DOSBox

DOSBox is an emulator which creates a DOS-like environment primarily intended for running older, MS-DOS-based PC computer games which may not run properly on newer PCs. DOSBox is open source and available for many operating systems, such as Linux, MS Windows, Mac OS X and BeOS.

Features:

Since DOSBox is a full emulator, not just a compatibility layer like dosemu or the DOS prompt of Windows, it requires neither an x86 CPU nor a copy of MS-DOS or any other DOS to run, and it can run games that require the CPU to be in real mode or protected mode.
Graphics emulation: Text mode, Hercules, CGA, EGA, VGA, VESA and Targa.
Sound emulation: Adlib, PC speaker, Tandy, Sound Blaster, CMS, Disney and Gravis Ultrasound.
Network emulation: Modem simulation over TCP/IP, allowing for DOS modem games to be played over the internet. IPX network tunneling, which allows for old IPX Dos multiplayer games to be played over the internet. Finally, Win32 builds support direct serial port access.

External link