that performs display information in desired or wanted form.
     • Despite this they are widely used among people or end-user clients, due to their low cost.
     • They are the smallest and the cheapest as compared with minicomputers, mainframe, and supercomputers.

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