Output Device of Computer : What is Output Devices

What is Output Devices how it work output devices Output device full Output device

Output Devices

Types of Computer Monitor

(a) (Cathode Ray Tube) Monitor- Glass has one (in monochrome monitor) or three electron gun attached to it, which emits cathode rays. The picture is formed.

(Thin Film Transistor) Monitor- This monitor CRT is less bulky. Nowadays this monitor is more popular LCD (Liquid Crystal Display) Monitor-display Laptop at mobile

This TFT is thin and light used

(d) LED (Light Emitting Diode) Monitor- (Plasma Display Panel) Monitor- Technology is used in expensive TVs.

Some important words related to Monitor

(1) Interlaced / Non-interlaced- Such a monitor in which the painting on the screen happens twice. Odd lines are drawn at one time and in the second time even lines are monitored like this and called Interlaced monitor. The monitor in which painting is done only once is called Non Interlaced Monitor.

(2) Refresh rate- Hamas computer repeatedly paints the information present on the screen at some delay. The rate of image painting on the monitor is called refresh rate.

(3) Resolution and Pixel- The screen of the monitor is made up of small blocks. Each field is called a pixel (picture element). The product of the number of horizontal and vertical pixels present on the monitor is called resolution. For example, if a monitor resolution is 1024×768, it means that the monitor is made up of 1024 horizontal and 768 vertical pixels.

(4) Dot pitches- The distance between two pixels is called.

(5) Display Adapter – a circuit board that connects the monitor to the Mother Board

Display Adapters are the following

Visual Graphics Adapter (Array)

Monochrome Graphics Adapter


Colored Graphics Adapter

Enhanced Graphics Adapter Super Visual Graphics Adapter


Hercules Graphics Adapter

(2 Printers can be classified on the following basis

Printer Type

consists of

adds up. Some

two types

(1) On the basis of whether the printer head comes in contact with the paper at the time of printing or not, the printer (a) Impact Printer comes in contact with the printer head paper at the time of printing.

(b) The print head does not come in contact with the paper at the time of non-impact printer printing. (2) How much information is being printed by composing at a time. On this basis the printer

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(1) are of types

(a) Character printer- One character is created and printed at a time.

(b) Line printer – One line is created and printed at a time. (c) Page Printer – One page is created and printed at a time. (3) Printers are of two types on the basis of whether shaped characters are being used in the printer head or not.

(1) Shaped character printer

(2) Non shaped character are printer

Example of some printers (1) Daisy Wheel Printer- It is also called Petal printer because its head is of Daisy flower.

It is of shape on which shaped characters are attached. It is a character printer. (2) Dot Matrix Printer (DMP)- It has many holes in its head in the form of a matrix. Behind each hole there is a pin, which is to make the letter, the pin related to it comes out of the hole and on the ribbon.

Strikes so that the letter is made up of multiple dots. It is also a character printer. (3) Inkjet printer- A color box is used with the head of this printer. Which is called cartridge. It is filled with liquid ink. It prints information by spraying colors through the nozzle of the head. It is a non impact page printer. Its printing quality is highest. (4) Laser printer- This printer works similar to photocopy machine. drum in it and dry

Ink is used, an image is made on the drum and printed on the page. its printing speed

It is the highest and the printing cost is also low. It is a non impact page printer.

Multipart stationary cannot be printed by this printer.


The capacity of data storage is called memory. Memory is of type (1) Internal memory – which is directly mounted on the motherboard in the form of a chip.

(2) External memory – which is attached to the mother board with the help of wire.

Internal memory is also primary memory

(2) ROM (Read Only Memory) (3) Cache Memory

  • RAM- This is read write memory, that is, read and write from it. It is a volatile (temporary) memory. All the work done by the user is stored in RAM and the user is directly in contact with this memory. There are two types of RAM-
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(1) SRAM (Static RAM) (2) DRAM ( Dynamic RAM)

  • The information in SRAM is kept as long as there is power supply, whereas the information kept in DRAM starts flying after some delay. Before this flying time, it is read and written again there. This process is called refreshment. SRAM does not require refreshment. Whereas DRAM requires refreshment.
  • ROM- This is permanent memory. The setting store of peripheral (input/output device) is kept in ROM and it is used at the time of booting. After booting (the user does not have any work from the ROM. This memory is of three types

(a) PROM (Programmable Read Only Memory)

(b) EPROM (Erasable Programmable Read Only Memory) (c) EEPROM (Electrically Erasable Programmable Read Only Memory) • PROM is a type of ROM chip in which it can be written only once in EPROM b) For erasing information and writing again ultra violet rays are used while

EEPROM can be erased and rewritten information by electricity.

Cache- This memory is found between RAM and CPU. The rate of reading data from cache is higher than that of RAM. Frequently used data is brought from RAM and kept in cache and on CPU requirement, data is given from cache instead of RAM. This increases the processing speed of the CPU.

Secondary Memory

  • It is non volatile (permanent) memory. Whatever we save is stored in this memory. It is of the following types (1) Magnetic Core Memory

(2) Optical Memory (3) Flash Memory

  • Magnetic Core Memory- This memory is in the form of disk or tape. On which there is a coating of ferric oxide. Data is written and read by creating a magnetic field through the head. Examples of magnetic core memory are floppy disk, hard disk, magnetic tape.
  1. a) Floppy Disk- It is a plastic disk which is enclosed in a jacket. to read and write data

For this, the space on the jacket remains empty, which is called Read / Write slot. There is a Write protected notch to prevent writing to the floppy. The data cannot be written on the floppy when it is closed, the floppy is of the following type

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Capacity  1.2MB Size 5 Inch 32 Inch

1.44 MB.


There are four types of floppy based on the ability to store data.

( 1 ) Single Sided Single Density ( SSSD)

(2) Single Sided Double Density (SSDD)

(3) Double Sided Single Density (DSSD) (4) Double Sided Double Density (DSDD)

Floppy is mounted in the floppy drive and the label side is facing up when installed. By pasting a sticker on the floppy, write the information related to the floppy on it which is labeled as

it is said. (b) Hard Disk Hard disk has more than one metal disk. Which is called disk pack. Data cannot be written on the top and bottom part of this disk pack, there is a group of heads to read and write data from all other surfaces.

Hard disk average access time=Seek time + Latency time

Seek time is the time in which the head comes over the respective track. Latency time is the time in which the head waits for the respective sector to come down on its own.

Floppy and hard disk have direct access.

🙂 Magnetic Tape- It consists of plastic tape on both the surfaces of which ferric oxide is applied.

coating takes place. Magnetic tape has sequential access. – Optical Memory- This is a plastic disk. On which there is a silver coating. Optics/Laser (rays of light) are used to write and read data on it. There is also direct access in optical memory. Examples of optical memory are

1-CDROM (Compact Disk Read Only Memory )

2-CDRW (Compact Disk Rewritable)

3-DVD (Digital Versatile/Video Disk)

optical memory

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700 MB

bar can be written.

Worm(Write Once Read Many) disk is also called after erasing the information written on the disk and writing it again.



700 MB

May go. Also called 4.5 MB digital video disk. For the distribution of this film

it occurs.

3- Flash Memory- Semiconductor chip R information can be done permanently is called Flash Memory. For example- Pen drive and Me card (SD card)


Floppy 5% inch

Floppy 315 inch

, Hard Disk

Magnetic Tape

Software (s/w)

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