Non-Impact Printers

 Non-Impact Printers

Non-impact printers address the drawbacks of impact printers. they're quiet, fast and produce documents of very high resolution. the 2 types that are most ordinarily used are laser printers and inkjet printers. The third type not discussed here is that the printer which uses heat to print text and pictures on heat-sensitive paper.

Laser Printer 

A electrostatic printer works somewhat sort of a photocopier. A light beam creates a picture of the page to be printed on a light-sensitive drum. The image, which is formed within the type of dots, is then transferred from the drum to the paper by actual contact.  Color laser printers use colored toner.

Laser printers have built-in RAM for storing documents. This RAM acts as a buffer which might unlock the pc after employment has been submitted for printing. A electrostatic printer also contains a ROM to store fonts. This technology is suitable for printing text and graphics in top quality.  Speeds of 20 ppm (pages per minute) are typical,while the fastest printers operate at 200 ppm. Originally used for publishing, falling prices have made the electrostatic printer available everywhere.

Ink-jet Printer

The dot printer is an inexpensive non-impact printer whose print quality considerably outperforms a dot-matrix printer but under performs a electrostatic printer. during this system, a printhead sprays tiny drops of ink at air mass because it moves along the paper. The ink, stored during a replaceable cartridge, passes through a matrix comprising variety of small nozzles. Like with the pins of a dot-matrix printer, characters are formed by choosing the nozzles that should be activated. Color ink-jet printers either have separate cartridges for every color or use a multi-chambered cartridge.

Inkjet printers typically have a resolution of 300 dpi, but their speed is low-around 1 to six pages per minute. they're thus not suitable for high-volume printing where laser printers offer a stronger option. Better print quality will be obtained by using high-quality acid-free paper which will retain the standard even after years of storage.


 It uses one or more automated pens to complete each line before absorbing the subsequent one.  looking on the sort of plotter, either the plotter pen moves or the paper moves or both.  they're also slow and expensive, the explanation why wide-format printers are increasingly replacing them.

Note: Programs also take input from and write output to the disk. For convenience and to avoid conflict in definition, we do not consider the disk as an input/output device. We use the term

Auxiliary storage

Auxiliary storage, or external storage, is employed for both input and output. it's the place where the programs and data are stored permanently. after you close up the pc, your programs and data remain within the auxiliary storage ready for the following time you wish them.

 Binary Numbering System

A binary number uses only two varieties of digits, 0 and 1.  Although binary numbers are suitable for computers, they're not suitable for general use because they run out of bits quickly. this is often revealed by a glance at the primary eight integers in their binary and decimal forms:

Note that one bit can represent up to the decimal #1. Two bits extend this figure to three (11),while 3 bits can represent up to 7 (111). the most number which will be represented with 8 bits is 2 -1 = 255, which needs only 3 digits in decimal. In general, the most number that may be represented with n bits is 2" - 1. 

How to convert from Binary to Decimal

How do i compute the decimal value of a binary number? Simply multiply each digit by its assigned weight and so sum the weighted values. to determine how this is often actually done, split the binary number 10101 into its constituent bits and align them with their weights and weighted values:

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