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  2. ISO 216 - Wikipedia

    en.wikipedia.org/wiki/ISO_216

    All ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same aspect ratio, √ 2:1, within rounding to millimetres. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series ...

  3. Lines per inch - Wikipedia

    en.wikipedia.org/wiki/Lines_per_inch

    Higher-quality paper, such as that used in commercial magazines, has less dot gain, and can range up to 300 LPI with quality glossy (coated) paper. In order to effectively utilize the entire range of available LPI in a halftone system, an image selected for printing generally must have 1.5 to 2 times as many samples per inch (SPI).

  4. Paper size - Wikipedia

    en.wikipedia.org/wiki/Paper_size

    Paper size standards govern the size of sheets of paper used as writing paper, stationery, cards, and for some printed documents. The ISO 216 standard, which includes the commonly used A4 size, is the international standard for paper size.

  5. Plotter - Wikipedia

    en.wikipedia.org/wiki/Plotter

    This program instructs the plotter, in order, to take the first pen (SP1 = Select Pen 1), to go to coordinates X=500, Y=500 on the paper sheet (PA = Plot Absolute), to lower the pen against the paper (PD = Pen Down), to move 1000 units in the Y direction (thus drawing a vertical line - PR = Plot Relative), to lift the pen (PU = Pen Up) and ...

  6. Line printer - Wikipedia

    en.wikipedia.org/wiki/Line_printer

    An IBM 1403 printer opened up as it would be to change paper. Note the form tractors on each side of the paper, and the carriage control tape in upper right. The print chain is covered by a full-width ink ribbon, see lower right: The hinged chain-and-ribbon assembly is here swung open towards the camera like a gate. Green-zebra-paper

  7. Punched card input/output - Wikipedia

    en.wikipedia.org/wiki/Punched_card_input/output

    An IBM 80-column punched card of the type most widely used in the 20th century IBM 1442 card reader/punch for 80 column cards. A computer punched card reader or just computer card reader is a computer input device used to read computer programs in either source or executable form and data from punched cards.

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