Most CAD computers are Windows based PCs. Some CAD systems also run on one of the Unix operating systems and with Linux operating systems. Some CAD systems such as QCad, NX or CATIA V5 provide multiplatform support including Windows, Linux, UNIX and Mac OS X. Generally, no special hardware is required with the possible exception of a good graphics card, depending on the CAD software used. However, for complex product design, machines with high-speed CPUs and large amounts of RAM are recommended. CAD was an application that benefited from the installation of a numeric coprocessor especially in early personal computers. The human-machine interface is generally via a computer mouse but can also be via a pen and digitizing graphics tablet. Some systems also support stereoscopic glasses for viewing the 3D model.
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