Dot Matrix Printing

Dot Matrix Printing

Dot matrix printing or impact matrix printing  is a type of computer printing which uses a print head that moves back-and-forth, or in an up-and-down motion, on the page and prints by impact, striking an ink-soaked cloth ribbon against the paper, much like the print mechanism on a typewriter.

A type of printer that produces characters and illustrations by striking pins against an ink ribbon to print closely spaced dots in the appropriate shape. Dot-matrix printers are relatively expensive and do not produce high-quality output. However, they can print to multi-page forms (that is, carbon copies), something laser and ink-jet printers cannot do.





Dot-matrix printers vary in two important characteristics:

>> speed: Given in characters per second (cps),the speed can vary from about 50 to over 500 cps. Most dot-matrix printers offer different speeds depending on the quality of print desired.




>> print quality: Determined by the number of pins (the mechanisms that print the dots), it can vary from 9 to 24. The best dot-matrix printers (24 pins) can produce near letter-quality type, although you can still see a difference if you look closely.

Ransomware Virus NEW VIRUS

About | Ransomware

What is ransomware?Malicious software that locks a device, such as a computer, tablet or smartphone and then demands a ransom to unlock it

Where did ransomware originate?The first documented case appeared in 2005 in the United States, but quickly spread around the world

How does it affect a computer?The software is normally contained within an attachment to an email that masquerades as something innocent. Once opened it encrypts the hard drive, making it impossible to access or retrieve anything stored on there – such as photographs, documents or music

How can you protect yourself?Anti-virus software can protect your machine, although cybercriminals are constantly working on new ways to override such protection

How much are victims expected to pay?The ransom demanded varies. Victims of a 2014 attack in the UK were charged £500. However, there’s no guarantee that paying will get your data back