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History of AutoCAD
The first AutoCAD released was version 1.0. This initial release was a Windows app written in BASIC for DOS. When the Intel 80286 came out in 1986, AutoCAD was rewritten in assembly language (286 asm) for DOS/MS-DOS.
This initial version was very slow, and AutoCAD quickly grew in popularity and was chosen as "Program of the Year" in 1987 by the magazine PC Reports. AutoCAD began shipping on floppy disks, and the first version to support double-sided printing was released. The first version for PC, WinCAD 1.0, was released in 1987 and based on the IBM PC DOS 2.11.
In 1989, a new version, AutoCAD 2.0, was released. Its first major change was to remove the DOS/MS-DOS interface and use the "CUI" interface. At this time, AutoCAD 2.0 also added the ability to create 2D drawings of objects on a 3D model.
In 1990, AutoCAD 2.5 was released. This first version to support 32-bit applications. The price of AutoCAD jumped from $6,000 to $7,000. Also, the workgroup feature was introduced. Workgroups allow several users to simultaneously work on the same drawing. This is especially useful for creating complex drawings. A new program named DWGit was developed that allows a user to create DWG files from other file types.
A new version was released in 1991, AutoCAD 2.6, that added 4D modeling and textured objects. AutoCAD 2.6 is considered by many to be the best release of AutoCAD. With AutoCAD 2.6, users can create unlimited number of dimensions, tag and measure, and automatically correct shape problems.
In 1992, AutoCAD 3.0 was released. This version added shape and surface editing features. This was the first AutoCAD to support Windows NT and Windows 95. With the release of AutoCAD 3.0, users can create multilayer drawings. Also, 4D is supported with AutoCAD 3.0.
In 1993, the world-leading application was released, AutoCAD 4.0. This version added tools for 2D graphics (such as linetypes and special symbols) and a 2D database. AutoCAD 4.0 also added a
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Read/Write API (R/W API)
 This was an interface that was made available for all of Autodesk's products to provide a method of reading and writing with AutoCAD from a C++ or other programming language. R/W API was a published standard document from Autodesk (available at the top of the Autodesk website) that describes an interface that enables AutoCAD data to be collected and stored to an XML format to be readable in other applications and to be read from other applications. Autodesk Exchange Apps is Autodesk Exchange Apps is an application distribution service to Autodesk products that is offered by Autodesk. Autodesk Exchange Apps ( provides Autodesk software developers and publishers the tools to distribute their applications to the Autodesk Exchange Apps. Autodesk Exchange Apps is an application distribution service to Autodesk products that is offered by Autodesk. Autodesk Exchange Apps ( provides Autodesk software developers and publishers the tools to distribute their applications to the Autodesk Exchange Apps. Many users of Autodesk products (including AutoCAD) have found that it's difficult to find a copy of their.DWG files or a program that can read/write the.DWG format. Autodesk released the R/W API as a standard for developers to adopt.
 Autodesk Exchange Apps API
 R/W API standard
 DXF format standard
 Many users of Autodesk products (including AutoCAD) have found it difficult to find a copy of their.DWG files or a program that can read/write the.DWG format. Autodesk released the R/W API standard and a toolset that allows development of applications that interact with the R/W API. This allows developers to write a simple program that can download DWG files from a website, read or write DWG files or create graphical objects and then write the results of a drawing to a file.
See also 
 Comparison of CAD editors for computer-aided design
 Comparison of CAD editors
 List of CAD editors
 List of CAD software
References
External links 
Autodesk
Category:Computer-aided design software
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