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It would take much longer for color printing in the home to become ubiquitous, with the inkjet printer. Near Letter quality (NLQ) edit main article: near-letter quality text quality was a recurring issue with dot-matrix printers. Near Letter quality mode—informally specified as almost good enough to be used in a business letter 22 —endowed dot-matrix printers with a simulated typewriter-like quality. By using multiple passes of the carriage, and higher dot density, the printer could increase the effective resolution. In 1985, The new York times described the use of " near letter-quality,. L.Q." and " near letter quality " as "just a neat little bit of hype" 3 but acknowledged that they "really show their stuff in the area of fonts, print enhancements and graphics." 24-pin printers edit by the mid-1980s, manufacturers had increased the pincount. The increased pin-count permitted superior print-quality which was necessary for success in Asian markets to print legible cjkv characters. 23 In the pc market, nearly all 9-pin printers printed at a de facto-standard vertical pitch of 9/72 inch (per printhead pass,.

Single-strike ribbons created a risk of espionage and loss of privacy, because the used ribbon reel could be unwound to reveal everything that had been printed. Secure disposal was required safety by shredding, melting, or burning of used ribbon cartridges to prevent recovery of information from garbage bins. Color edit several manufacturers implemented color dot-matrix impact printing through a multi-color ribbon. Color was achieved through a multi-pass composite printing process. During each pass, the print head struck a different section of the ribbon (one primary color). For a 4-color ribbon, each printed line of output required up to 3 passes depending on color. In some color printers, such as the Apple ImageWriter ii and Star Micronics nx-1000C "Rainbow" or the optional color kits for the nec pinwriter series, the printer moved the ribbon vertically relative to the fixed print head assembly. In other models, the print head was tilted against a stationary ribbon. As the color ribbon was used in the printer, the black ink section would gradually contaminate the other 3 colors, changing the consistency of printouts over the life of the ribbon. Hence, the color dot-matrix was suitable for abstract illustrations and pie charts, but not for photo-realistic reproduction. Dot-matrix thermal-transfer printers offered more consistent color quality, but consumed printer film, which was more expensive.

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Lower: Inked and folded, the ribbon is pulled into the cartridge by the roller mechanism to the left Single-strike and Multi-strike ribbons were an attempt to address issues in the ribbon's ink quality. Standard printer ribbons used the same principles as typewriter ribbons. The printer would be at its darkest with a resume newly installed ribbon cartridge, but would gradually grow fainter with each successive printout. The variation in darkness over the ribbon cartridge's lifetime prompted the introduction of alternative ribbon formulations. Single-strike ribbons used a carbon-like substance in typewriter ribbons transfer. As the ribbon was only usable for a single loop (rated in terms of 'character count the blackness was of consistent, outstanding darkness. Multi-strike nylon ribbons gave an increase in ribbon life, at the expense of quality. Single-strike ribbons edit The high quality of single-strike ribbons had two side effects: At least 50 and up.9 of the given ribbon surface would be wasted per character, since an entire fresh new region of ribbon was needed to print even the smallest. Ribbon advance was fixed to always span the largest character shape, so a row of periods would consume as much fresh ribbon as a row of W's, with a large span of unused carbon between each dot.

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The impact pins of the printhead were constrained to a minimum size (for structural durability and dot densities above 100 dpi merely caused beauty adjacent dots to overlap. While the pin diameter placed a lower limit on the smallest reproducible graphic detail, manufacturers were able to use higher dot density to great effect in improving text quality. Several dot-matrix impact printers (such as the Epson fx series) offered 'user-downloadable fonts'. This gave the user the flexibility to print with different typefaces. Pc software uploaded a user-defined fontset into the printer's memory, replacing the built-in typeface with the user's selection. Any subsequent text printout would use the downloaded font, until the printer was powered off or soft-reset. Several third-party programs were developed to allow easier management of this capability. With a supported word-processor program (such as WordPerfect.1 the user could embed up to 2 nlq custom typefaces in addition to the printer's built-in (ROM) typefaces. (The later rise of wysiwyg software philosophy rendered downloaded fonts obsolete.) Upper: Inmac ink ribbon cartridge with black ink for Dot matrix printer.

Yet the dot-matrix print head was well-suited to this task, and the capability, referred to as "dot-addressable" quickly became a standard feature on all dot-matrix printers intended for the personal and home computer markets. In 1981, Epson offered a retrofit eprom kit called Graftrax to add the capability to many early mx series printers. Banners and signs produced with software that used this ability, such as Broderbund 's Print Shop, became ubiquitous in offices and schools throughout the 1980s. Progressive hardware improvements to impact printers boosted the carriage speed, added more (typeface) font options, increased the dot density (from 60 dpi up to 240 dpi and added color printing. Faster carriage speeds meant faster (and sometimes louder) printing. Additional typefaces allowed the user to vary the text appearance of printouts. Proportional-spaced fonts allowed the printer to imitate the non-uniform character widths of a typesetter. Increased dot density allowed for more detailed, darker printouts.

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This and its successor, the 9-pin mx-80/MP-80 (introduced in 1979/1980 19 sparked the popularity of impact printers in the personal computer market. 20 The mx-80 combined affordability with good-quality text output (for its time). Early impact printers (including the mx) were notoriously looking loud during operation, a result of the hammer-like mechanism in the print head. The mx-80 even inspired the name of a noise rock band. 21 The mx-80's low dot density (60 dpi horizontal, 72 dpi vertical) produced printouts of a distinctive "computerized" quality. When compared to the crisp typewriter quality of a daisy-wheel printer, the dot-matrix printer's legibility appeared especially bad.

