FreeDOS 1.1 has been released after being in development for several years. FreeDOS is an opensource operating system aiming to provide the same (or better) functionality as Microsoft'sold MS-DOS. Right now the main use is running old games and software, but you might encounter it on somefreshly sold computers, motherboard setup CDs, BIOS flashing diskettes, embedded hardware and other uses.

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http://www.freedos.org/freedos/files/