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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.

Code going into a computer.

An overview of how your computer boots up and starts a simple operating system like FreeDOS.
Tips and gears turning

Here's a helpful guide to batch files under FreeDOS.
Looking at a map for career journey

Environment variables are helpful in almost every command-line environment, including FreeDOS.
FreeDOS fish logo and command prompt on computer

If you're already familiar with the Linux command line, try these commands to help ease into FreeDOS.
4 different color terminal windows with code

Armed with just two commands DIR and CD, you can navigate your FreeDOS system from the command line.
Old UNIX computer

It looks like retro computing, but it's a modern OS you can use to get stuff done.
Computer screen with files or windows open

Batch files are a great way to write your own simple programs and automate tasks that normally require lots of typing.
woman on laptop sitting at the window

Learn how to make, remove, copy, and do other things with directories and files in FreeDOS.