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Training Computer Review and Recognition

In the factory during the production phase are written using special techniques.


PROM (Programmable Read Only Memory) - (Programmable Read Only Memory) of the computer some
information (such as opening the program) produced and later on usually empty stores with special techniques
programs that can be transferred and read only memory is a type that can not be overwritten later. electricity
affected by the outage.

EPROM (Erasable Programmable Read Only Memory) - (Writable Erasable Read Only Memory) Normal
and can only be read on the computer while the memory is not affected by the power outage. However, the private
methods may be deleted. Or on the information and programs available for download. Are produced in the factory empty.

RAM (Random Access Memory) - (random Access Memory) both readable and writable random
access memory. Are affected by power outages. Computer electrical signals with this information you can write to memory,
modify and delete.

Need to talk about the main memory capacity of the memory unit from both sides without mentioning
We can not. Memory capacity memory to be able to mention you will need to know the units of measurement.

Memory Measurement Units

They both have computer data storing and processing electrical or magnetic signals are
according to whether the treats. So according to the presence or absence of signal information, it does have value or another
means. Therefore you do not have a computer or with a combination of the concepts of information obtained in various ways
I would.

The most basic information unit of measurement is bits (0 or 1, or do not have this unit, which may be either true or false representation
is.) All other information is obtained from the various arrays of 0 or 1. We will understand the difficulty
These values ​​are processed by the binary number system. If the decimal number system people use in daily life. Therefore you
Data supplied by the computer with the computer system to be converted into binary numbers stored and treated.

Of eight bits obtained by juxtaposition measure bytes.

8 bits = 1 byte

1 byte = 1 character (sometimes one letter)

1024 bytes = 1 kilobyte

1024KB = 1 megabyte

1024MB = 1 GB

1024GB = 1 terrabyte

0 .255 with 8 bits up to any number is expressed or 256 different values ​​can be handled.

Of Computer Peripherals

In a computer system that provides the necessary information to be more permanent (from a power outage
unaffected) units. Generally, in both written and read hosting of webpages and information storage
are used as unit. These units are stored as magnetic information.

Hard Drive-HDD (Hard Disk)

High capacity and high speed, computer mounted, can not be removed except for technical intervention,
According to the information read by magnetic methods, is a side unit. Secondary Memory them by name in some sources
may be observed.

Floppy disk drives and floppy disks.

Tasks and objectives are the same as hard disk completely. To the capacity is low. Floppy Disk, Floppy
drives (Floppy Disk Drivers) used fitted. that is portable floppy disks. Portable from one point to another.
However, the drive on the computer is fixed. Floppy disks with a nominal capacity and size of standard features
includes.

As the size of 3.5 "(3.5 inches) and 5.25" (5.25 inches) so that there are two different edge lengths.
However, the capacity of a floppy disk or a change in size of any changes in its mission


does not bring.

CD-ROM (Compact Disc Read Only Memory) drive

And general information can be read by a laser beam used in archiving is a side unit. Compact discs
normally used at home data is available mostly on music CDs but not different from
are disks. On this disc or music tracks that can read the information to be used with drive units
is difficult. As we said at the beginning of the laser beam based on the principle of reflection or reflection reads information.

These discs can be read-write operation on the natures and their special drivers are needed.
However, this CD-ROM in terms of the operating system of a user different from the normal use of an HDD or floppy
It is not. Only on this unit to remove, edit or format operation performed.

These discs will need to write a CDRW device. If you have such a device and a blank
If the CD-ROM's our media that can be written to the media.

DVD-ROM Drive

As the capacity of the CD-ROM in case of insufficient capacity of up to 4.7 GB DVDs
is use. appearance and literacy principles that are the same as the CD-ROM drive of the hardware görnüş
CD-ROM is the same.

Are media that can be read in the same way. but with a special blank DVD-ROM, DVD-RW devices
writable media. Any information can not be erased once written out of the media.

Flash Memory and Other Memory Cards

Finger is the size of the USB drive plugged into the USB port of your computer is used.
Capacities 1GB, 2GB, 4 GB or 8 GB can be. Learn ways to store electrical and deletes it therefore
can be used unlimited times in the absence of electricity does not lose the information on. From a place of knowledge
to be moved to a location is quite ideal device.

Memory cards and SIM card sized cards are used to store information. has a special slot
and attaching them can be read and written. This type of slot USB connected computers that do not match, again in
box size can be read and written via the vehicles.

Tape Backup (Tape Backup Unit)

Magnetic media and information similar to tape cassettes often used for backup
units. However, these cassettes (or more generally, in the words of the cartridge) to be read or written to a drive
There is a need in his name Tape Backup unit. They usually include special programs for use, and this
through programs that are used.

Input Devices

Do not use the user's computer data or command the units. Old items are listed below.

Keyboard (Keyboard)

When entering text or commands on your computer when we had to use the keys on
where is the unit of data entry. Is most frequently used for the units, the use of progressive wider issues
will be described. Q or F on the keyboard are caused by the first letter of the name. However, as the use of a
does not vary. In addition, 101, 102 or 105-key to be found on a number of independent keys
shows.

Mouse (Mouse)

Some on-screen text, icon, command and so on. marking objects, drag, designations and
allow selection input unit.

DOS, UNIX, XENIX operating systems such as Linux basic commands when using the keyboard as the input device
Windows, Xwindows, and so on. Visual basic commands in the operating system as a mouse input device is used.
Use of wider issues will be discussed later.




Joystick (Game Handle)

While playing the game, and users are used to represent the item in the game (people, vehicles, etc.). Moving in the appropriate direction
Avoid entry is the element that transmits commands to the computer.

Optical Reader (Optical)

Processed with pencil on paper transfers to a computer input by reading the signs
units. Intensive examination centers which uses quick data entry or survey units.

Scanner (Scanner)

The picture on any paper or card to the computer as a digital image transfer tool. each
what a logo is used to transfer pictures to the computer.

card Reader

When the keyboard is not widespread on the programs and data are developed and perforated cards
was transferred to the computer by the reader. However, almost no currently not used.

Barcode Reader

Read bar codes on products in the market, the product code is the fitting. this device
only line of products which were obtained from the rest of the code is sent to the system by computer software running in the background
taken care of.

Output Units

Its command to the user's computer and data to users of the result reached after processing
units. Old items are listed below.

Monitor (Screen)

The working principle is the same like on TV and this unit not only receiver that occurs on the computer
A glass gets you direct to the client (the TV tube) is used. The result consists only in the computer
gets you direct user is used.

Printer (Printer)

Information that occurs on the computer, depending on the user's request may be required to be taken by pressing down on paper. is this
We also aim printer units are used. Printer consumables that they use and they are pressed simultaneously by unit
are categorized in different ways.

a) The unit according to Bass
i) Character printers who print
ii) Point printers that print
iii) printers that print page
b) Use exerted by their
i) Inkjet Printers
ii) printers that use the Ribbon
iii) applying toner printers
scribe

Drawing on a wide and long sheets of paper that fitted. Generally, architects, engineers, advertisers
and is used by designers.