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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.

Files in a folder

Learn how to create, edit, and name files in FreeDOS.
A map with a route highlighted

Master the DIR command to navigate your way around FreeDOS.
Looking at a map for career journey

Learn about your FreeDOS path, how to set it, and how to use it.
FreeDOS fish logo and command prompt on computer

Use this FreeDOS cheat sheet to help you remember how to use the most common FreeDOS commands.
FreeDOS fish logo and command prompt on computer

Learn to navigate the C:\> prompt like an early 1990s DOS boss.
A FreeDOS game image

Differing CPU architectures mean running DOS on Raspberry Pi isn't effortless, but it's not very complicated, either.
Code going into a computer.

QEMU and FreeDOS make it easy to run old DOS programs under Linux.
Person typing on a 1980's computer

Or, why a community formed around an open source version of DOS, and how it's still being used today.