Computers can be broadly classified by their speed and computing power.
| S.No. | Type | Specifications |
|---|---|---|
| 1 | PC (Personal Computer) | It is a single user computer system having moderately powerful microprocessor |
| 2 | Workstation | It is also a single user computer system, similar to personal computer however has a more powerful microprocessor. |
| 3 | Mini Computer | It is a multi-user computer system, capable of supporting hundreds of users simultaneously. |
| 4 | Main Frame | It is a multi-user computer system, capable of supporting hundreds of users simultaneously. Software technology is different from minicomputer. |
| 5 | Supercomputer | It is an extremely fast computer, which can execute hundreds of millions of instructions per second. |
PC (Personal Computer)
A PC can be defined as a small, relatively inexpensive computer
designed for an individual user. PCs are based on the microprocessor
technology that enables manufacturers to put an entire CPU on one chip.
Businesses use personal computers for word processing, accounting,
desktop publishing, and for running spreadsheet and database management
applications. At home, the most popular use for personal computers is
playing games and surfing the Internet.
Although personal computers are designed as single-user systems,
these systems are normally linked together to form a network. In terms
of power, now-a-days high-end models of the Macintosh and PC offer the
same computing power and graphics capability as low-end workstations by
Sun Microsystems, Hewlett-Packard, and Dell.
Workstation
Workstation is a computer used for engineering applications
(CAD/CAM), desktop publishing, software development, and other such
types of applications which require a moderate amount of computing power
and relatively high quality graphics capabilities.
Workstations generally come with a large, high-resolution graphics
screen, large amount of RAM, inbuilt network support, and a graphical
user interface. Most workstations also have mass storage device such as a
disk drive, but a special type of workstation, called diskless
workstation, comes without a disk drive.
Common operating systems for workstations are UNIX and Windows NT.
Like PC, workstations are also single-user computers like PC but are
typically linked together to form a local-area network, although they
can also be used as stand-alone systems.
Minicomputer
It is a midsize multi-processing system capable of supporting up to 250 users simultaneously.
Mainframe
Mainframe is very large in size and is an expensive computer capable
of supporting hundreds or even thousands of users simultaneously.
Mainframe executes many programs concurrently and supports many
simultaneous execution of programs.
Supercomputer
Supercomputers are one of the fastest computers currently available.
Supercomputers are very expensive and are employed for specialized
applications that require immense amount of mathematical calculations
(number crunching).
For example, weather forecasting, scientific simulations, (animated)
graphics, fluid dynamic calculations, nuclear energy research,
electronic design, and analysis of geological data (e.g. in
petrochemical prospecting).
See more on Computer Tutorial
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