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Printers
Printers are the most commonly used output devices. they are used to produce the hard-copy of the output. the output printed on the paper is called hardcopy . the output may be in the form of characters, symbols and graphics(i.e.drawing or charts).
A printer is connected to a parallel port of system unit by a cable. the parallel port is also called LPT1 (LPT1 is short for line printer 1).
Different types of printers are available. the main difference between printers depends upon printing quality and printing speed.
Types of printer
the main types of printers are follows:
1- Character printer 2- Line printer
3- Page printer
1- Character printer:
The printers that make hardcopy by printing one character at a time are called character printers. A typewriter is an example of character printer. A character printer can print about 30 to 300 characters per scond (cps).
the advantage of character printer is that it is less expensive. However, there are many disadvantages of character printers. the main disadvantages are :
they are slower in printing.
they produce low quality output.
they produce more noise during printing.
in the past, character printers were very popular. they were commonly used with personal computers to print the information on paper. Today they are rarely used. they examples of character printers are dot matrix printer and daisy wheel printer.
2- Line Printers
The types of printers that print a complete line of characters at a time are called line printers. they are faster than character printers. the printing speed of line printer is measured in line per minute (lpm). it is about 200 lines per minutes. line printer are normally used with mainframe and mini computers. the examples of line printers are ; chain printers and drum printers.
3- Page printer
The types of printers that print a complete page of output at a time are called page printers. Normally, printing speed of a page printer is about 4 to 32 pages per minute. laser printer is an example of pages printer.
Printers are the most commonly used output devices. they are used to produce the hard-copy of the output. the output printed on the paper is called hardcopy . the output may be in the form of characters, symbols and graphics(i.e.drawing or charts).A printer is connected to a parallel port of system unit by a cable. the parallel port is also called LPT1 (LPT1 is short for line printer 1).
Different types of printers are available. the main difference between printers depends upon printing quality and printing speed.
Types of printer
the main types of printers are follows:
1- Character printer 2- Line printer
3- Page printer
1- Character printer:
The printers that make hardcopy by printing one character at a time are called character printers. A typewriter is an example of character printer. A character printer can print about 30 to 300 characters per scond (cps).
the advantage of character printer is that it is less expensive. However, there are many disadvantages of character printers. the main disadvantages are :
they are slower in printing.they produce low quality output.
they produce more noise during printing.
in the past, character printers were very popular. they were commonly used with personal computers to print the information on paper. Today they are rarely used. they examples of character printers are dot matrix printer and daisy wheel printer.
2- Line Printers
The types of printers that print a complete line of characters at a time are called line printers. they are faster than character printers. the printing speed of line printer is measured in line per minute (lpm). it is about 200 lines per minutes. line printer are normally used with mainframe and mini computers. the examples of line printers are ; chain printers and drum printers.
3- Page printer
The types of printers that print a complete page of output at a time are called page printers. Normally, printing speed of a page printer is about 4 to 32 pages per minute. laser printer is an example of pages printer.
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