IO device Flashcards
Monitors
Cathode-Ray Tube (CRT)
Flat- Panel Display
Liquid Crystal Display (LCD) Monitor
Light Emitting Diode (LED) Monitor
more lifelike and accurate
Organic Light Emitting Diode (OLED) Monitor
made up of some organic material
Printers
Impact Printers and Non-impact printers
Impact Printers
he impact printers print the characters by striking them on the ribbon which is then pressed on the paper
Dot-Matrix Printers, Line Printers, Daisy wheel printer, Drum printer, Chain printer, Band printer
Non-Impact Printers
Non-impact printers print the characters on the paper without using ribbon. These printers print a complete page at a time, so they are also called as page printers
Inkjet Printers
Inkjet printers work by spraying ink on a sheet of paper. The type of ink used in an inkjet printer is wet.
Plotters
A plotter is an output device used to produce hard copies of large graphs and designs on paper, such as construction drawings, architectural plans, and business charts
types of plotters.
Drum plotters and Flatbed plotters
Drum plotter
It is a pen plotter that wraps the paper around a drum with a pin feed attachment.
The drum then rotates the paper as pens move across it and draw the image.
It is used to produce continuous output, such as plotting of earthquake activity
It is also known as Roller Plotter.
Flatbed plotter
It plots on paper that is spread and fixed over a rectangular flatbed table.
It is used in the design of cars, ships, aircrafts, buildings, highways etc.
It is also known as Table Plotter.
Dot-Matrix Printers
It prints characters as a combination of dots.
They have a matrix of pins on the print head of the printer which form the character.
They generally have 9-24 pins. Their speed is measured in cps (Character per second).
Impact Printers
Line Printers
A line printer is an impact printer which can print one line of text at a time. It is also known as a bar printer
Impact Printers
Laser Printers
A laser printer is a popular type of personal computer printer that uses a non-impact photocopier technology.
The type of ink used in a laser printer is dry.
It gives high-quality output.
The resolution of laser printers is measured in dpi (dots-per-inch).
Non-Impact Printers
Solid Ink Printer
It is a type of colour printer. It works by melting the solid ink that applies the images to the paper. It is non-toxic and convenient to handle
LED Printer
his type of printer uses a light emitting diode instead of a laser. It starts by creating a line-by-line image of the page.
7 structure of OS
Kernel Memory Management Process Management Device Management File Management Storage Management User Interface
OMR
Optical Mark Recognition
OCR
Optical Character Recognition
It is a technology that recognizes text within a digital image. It converts the document to an editable text file.
Digitizer
It allows users to draw and manipulate graphics on the screen.
It is also known as a graphics tablet.
These kinds of tablets typically designed for CAD/CAM professionals.
MICR
Magnetic Ink Character Recognition
It is a character recognition system that uses special ink and characters. It is used to verify the legitimacy or originality of paper documents, especially cheques. Information can be encoded in the magnetic characters. It provides a secure, high-speed method of scanning and processing information
Modifier Keys
special key (key combination) that temporarily modifies the normal action of another key when pressed together. Shift, Alt, Ctrl, Fn are modifier keys.
Toggle Keys
It is used to change the input mode of a group of keys on a keyboard. Caps Lock, Num Lock, Scroll Lock are toggle keys.
Computer Peripheral
A peripheral device links to a computer system to enhance the functionality of the computer. It is not part of the core computer architecture. Input devices, output devices, and storage devices are the types of peripheral devices.
Data Transmission Modes
Data Transmission modes refer to the way of transferring the information or data between two connected devices. Three types of transmission modes are:
✓ Simplex Mode: Data can be transferred in only one direction, Keyboard
✓ Half Duplex Mode: Data can be transferred in both directions, but not at the same time. Walkie-talkie.
✓ Full Duplex Mode: data can be transferred in both direction on the same transmission path. Two lines are used for sending and receiving the data.
Telephone network
