A dot matrix is a 2-dimensional patterned array, used to represent characters, symbols and images.
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In 1970, Centronics (then of Hudson, New Hampshire) introduced a dot matrix printer, the Centronics 101.
(Demand for accented vowels led to the 8-bit ISO 8859-1. Demand for Cyrillic, Hebrew, Arabic, Greek, and other letters led to many variations of ISO 8859. Demand for using more than one of these sets of letters at the same time led to the 16 bit Unicode. Demand for Chinese characters led to 20-bit Unicode, which clearly is impossible for any typewriter like formed character mechanical teleprinter, although dot-matrix printers can print Chinese characters.)
Screen: The display was a 24-line, 80-character (7×10 dot matrix) white-on-black monochrome CRT, with software-selectable variations such as reverse video, blinking, low-intensity (equivalent to grey text), and 4×4-resolution graphics.