A printer in which each character is formed from a matrix of dots. They are normally impact systems, ie a wire is fired at a ribbon in order to leave an inked dot on the page, but thermal and electro-erosion systems are also used. Found on http://www.encyclo.co.uk/local/20829
A printer that uses a set of needles to impact on an ink ribbon. Each character requires a unique pattern of needles. Primarily used in business in order to make instant copies of printouts, e.g. invoices.
Found on http://www.encyclo.co.uk/visitor-contributions.php
Computer printer that produces each character individually by printing a pattern, or matrix, of very small dots. The printing head consists of a vertical line or block of either 9 or 24 printing pins. As the printing head is moved from side to side across the paper, the pins are pushed forwards selec... Found on https://www.encyclo.co.uk/local/21221