In office applications, output quality was a serious issue, as the dot-matrix text's readability would rapidly degrade with each photocopy generation. Ibm sold the mx-pc software edit Initially, third-party software (such as the Bradford printer enhancement program) offered a quick fix to the quality issue. The software utilized a variety of software techniques to increase print quality; general strategies were doublestrike (print each line twice and double-density mode (slow the print head to allow denser and more precise dot placement). Such add-on software was inconvenient, because it required the user to run the enhancement program before each printer session (to activate the enhancement mode). Furthermore, not all enhancement software was compatible with all printers. Early personal computer software focused on the processing of text, but as graphical displays became ubiquitous throughout the personal computer world, users wanted to print both text and images. Ironically, whereas the daisy-wheel printer and pen-plotter struggled to reproduce bitmap images, the first dot-matrix impact printers (including the mx-80) lacked the ability to print graphics.

91 kg wooden crate, unpacked by removal of 36 screws Characters: 62, 10 numeric, 26 upper case and 26 special characters (no lower case) Character size: 10 characters per inch Line spacing: 6 lines per inch Vertical control: punched tape reader for top of form and. Non-impact is one way in which printers are divided into two classes. 11 Dot-matrix impact printers, "the most common type still sold as of October of 2012 12 use "a vertical column of pins which fire" (and thus force contact between the paper and "an ink-soaked ribbon. Low-cost dot-matrix printers edit In the mid-1980s, dot-matrix printers were dropping in price, 3 13 and, being "faster and more versatile than daisywheel printers" (including becoming even more flexible in what they can do because of 24-pin print heads, versus the earlier 9-pin models) they've. 12 Draft mode edit There are techniques for obtaining what some call "Near Letter quality" (NLQ) output from a dot matrix printer use more pins (typically 24, sometimes 18, compared to 9) 1 print and then slightly shift overprint.


This takes more time. To obtain the maximum output speed, albeit at a lower quality, each character and line is only printed once. This is called "draft mode". In the 1970s and 1980s, dot matrix impact printers were generally considered the best combination of cost and versatility, and until the 1990s were by far the most common form of printer used with personal and home computers. Pc usage edit Also known as "serial dot matrix printers tatement "for the average personal computer user dot matrix remains the most workable choice" 1 was still quite valid over a quarter of a century later. At the time, ibm sold Epson 's mx-80 as their ibm 5152. 15 Another technology, inkjet printing, which uses the razor and blades model (give away the razor handle, make money on the razor blade) 16 has reduced the value of the low cost for the printer: "a price per milliliter on par with liquid gold" for. 17 Personal computers edit In June 1978, the Epson tx-80/TP-80, 18 an 8-pin dot-matrix printer mainly used for the commodore pet computer, was released.

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Most efficient dot matrix printers used this buffering technique. Digital technology later broadened the basic LA36 line into a wide variety of dot matrix printers. LA50 edit The dec la50 good was designed to be a "compact, dot matrix" 7 printer. When in graphic mode will (as opposed to text mode the printhead can generate graphic images. When in ( bitmap ) graphics mode, the la50 can receive and print Sixel 9 graphics format. The wikipedia logo, converted to sixel format Centronics 101 edit The centronics 101 10 (introduced 1970) was highly innovative and affordable at its inception. Some selected specifications: Print speed: 165 characters per second weight: 155 pounds (70.3 kg) size: 27 " W x 11 " H x 19 d (approx. 70 cm x 29 cm x 49 cm) Shipping: 200 pounds (approx.

high quality letter paper

la30 was followed in 1974 by the la36, which achieved far greater commercial success, becoming for a time the standard dot matrix computer terminal. The la36 used the same print head as the la30 but could print on forms of any width up to 132 columns of mixed-case output on standard green bar fanfold paper. The carriage was moved by a much-more-capable servo drive using a dc electric motor and an optical encoder / tachometer. The paper was moved by a stepper motor. The la36 was only available with a serial interface but unlike the earlier LA30, no fill characters were required. This was possible because, while the printer never communicated at faster than 30 characters per second, the mechanism was actually capable of printing at 60 characters per second. During the carriage return period, characters were buffered for subsequent printing at full speed during a catch-up period. The two-tone buzz produced by 60-character-per-second catch-up printing followed by 30-character-per-second ordinary printing was a distinctive feature of the la36, quickly copied by many other manufacturers well into the 1990s.

Digital Equipment Corporation (DEC) was another major vendor, albeit with a focus on use with their pdp minicomputer line. 7, their LA30 30 character/second (CPS) dot matrix printer, the first of many, was introduced in 1970. Dec's dot matrix printers edit, unlike the, lA30 's 80-column, uppercase-only 5x7 dot matrix, dec's product line grew. New models included: LA36 (1974 supported upper and lower case, with up to 132 columns of text (also 30 cps). LA34: a lower-cost alternative to the la36. LA38: an LA34 with more features LA180: 180 cps ls120: 120 cps la120: 180 cps (and some advanced features) LA12: a portable terminal LA30 edit The decwriter LA30 was a 30 character per second pdf dot matrix printing terminal introduced in 1970 by digital Equipment Corporation. The printhead was driven by a stepper motor and the paper was advanced by a noisy solenoid ratchet drive.

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An, epson mx-80, a classic model that remained in use for many years. Ibm sold it as their ibm 5152. 1, a dot matrix printer is an impact printer that prints using a fixed number of pins or wires. 2 3, in contrast, inkjet and laser printers technically exhibit dot matrix printing, but they are not considered "dot matrix printers". Contents, technology overview edit, the first impact dot matrix printer was the. 4 5, introduced in 1970, paper 6 it led to the design of the parallel electrical interface that was to become standard on most printers until it was displaced well over a decade later by the. Universal Serial Bus usb ).


high quality letter paper
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