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Analogue and digital
There are two type of computer analogue and digital.
Analogue computer working with only with physical quentityil digital computer whit numbers.
Analogue is device that simulates usually physical system digital computer difference from the one onalogue computer in that it deals with numbers and not physical quantity.
Device not simulate of another system analogre computer.
Abacus the first digital computers.
Operator countrols the seguence of operation.
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What is a Computer.
The term computer is used to describe a device made up of a combination of electronic and electromechanical components.
A computer system is a combination of five elements.
Hardware
software
people
procedures
data/ information
when one computer system system is set up to communicate with another computer system connectivity becomes the sixth system element.
software is the term used to describe the. Instructions that tell the hardware how to perform a task. Without software instructions the hardware doesh't know what to do.
people hower are the most important component of the computer system.
The data is raw material while information is organized processed refined and usefre for decision making.
Computer is used to convert data into information. Computer is also used to strore information it the digital form.
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Hardware
Computer hardware can be divided inro four categories
1. Input hardware 2. processing hardware 3. storage hardware. 4 output hardware.
Input hardware
the purpose of the input hardware is to collect data and convert it into a form saitable for computer processing.The most common input device is keyboard.
It looks very much like a typewriter. the mouse is a hand held connected to the computer by small cuble.
The light pen uses light sensitive photoelectric cell to signal screen position to the computer. Electronic cameras are becoming very popular among the consumers for their relatively low price and convenience.
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Output hardware
The purpose of output hardware isto provide the user with the mqans to view information produced by the computer system.
Monitor is a component with a display screen for viewing computer data television programs etc. Hardware can fill several floors of a large office building or can on your lap.
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Processing hardware
The purpose of processing hardware is retrieve interpret and direct the execution of software instructions provided to the computer.
The Central Processing Unit is the brain of the computer.
Memory is the system of component of the computer in which in formation is strored. the are two types of computer RAM and ROM.
RAM (random access memory)
ROM (Read only memory)
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Storage hardware
The purpose of storage hardware is to store computer instructions and data in a form that is relatively permanent and retrieve when needed for process ing.
Hard disk floppy disk and CD-ROM. Hard disk is a rigid disk coated with magnetic material for storing programs and relatively large amounts of data.
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Floppy disk - thin usually flexible plastic disk coated with magnetic material for storing computer data and programs.
CD-ROM (compact disk read only memory) is a compact disk on which a large amount of digitized read - only data can be stored.
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Types of Software.
Software - programs for directing the operation of a computer or electronic data. Programs usually foll in one of two categories system software and applications software,
System software controls standard in ternal computer activities.
Operating of system is a system software driver is a system programs are disigneg for the specific pieces of hardware.
The Developed of application software rely mostly on marketing research strategies trying to do their best to attract more users ti their software.
Communication software transferes data from one computer system to another.
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20.Operating System.
when computers were in to daced in the 1940 and 50's every program written had to provide instractions that told the. Computer how to use devies such as the printer how to store imbocmation on a disk as well as how to perfom several offer tasks not necesiarly related to the program.
they also provide disk monagement by letting yas store information in files. the operating system lets you run programs such as the basic word processor. Lastly the operating system provides several of its own commands that help to use the comput.
Dos was developed by a Microsoft.
Windows NT (New Technology) ison operating system developed by Microsoft.
Windows 2000, HP are the most popular user criented operating system with a buiendly inter base and mustitasking copabilites.
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22.What is Chat
Another common service of the internet is the internet Relay Chat or Chat chat allows a group of people using aliases to send messages to one another immediately. Once connected the user is brought into contact with a large number of other users from all around the world. All the messages typed within a chat room appear almost simultaneously on the computer screens of all participants for that chat room.
Chat rooms are usually active 24 hours a day.
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Newsgroup
Another popular service is called Usenet. usenet offers access to newsgroup for group discussions on specific to pics. Some newsgroup focus on buying or selling various consumer items.
there are thousand of newsrgoup and once a user has gained access to Usenet there is no cost to subscribe to them.
This person reviews not only what someone has sent tj the newsgroup but also what others have written in responce.
The conted of news - groups reflects the varied internets viwpoints and moral values of those who use them so disxretion is needed.
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The world wide web
The part of the Internet called World Wide Web allows authors to use an old-fashioned idea -that of footnotes - in a new way.
The highlighted word or image is a clue to the reader that an associated Internet resource often another document exists. This Internet document can be fetched and displayed immediately for the reader. The document may even be on a different computer and located in another country.
Web also supports the storage and retrieval or playing of photographs graphics animations videos and sounds. Everyone can obtain and play a short color movie of the current theories regarding the universe and hear the narration through computer audio system.
World Wide Web
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