Computers come in different varieties of types designed for different purposes, with different capabilities and cost, based on their advancement, sizes and hardware performance.
Types of computers:
There are three main types of computer which are namely: microcomputers, minicomputers and mainframe

1. Microcomputers:

This is that with a microprocessor chip as it's CPU Microcomputers are often called personal computers (PCs) because they are designed to be used by one person at a time, personal computers are typically used at home, at school, or at business, popular uses for microcomputer's include Word-processing, surfing the web, send and receive emails, spreadsheet calculations, database management, photo editing, creating graphics, playing music videos and games. microcomputers or personal computers therefore come in different varieties such as desktop computer and laptop computers, personal digital assistance, palmtop, workstation etc....
do not worry we'll examine each of these packages in turn.

Desktop computers:

These are are larger than the personal computers laptop, not meant to be portable they usually sit in one place on a desk or tables and are plugged into a power source. The casing of the computer holds the mother board, drives, power supply unit, and expansion cards, this casing may lay flat on a desk under it, or it may be a tower that stands vertically on the desk or under it. The computer usually has a separate monitor either CRT or LCD attached to it, although some designs have a display built into the case, with a separate keyboard and mouse allowing the user to input data and commands for the computer to process.
Laptop or notebook computers:
These are small and lightweight enough to be carried around, unlike the desktop computer laptops run on battery power and can also be plugged into a power source, they typically have a built-in LCD display that folds down to protect the display when the computer is carried around, they also feature a built-in keyboard and some kind of pointing device (such as touchpad). laptop computers usually cost more than desktop units of equivalent processing power because the smaller components needed to build laptops are more expensive.

Personal digital assistants (PDAs):

This is a handheld microcomputer that trades off power for small size and greater portability. PDAs communicate with defaulting desktop computer and with each other either by cable connection, infrared (IR) beam, Bluetooth or radio waves. PDAs are normally used to keep track of appointment calendars, to-do lists, address books and for taking notes.
Palmtop computers:
A palmtop or hand held PC is a very small microcomputer that also sacrifices power for small size and portability. these devicess typically look more like a tiny laptop than a PDA, with a flip-up screen and small keyboard they may use Windows CE or similar operating system for handheld devices. Some PDAs and palmtops contain wireless networking or cell phone device so that users can check email or surf e web on the go.
Workstations/servers:
A workstation is a powerful, high-end microcomputer, they contain one or more microprocessor CPUs, they may be used by a single user for applications requiring more power than a typical PC (render complex graphics, or performing intensive scientific calculations). A workstation PC is a type of desktop PC used to support engineering and technical users who perform heavy mathematical computing, computer - aided design (CAD), and other applications requiring a high end processor, a workstation-class microcomputers may be used as a server computers that supply files to client computers over a network. This class of powerful microcomputers may be used as server computers that supply files to client computers over a network.
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2. Minicomputers:
A minicomputer is a multi-user computer that is less powerful than a mainframe. This class of computers became available in the 1960's when large scale integrated circuits made it possible to build a computer much cheaper than the then existing mainframes.
3. Mainframe computers: 
This set of computers are large, powerful computers that handle the processing for many users simultaneously (up to several hundred users). The name mainframe originated after minicomputers appeared in the 1960's to distinguish the larger systems from the smaller minicomputers. Users connect to the mainframe using terminals and submit their tasks for processing by the mainframe. Mainframes typically cost several hundred thousand dollars. They are used in situations where company wants the processing power and information storage in a centralized location, mainframes are also now being used as a high -capacity server computers for networks with many client workstations.

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