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FreeDOS is an open source operating system which is compatible with MS-DOS and applications designed for this older operating environment. If you've got a legacy application that you want to keep running, whether it's a classic game, an embedded system, or simply an old application, FreeDOS can help you do it.

Learn how to get started or download this handy cheat sheet for FreeDOS.

A FreeDOS game image

23 years later, FreeDOS is in active development and edges out MS-DOS's lifespan by a few years.
Terminal window with green text

Upgrading your BIOS can seem tricky for free software users, but it doesn't have to be.
5 pengiuns floating on iceburg

From physics student to the founder of FreeDOS, Jim Hall tells us how it all started with a hobby Linux install in 1993.
4 different color terminal windows with code

Learn all about FreeDOS, the open source Disk Operating System, and where the project is headed in...