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  2. CAD standards - Wikipedia

    en.wikipedia.org/wiki/CAD_standards

    In AutoCAD usually parts to be printed in black are drawn in 1 to 7 basic colors. Color layer: Green-Center, Magenta-Measure of length, and Blue-Hidden. Color layer: Green-Center, Magenta-Measure of length, and Blue-Hidden.

  3. Aperture card - Wikipedia

    en.wikipedia.org/wiki/Aperture_card

    Such a card is used for archiving or for making multiple inexpensive copies of a document for ease of distribution. The card is typically punched with machine-readable metadata associated with the microfilm image, and printed across the top of the card for visual identification; it may also be punched by hand in the form of an edge-notched card ...

  4. AutoCAD - Wikipedia

    en.wikipedia.org/wiki/AutoCAD

    A man using AutoCAD 2.6 to digitize a drawing of a school building. AutoCAD was derived from a program that began in 1977, and then released in 1979 [5] called Interact CAD, [6] [7] [8] also referred to in early Autodesk documents as MicroCAD, which was written prior to Autodesk's (then Marinchip Software Partners) formation by Autodesk cofounder Michael Riddle.

  5. Punched card input/output - Wikipedia

    en.wikipedia.org/wiki/Punched_card_input/output

    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. A computer card punch is a computer output device that punches holes in cards. Sometimes computer punch card readers were combined with computer card punches and ...

  6. Computer programming in the punched card era - Wikipedia

    en.wikipedia.org/wiki/Computer_programming_in...

    A single program deck, with individual subroutines marked. The markings show the effects of editing, as cards are replaced or reordered. Many early programming languages, including FORTRAN, COBOL and the various IBM assembler languages, used only the first 72 columns of a card – a tradition that traces back to the IBM 711 card reader used on the IBM 704/709/7090/7094 series (especially the ...

  7. .dwg - Wikipedia

    en.wikipedia.org/wiki/.dwg

    DWG (from drawing) is a proprietary [3] binary file format used for storing two- and three- dimensional design data and metadata.It is the native format for several CAD packages including DraftSight, AutoCAD, ZWCAD, IntelliCAD (and its variants), Caddie and Open Design Alliance compliant applications.

  8. Signed overpunch - Wikipedia

    en.wikipedia.org/wiki/Signed_overpunch

    The top three rows of the card are called zone punches, [3] and so numeric character data which may contain overpunches is called zoned decimal. In IBM terminology, the low-order four bits of a byte in storage are called the digit , and the high-order four bits are the zone . [ 4 ]

  9. LibreCAD - Wikipedia

    en.wikipedia.org/wiki/LibreCAD

    LibreCAD is a computer-aided design (CAD) application for 2D design. It is free and open-source, and available for Unix/Linux, macOS, and Windows operating systems.. Most of the interface and handle concepts are analogous to AutoCAD, making it easier to use for users with experience in this type of commercial CAD application.