AutoCAD 2020 23.1 Free 2022 [New]
From the very beginning of AutoCAD, its developers were committed to open architecture. They would release the source code, so anyone can review and improve the software, and would not charge a licensing fee for the product. These features were intended to give users the ability to learn how to use AutoCAD, and help fix any mistakes and bugs in the software. Because of this open architecture and transparency, AutoCAD has become a very successful product, used by engineers, architects, designers, and drafters worldwide.
In the following article, we will review the basic architecture of AutoCAD, its drawing conventions, file types, command line functionality, and the operation of a typical AutoCAD drawing session.
The Basic Architecture of AutoCAD
Like any other graphics application, AutoCAD consists of four layers, from the bottom to the top: user interface, drawing, commands, and post-processing.
The user interface, which is often referred to as the front end, is the place where users enter commands and data, or even create new drawings. There are two types of user interfaces: a command-driven and a point-and-click. The command-driven interface is based on keyboard commands or mouse clicks, and the point-and-click interface provides a menu system for selecting commands or placing points.
The drawing is the result of the commands and data entered by users. It is created in a single file called a drawing, in the form of a list of layers, objects, text styles, and annotations.
The commands are the functions provided by the application to manipulate the drawing. For example, an AutoCAD command will change the placement of objects or change the properties of a single object.
The post-processing is the place where a drawing is output to the screen or saved to a file. It consists of many modules, which may be used to output multiple objects to different media (screen, printer, print driver, PDF file, etc.) or save multiple versions of the drawing (different layers, colors, etc.) to multiple file formats (DWG, DXF, PDF, etc.).
The diagram above is a typical architecture of AutoCAD. The input layers are created by users and saved in the post-processing module, which then outputs the output layers to the appropriate output media.
Before getting into the details of AutoCAD, let's look at some of its common drawing conventions:
Layer
AutoCAD 2020 23.1
Mainstream platforms 
Most of AutoCAD, especially under the Premier edition or under the Architectural edition, is based on Microsoft Windows (including Mac OS X and Linux) although AutoCAD for Linux, the only direct Linux version of AutoCAD available for download from Autodesk, runs on an equivalent software emulator.
AutoCAD was also ported to many other platforms including:
 AmigaOS
 Android
 Archos
 ARM – OS
 Coherent
 EFI/Coherent
 Linux
 macOS
 Microsoft Windows
 MorphOS
 Palm OS
 Pi
 QNX Neutrino – OS
 RISC OS
 SHRIMP (Windows)
 SGI IRIX
 Symbian
 iOS
 PlayStation Portable – OS
 Psion Series 5
 PlayStation 3 – OS
 PlayStation 4 – OS
AutoCAD does not support the Sybase SQL Anywhere or Sybase SQL Anywhere 11g platforms. As of 2017, Autodesk is working to port AutoCAD to ARM processors.
AutoCAD for mobile and tablet PCs 
AutoCAD was originally designed with desktop computers in mind and has been used in this way since its creation in 1987. 
In 2003, Autodesk released AutoCAD Mobile Edition, a version of AutoCAD for mobile and tablet PCs.
Since 2005, versions of AutoCAD have been available for Windows Mobile and later Windows Mobile versions (starting with Windows CE), Windows Phone, and Android devices. These versions have reduced functionality compared to their desktop counterparts.
In 2008, Autodesk released AutoCAD Go, a version of AutoCAD optimized for web and mobile, with much more limited functionality compared to their desktop counterparts.
In 2012, Autodesk released AutoCAD LT Mobile Edition, a version of AutoCAD LT for mobile and tablet PCs, as well as an alternative to AutoCAD Mobile Edition.
In 2019, Autodesk released AutoCAD Studio for iOS and Android.
The architectural edition of AutoCAD for iOS and Android is known as AutoCAD Mobile.
AutoCAD for the Apple Watch was released in October 2017.
See also 
 Comparison of CAD editors for CADDiction
 List of computer-aided design editors for a list of other CAD editors
 List of 3D CAD programs for similar CAD editors
 List of vector graphics editors
References
External links
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