Module Flashcards
Those peripheral devices which supply information i.e. data and program from the outside world to the computer are the….
input devices
Those peripheral devices which
give information from the computer to the user or store them in secondary storage devices, like floppy disks or tapes for future use are called…
output devices
The processors which are required to convert the input data into the machinereadable form and to convert the output generated by the computer into human-readable form are known as..
input/output (I/O) interfaces
Here data is directly transferred to the computer
Online Data Input
Here the data is not immediately transferred to the computer.
Off-line Data Input
The pattern of these holes is interpreted by a card reader device and converted into a machine-readable form.
Punch Card
It is used to transcribe the data onto the card.
punch card machine
One of the most commonly used input devices. It has keys made up of letters, numbers, symbols, and special function keys.
Keyboard
It is used to display the data entered by
the operator with the keyboard.
monitor (Cathode Ray Tube)
A special symbol, called a ______, indicates the position on the screen.
Cursor
It is a pointing device and it is used to control and manipulate cursor movement on the monitor
Mouse
contains a photocell placed in a small tube. This photocell detects the presence of light on the CRT (monitor). The tip of the pen is moved on the surface of the screen to write or sketch data
Light pen
It is mainly used in video game applications
Joy Sticks
It uses a hard-sphere to control cursor movement. The bail can be rotated in
any direction by hand and this is translated into a digital signal to control the cursor movement on the screen.
Trackball
Input is registered when a finger or any other object comes in contact with the plate.
Touch Screen
There are two types of touch panels/screen
• Optical touch panels
• Electric touch panels
It converts graphical or pictorial data into digital form which can be directly entered and stored on a computer. It is also called a graphics tablet.
Digitizer
2 types of Digitizer
Image scan digitizer and flatbed digitizer
A type of digitizer that the entire image is scanned and reproduced automatically.
Image scan digitizer
These are mainly used in simple drawings, graphs, etc. whereas image scan digitizers are used for photographs and pictures.
Flatbed digitizers
It can directly enter text and images into the computer memory. Therefore, the duplication work of entering data is eliminated and this also results in increased accuracy. The speed of data entry also increases.
Scanner
2 types of scanners
- Optical Scanners
- Magnetic Ink Character Recognition devices
It uses a light source and sensor for reading the information on the paper. It can read characters, pictures, graphics from the paper.
optical scanner
Two common types of optical scanners
- Optical Mark Reader (OMR)
- Optical Character Reader (OCR)
This is capable of reading pre-specified marks made by pencils or pens with the help of light. Light is focused on the page that is to be scanned. The reflected light pattern is detected by the device.
Optical Mark Reader
It can read alphabets, characters, and numbers printed on paper.
Optical Character Reader
Data that is coded in the form of light or dark lines is a…
bar code.
A special type of input device, this mainly finds application in banking areas.
Magnetic Ink Character Recognition (MICR)
This system allows the user to talk with the computer.
Voice Recognition System
It allows the compute to communicate with the outside world by accepting data from the computer and transforming it into a user-readable form.
output device
It produces the output from the computer on the paper.
Printer
Printer can be classified as…
Impact and non-impact printer
They use a hammer to strike a character against an inked ribbon and the impact of the hammer causes the image of the character to be printed
on paper.
Impact Printer
A type of impact printer that prints each character as a pattern of dots.
Dot Matrix Printer
These printers are also called as letter-quality printers. These printers have a daisy wheel with several petals. A character is embossed on each wheel. There is a motor that spins the wheel at a fast rate. When the desired character is brought to the correct position, a hammer strikes the petal to produce the output.
Daisy Wheel Printer
These are very fast printers that print at speed of 200-2500 lines per minute. These printers are impact printers and normally have 132 print positions per line.
Line printers
2 types of Line Printer
Drum and Chain Printer
They use thermal, chemical, electrostatic, and inkjet technologies for printing as against the hammer mechanism of impact printers. E.g. Laser printers, DeskJet printers.
Non-impact printers
It is a non-impact printer. It prints characters by spraying ink from tiny
nozzles onto the paper.
Inkjet Printer
These printers are used where a very superior quality output is desired. The image is created on a photosensitive drum; with a laser beam.
Laser Printer
It is an output device used in applications where printouts of graphs and drawings are required.
plotter
An electron beam is moved across a phosphor-coated screen to produce the image. It can be monochrome or colored. This screen normally has 25 lines and 80
characters.
Cathode Ray Tube (CRT) Monitor
The most common flat panel display is the….
Liquid Crystal Display (LCD).
The most popular output device indirect access processing is the…
Video Display Terminal.
The monitor and the keyboard together are called a.. .
terminal
Types of Terminal
Dumb, Smart, and Intelligent Terminal
This is a combination of a keyboard and monitor which can send or receive data but
cannot process the data.
Dumb Terminal.
It has an inbuilt microprocessor. It can perform arithmetic, logic, and control functions. They also have some memory capacity. So they can store the data before sending it to the processor. They can also control the cursor movement.
Smart Terminal
This type of terminal also has an inbuilt microprocessor which can be programmed by the user. These terminals also have limited processing capability. They can communicate with other terminals and processors.
Intelligent Terminal
This technology is used to record the computer output as microscopic filmed images.
Computer Output Microfilm
