The Control Unit: the main function of the control unit is to issue signals to all the hardware and software that are necessary to obey instructions.
Output Unit: The output unit acts like human mouth that interprets the job of the brain, which means the output unit serves as interpreter between computers and its users. It converts information into a form readily understood by it users in either soft-copy or hard-copy. Soft-copy is the information or output on the screen or diskette. Hard-copy is the output on paper which, is produced by the printer. Some examples of output devices are:
- Monitors
- Printers
- Plotters
- Diskettes.
Printers:
printers are the most popular output devices used across the globe. A printer is an output device that processed data or information from the computer and produces the information on paper.
Classification of Printers
- Impact Printers
- Non-Impact Printers
Impact printers: This printer makes noise as it produces characters on paper. This is because impact printers exhibit certain mechanism that causes hammers or pins of the printer in strike against a ribbon to create an inked impression on paper, Some examples of impact printers are: Dot matrix printer, daisy wheel printer, chain printers etc.
Daisy Wheel prints a character at a time. its delay wheel is removable. It was produced after a typewriter,
A Dot matrix. In dot matrix, characters are formed with dots from matrix print wires on the print head. The more the dots, the higher the printer quality.
Chain printers: A chain printer is a line printer, it is not like daisy and dot matrix that are character printers.
A line printer prints a line of text at a time. Other line printers are ribbon printers, Drum printers etc.
Non-Impact Printers
In this category, printers does not involve mechanical impact.
So, in operation, it is noiseless. The common non - impact printers include:-
Inkjet Printers
Laser Printers
Inkjet Printer
This printer sprays ink from an ink cartridge on to the paper as it rolls by. The noise produced as the cartridge rolls by is negligible, it is used for colour, black and white printing. the typical speed ranges from 50 characters per seconds (CPS) to above 300cps
Laser Printer
This type of printers by deflecting of laser beams on to the photo sensitive surface of a drum inside the cartridge and the latent image attracts the ink (Toner) to the image area. The toner is the electron - statically move on to the paper, which shaped into a character. Laser printer has high quality and high speed technology.
the speeds can range from 10 pages per minute to about 200 pages per minute depending on size and model of printers. Other non-impact printers are thermal printers, electrographic printers etc.
A Dot matrix. In dot matrix, characters are formed with dots from matrix print wires on the print head. The more the dots, the higher the printer quality.
Chain printers: A chain printer is a line printer, it is not like daisy and dot matrix that are character printers.
A line printer prints a line of text at a time. Other line printers are ribbon printers, Drum printers etc.
Non-Impact Printers
In this category, printers does not involve mechanical impact.
So, in operation, it is noiseless. The common non - impact printers include:-
Inkjet Printers
Laser Printers
Inkjet Printer
This printer sprays ink from an ink cartridge on to the paper as it rolls by. The noise produced as the cartridge rolls by is negligible, it is used for colour, black and white printing. the typical speed ranges from 50 characters per seconds (CPS) to above 300cps
Laser Printer
This type of printers by deflecting of laser beams on to the photo sensitive surface of a drum inside the cartridge and the latent image attracts the ink (Toner) to the image area. The toner is the electron - statically move on to the paper, which shaped into a character. Laser printer has high quality and high speed technology.
the speeds can range from 10 pages per minute to about 200 pages per minute depending on size and model of printers. Other non-impact printers are thermal printers, electrographic printers etc.