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Pre-AutoCAD History
AutoCAD was originally called MicroCAD, an acronym for Microcomputer-aided Design. It was developed by the late 1980s in the Digital Equipment Corporation (DEC) Computer Group Research Labs, under the leadership of physicist Daniel Simula. The MicroCAD development team was headed by Eugene "Pete" Couwenberg, a mathematician and noted software expert. These scientists initially used a 1979 Apple IIc computer to develop MicroCAD.
MicroCAD and later AutoCAD, were developed under Simula's "CADMAR" project, which was to design a CAD system that would be suitable for CAD operators to use in small, home-oriented workgroups. MicroCAD and other early products by Simula's team were developed using object-oriented design.
History
Simula and Couwenberg were hired by the research labs of the newly formed Autodesk Inc., a company formed in 1982 by John Warnock, who was a leader in the creation of the popular Macintosh computer. Autodesk founders, John Warnock and Ed Simula, both felt that a microcomputer CAD system would be ideal for workgroups at home or in small offices. Ed Simula explained the origins of the AutoCAD name:
"We had this definition about 'AutoCAD', and we really thought about it. We were doing this for engineers and architects, and all of us were engineers. Some of us were architects, and we wanted to be sure that we were on the same side of things. We wanted the computer to help us design. We didn't want it to dictate what we should be doing. So we were trying to explain what we wanted the system to be. We had a simple name, and that name was AutoCAD. We liked that name so much, and it was a great name to describe what we were doing".
Simula and Couwenberg were working on a project called "CADMAR" (Computer-Aided Design with Multidisciplinary Applications), which was intended to be a complete CAD system designed for engineers and architects. MicroCAD was one of the first projects under the CADMAR project. By the late 1980s, the CADMAR project had become part of Autodesk.
CADMAR's History
CADMAR: A Research Lab Developed CAD System
CADMAR was developed to be a CAD system suitable for small home
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Windows API calls in AutoCAD can use external routines, but also they can use Autodesk's platform-independent C++ call mechanisms, which can run in both Windows and OS X.
 The API structure and functions are similar for both AutoCAD and AutoCAD LT.
, AutoCAD features 2.5 million lines of code and is written in over 100 programming languages, covering over 70% of AutoCAD's code, making it the largest single software application written in a programming language.
History 
AutoCAD was originally developed in the 1980s at Computer Associates (now Autodesk). During the early years of its development, AutoCAD was owned by Computer Associates (which later became Autodesk) and the name of the product was CAD. When Autodesk purchased a stake in Micrografx, the next version was released as an AutoCAD and Micrografx package. In 1994, the name was changed to AutoCAD to reflect the expansion to other fields of design (architecture, electrical and civil, mechanical, etc.).
AutoCAD, and all the major AutoCAD add-ons, were first written in AutoLISP. This is a derivative of the LISP programming language, but significantly modified to include a graphical user interface (GUI). When CAD was first released, it was known as 'CAD'.
By the end of the 1990s, the object-oriented programming language ObjectARX was being developed for AutoCAD. This was replaced in version 14.5, released in March, 2013, by C++/CLI.
In March 2010, Autodesk announced that version 16 would be the last major release of AutoCAD to support the Windows XP operating system. Support for Windows XP ended on April 8, 2014.
Components 
AutoCAD has many components that are added to it depending on a customer's needs. The program can be created as a single large application, or as multiple smaller pieces that are called "packages."
The smallest packages of AutoCAD are the add-ons: companies that sell a package that extends the functionality of AutoCAD. These are usually offered as a monthly subscription on Autodesk Exchange Apps. The most popular are AutoCAD Architecture, AutoCAD Civil 3D, AutoCAD Electrical and AutoCAD MEP. Some are free while others are paid.
The main components are:
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