FreeDOS aims to be a complete, free, 100% MS-DOS compatible operating system.

FreeDOS 1.0 Yes, the FreeDOS Project has reached the "1.0" milestone. Download FreeDOS - or buy it on CDROM. This is a very important day for FreeDOS. A lot of you have put in so much work over the years, helping to make everything perfect. Even if you didn't contribute code, you helped out the FreeDOS Project by submitting comments and bug reports. Thank you!

What is FreeDOS

FreeDOS is a free DOS-compatible operating system for IBM-PC compatible systems. FreeDOS is made of up many different, separate programs that act as "packages" to the overall FreeDOS Project.

These days, there are three main uses of FreeDOS:

  1. To run old DOS games (like DOOM, etc.)
  2. To run old business software that only supports DOS
  3. To support an embedded DOS system, such as a computerized cash register or till

You can run FreeDOS on pretty much anything. While can run FreeDOS on a dedicated PC, now it's most often run inside a PC emulator. You can find PC emulators for all computer platforms (Windows, Linux, Mac.) If you are new to DOS, we recommend you use an emulator to install and boot FreeDOS.

FreeDOS is open source software; you can view and edit our source code. Most FreeDOS programs are distributed under the GNU General Public License ("GNU GPL") which means they are not only open source software, but they are Free software. Because of this, FreeDOS would not exist were it not for all the people who contribute to it. Even if you didn't write code, you helped out the FreeDOS Project by submitting comments and bug reports.

We welcome new members to FreeDOS. You can help contribute to the FreeDOS Project by downloading our latest release and telling us what you think. We have a bug tracking system that helps you report problems and submit requests, and otherwise tell us how to improve FreeDOS. By participating in the development and debugging process, you help everyone.

What's new

FreeDOS 1.0
2006-09-03 00:22 -
Finally folks. It's finally here. FreeDOS 1.0 available in CD-ROM format can be downloaded at . Shortly, the larger and more featureful ISOs will also be uploaded. If you are having trouble booting from the CD-ROM, it is recommended to use Smart Boot Manager (, or download the FreeDOS boot floppy image at, which will start the installation process and then use the CD-ROM for the rest. A full floppy distro will be released at a later time. Sorry for the delay, by the way :-)
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Updated defrag 1.2
2006-08-31 12:26 -
We announced FreeDOS defrag 1.1 a few days ago, but there's an important update - possible disk corruption. Imre Leber writes: "I am hereby releasing a new version of defrag, defrag version 1.2. This solves the bug found by Fritz Mueller, regarding disk corruption in the root directory. I would like to thank Fritz Mueller for reporting this. Version 1.1 should NO LONGER BE USED, as it corrupts disk data." You can find the new DEFRAG12.ZIP at version at
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New fdshield update, fixes potential freeze
2006-08-31 05:39 -
Eric Auer writes: "Hi, as fdshield could conceivably freeze DOS, I replaced all "retf +2" commands in fdshield by less "invasive" code. This means that the updated fdshield no longer messes for example with the interrupt enabled / disabled state of the caller. The update should make fdshield generally more well-behaved. Note that nobody did yet report that fdshield froze his apps. Still an update should not hurt... The binary is 4kB small." Get the updated 2006aug31 fdshield at:
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