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Electrostatic plotters were made in both flat-bed and drum types. The electrostatic plotter uses the pixel as a drawing means, like a raster graphics display device. The plotter head consists of a large number of tiny styluses (as many as 21760) embedded in it. This head traverses over the width of the paper as it rolls past the head to make a ...
The pen was pressed by a spring against paper scrolling across the drum. A solenoid could lift the pen off the paper. This arrangement allowed line drawings to be made under computer control. Later, Calcomp manufactured its model 563, which was very similar but had a 30-inch (760 mm) wide drum. The paper rolls were 120 feet (37 m) long.
The IBM 1627 was a rebranded Calcomp plotter sold by IBM for use with the IBM 1620, and, later, the IBM 1130 computers. It became perhaps the first non-IBM peripheral that IBM allowed to be attached to one of its computers. The plotter fed a roll of paper with perforated edges over a drum with matching sprockets at the sides.
The ink ribbon is a long roll the width of the print area positioned between the print chain and the paper. The roll comes in two parts: the feeder roll and take-up roll. The roll is constantly wound and rewound during printing. An IBM 1403, foreground, part of an IBM 7030 Harvest installation at the U.S. National Security Agency
The Atari 1020 is a four-color computer plotter which was sold by Atari, Inc. for Atari 8-bit computers. The 1020 is capable of 20-, 40- and 80-column text [1] and graphics using a friction-fed roll of paper approximately 11.5 cm (4.5 inches) in width.
Circular chart recorders have a rotating disc of paper that must be replaced more often, but are more compact and amenable to being enclosed behind glass. Roll chart recorders are similar to strip chart recorders except that the recorded data is stored on a round roll, and the unit is usually fully enclosed.
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