What Kind of Computers Does at&t Sell to Low Income Families

Computers can be classified, or typed, in many ways. Some mutual classifications of computers are given below.

Classes by purpose [edit]

Classes of Computers

Estimator

Analog

Hybrid

Digital

Super Computers

Mainframe Computers

Mobile Computers

Mini Computers

Micro Computers

Notes:

Microcomputers (personal computers) [edit]

Microcomputers became the nigh mutual blazon of calculator in the late 20th century. The term "microcomputer" was introduced with the advent of systems based on single-chip microprocessors. The best-known early on organization was the Altair 8800, introduced in 1975. The term "microcomputer" has practically get an anachronism.

These computers include:

Desktop computers – A case put under or on a desk. The display may be optional, depending on employ. The case size may vary, depending on the required expansion slots. Very small computers of this kind may exist integrated into the monitor.
Rackmount computers – The cases of these computers fit into 19-inch racks, and maybe space-optimized and very flat. A dedicated display, keyboard, and mouse may non be, simply a KVM switch or built-in remote control (via LAN or other means) tin be used to gain console admission.
In-auto computers (carputers) – Congenital into automobiles, for amusement, navigation, etc.
Laptops and notebook computers – Portable and all in i case.
Tablet calculator – Like laptops, just with a touch on-screen, entirely replacing the physical keyboard.
Smartphones, smartbooks, and palmtop computers – Small handheld personal computers with limited hardware specifications.
Programmable estimator– Like small handhelds, but specialized in mathematical work.
Video game consoles – Fixed computers built specifically for entertainment purposes.
Handheld game consoles – The same as game consoles, only small and portable.

Minicomputers (mid-range computers) [edit]

Minicomputers (colloquially, minis) are a class of multi-user computers that lie in the middle range of the computing spectrum, in betwixt the smallest mainframe computers and the largest single-user systems (microcomputers or personal computers). The term supermini calculator or merely supermini was used to distinguish more powerful minicomputers that approached mainframes in capability. Superminis (such as the DEC VAX or Information General Eclipse MV/8000) were unremarkably 32-scrap at a fourth dimension when about minicomputers (such as the PDP-11 or Information General Eclipse or IBM Series/ane) were 16-bit. These traditional minicomputers in the final few decades of the 20th century, found in small to medium-sized businesses, laboratories and embedded in (for example) hospital True cat scanners, ofttimes would be rack-mounted and connect to one or more terminals or record/card readers, like mainframes and different almost personal computers, simply require less space and electrical power than a typical mainframe.

Mainframe computers [edit]

The term mainframe computer was created to distinguish the traditional, large, institutional computer intended to service multiple users from the smaller, unmarried-user machines. These computers are capable of handling and processing very large amounts of information quickly. Mainframe computers are used in large institutions such as government, banks, and big corporations. They are measured in MIPS (meg instructions per second) and tin can answer to hundreds of millions of users at a time.

Supercomputers [edit]

A supercomputer is focused on performing tasks involving intense numerical calculations such every bit weather forecasting, fluid dynamics, nuclear simulations, theoretical astrophysics, and complex scientific computations. A supercomputer is a calculator that is at the front-line of current processing capacity, particularly speed of adding. The term supercomputer itself is rather fluid, and the speed of today'southward supercomputers tends to get typical of tomorrow's ordinary computer. Supercomputer processing speeds are measured in floating-betoken operations per 2nd, or FLOPS. An example of a floating-betoken performance is the adding of mathematical equations in real numbers. In terms of computational capability, retentivity size and speed, I/O technology, and topological problems such as bandwidth and latency, supercomputers are the most powerful, are very expensive, and not cost-effective just to perform batch or transaction processing. These computers were developed in 1970s and are the fastest and the highest capacity computers

Classes past function [edit]

Servers [edit]

Server usually refers to a figurer that is dedicated to providing one or more services. A server is expected to be reliable (eastward.g. error-correction of RAM; redundant cooling; self-monitoring, RAID), fit for running for several years, and giving useful diagnosis in case of an error. For fifty-fifty increased security, the server may be mirrored. Many smaller servers are really personal computers that have been dedicated to provide services for other computers.

A database server is a server which uses a database application that provides database services to other reckoner programs or to computers. Database management systems (DBMSs) frequently provide database-server functionality, and some database management systems (such as MySQL) rely exclusively on the customer–server model for database access while others (such equally SQLite) are meant for using every bit an embedded database. Users admission a database server either through a "forepart terminate" running on the user'southward computer – which displays requested information – or through the "back cease", which runs on the server and handles tasks such as information assay and storage.
A file server does not unremarkably perform computational tasks or run programs on behalf of its customer workstations but manage and store a large drove of computer files. The crucial office of a file server is storage. File servers are usually found in schools and offices, where users use a local area network to connect their client computers and utilise Network-fastened storage (NAS) systems to provide data access.
A web server is a server that can satisfy client requests on the Globe Wide Spider web. A web server can, in full general, contain one or more websites. A spider web server processes incoming network requests over HTTP and several other related protocols. The main part of a spider web server is to store, process and deliver web pages to clients. The communication betwixt customer and server takes place using the Hypertext Transfer Protocol (HTTP). Pages delivered are most oft HTML documents, which may include images, style sheets and scripts in addition to the text content.
A terminal server enables organizations to connect devices with an RS-232, RS-422 or RS-485 series interface to a local expanse network (LAN). Products marketed as final servers can exist very elementary devices that do not offering whatever security functionality, such as data encryption and user authentication. These provide GUI sessions that can be used by customer PCs that work someway like a remote control. Only the screen (and audio) output is shown on the client. The GUI applications run on the server, data (similar in files) would exist stored in the same LAN, thus avoiding problems, should a client PC be damaged or stolen.

