DOS Box

DOSBox
DOSBox emulates an Intel x86 PC, complete with sound, graphics, mouse, (modem)?, etc., necessary for running many old DOS games that simply cannot be run on modern PCs and operating systems, such as Microsoft Windows 2000, Windows XP, Linux and FreeBSD. However, it is not restricted to running only games. In theory, any DOS application should run in DOSBox, but the emphasis has been on getting DOS games to run smoothly, which means that communication, networking and printer support are still in early developement.

FreeDOS
The goal of the FreeDOS Project is to create a free implementation of MS-DOS. DOS is a popular system, and there is plenty of hardware out there that supports DOS. The FreeDOS Project was founded in 1994 by Jim Hall.