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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.

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.
Running DOS on the Raspberry Pi

Differing CPU architectures mean running DOS on Raspberry Pi isn't effortless, but it's not very complicated, either.
How to run DOS programs in Linux

QEMU and FreeDOS make it easy to run old DOS programs under Linux.
old computer

Or, why a community formed around an open source version of DOS, and how it's still being used today.
4 cool facts you should know about FreeDOS

23 years later, FreeDOS is in active development and edges out MS-DOS's lifespan by a few years.
How to upgrade your system BIOS using FreeDOS

Upgrading your BIOS can seem tricky for free software users, but it doesn't have to be.
How I got started with Linux

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