A server may run several virtual machines (VMs) for different activities, supplying the same environment to each VM every bit if it ran on dedicated hardware. Different operating systems (Os) can therefore be run at the same time. This technology approach needs special hardware support to exist useful and was first the domain of mainframes and other big computers. Nowadays, most personal computers are equipped for this task, but for long-term operation or critical systems, specialized server hardware may be needed.
Another arroyo is to implement VMs on the operating organization level, and so all VMs run on the aforementioned OS instance (or incarnation), but are fundamentally separated to not interfere with each other.

Workstations [edit]

Workstations are computers that are intended to serve one user and may contain special hardware enhancements not found on a personal estimator. By the mid 1990s personal computers reached the processing capabilities of mini computers and workstations. Likewise, with the release of multi-tasking systems such as Bone/2, Windows NT and Linux, the operating systems of personal computers could do the job of this class of machines. Today, the term is used to describe desktop PCs with loftier-performance hardware. Such hardware is usually aimed at a professional, rather than enthusiast, market (due east.m. dual-processor motherboards, error-correcting retentiveness, professional graphics cards).

Information appliances [edit]

Data appliances are computers specially designed to perform a specific "convenient" part—such every bit editing text, playing music, photography, videography etc. The term is most unremarkably applied to bombardment-operated mobile devices, though in that location are as well clothing devices.

Embedded computers [edit]

Embedded computers are computers that are a part of a motorcar or device. Embedded computers generally execute a plan that is stored in non-volatile memory and is only intended to operate a specific machine or device. Embedded computers are very mutual. The bulk are microcontrollers. Embedded computers are typically required to operate continuously without being reset or rebooted, and once employed in their job the software unremarkably cannot exist modified. An automobile may contain a number of embedded computers; however, a washing auto or DVD histrion would incorporate but one microcontroller. Embedded computers are chosen to encounter the requirements of the specific awarding, and near are slower and cheaper than CPUs found in a personal estimator.

Classes by usage [edit]

Computers in a library for public use

Public computer [edit]

Public computers are open for public uses, possibly equally an Interactive kiosk. There are many places where one tin apply them, such as cybercafes, schools and libraries.

They are normally burn-walled and restricted to run merely their pre-installed software. The operating system is difficult to change and/or resides on a file server. For example, "thin client" machines in educational establishments may be reset to their original state between classes. Public computers are generally non expected to continue an individual's information files.

Personal calculator [edit]

A personal computer has one user who may also exist the owner (although the term has besides come also mean whatsoever estimator hardware somewhat like the original IBM PC, irrespective of how it is used). This user often may utilise all hardware resources, has complete access to any part of the computer and has rights to install/remove software. Personal computers ordinarily shop personal files, and often the owner/user is responsible for routine maintenance such as removing unwanted files and virus-scanning. Some computers in a business concern setting are for i user only are also served past staff with protocols to ensure proper maintenance.

Shared figurer [edit]

These are computers where dissimilar people might log on at different times; unlike public computers, they would accept usernames and passwords assigned on a long-term basis, with the files they see and the computer'southward settings adjusted to their particular account. Often the important data files will reside on a key file server, so a person could log onto different computers yet notwithstanding encounter the same files. The computer (or workstation) might be a "thin customer" or Ten last, otherwise information technology may accept its own disk for some or all system files, but unremarkably will need to be networked to the balance of the organisation for total functionality. Such systems normally require a system administrator to set up and maintain the hardware and software.

Display computer [edit]

Computers that are used just to display selected material (unremarkably audio-visual, or simple slide shows) in a store, meeting or trade show. These computers may have more capabilities than they are existence used for; they are likely to have WiFi and so be capable of Cyberspace access, only are rarely firewalled (but have restricted port admission or monitored in some mode). Such computers are used and maintained as appliances, and non normally used as the chief store for important files.

Classed by generation of computer technology [edit]

The history of computing hardware is often used to reference the unlike generations of computing devices:

First generation computers (1940-1955): Information technology used vacuum tubes such as the 6J6^[ane] or peculiarly designed tubes - or even mechanical arrangements, and were relatively wearisome, free energy-hungry and the earliest computers were less flexible in their programmability.
Second generation computers (1956-1963): It used discrete transistors, and so were smaller and consumed less power.
Third generation computers (1964-1970): It used Integrated Circuits (ICs), the main departure betwixt hardware in computers of the 1960s and today being the density of transistors in each IC (kickoff with Pocket-size Scale Integration chips like the Transistor-transistor logic (TTL) SN7400 gates with twenty transistors, through Medium Scale Integration and Large Scale Integration to Very-large-scale integration (VLSI) with over ten billion transistors in a single silicon-based IC "bit".
Fourth generation computers(1971-present): It uses Microprocessors, every bit millions of ICs were built onto a single silicon-based chip. Since and then form factor of computers reduced, chore processing & graphic rendering improved and it became more than bombardment-powered with the appearance of personal mobile devices such as laptops, tablets, smartphones etc.

Come across as well [edit]

List of reckoner size categories
Bong's law of computer classes
Analog computers
Feng'south classification
Flynn's taxonomy

References [edit]

^ Dyson, George (2012). "seven". Turing's Cathedral - The origins of the Digital Universe . New York: Pantheon Books. p. 124. ISBN978-0-375-42277-v.

External links [edit]

Four types of Computers

marryatwhowd1991.blogspot.com

Source: https://en.wikipedia.org/wiki/Classes_of_computers