After years, people doesn’t use Disk Operating System (DOS) anymore. Among many DOS systems ever available, MS-DOS was the most popular for desktop computers. But probably for some purposes such learning the basic of Windows command system, learning to install an OS with many disk series (and how to do it later on Debian), playing old DOS games, or any other learning purpose, you will need MS-DOS again. But MS-DOS was proprietary and was abandoned by Microsoft. Don’t worry, free software community has created FreeDOS as 1:1 replacement for MS-DOS. FreeDOS was licensed with GNU GPL v2 and available freely. It’s almost 100% compatible with MS-DOS internally (to help install some Windows systems) or externally (to install many MS-DOS games or programs). Now, we want to share how to install FreeDOS in Virtualbox. We use Ubuntu as host.

Obtain FreeDOS ISO Image

You should have FreeDOS image first. Download it from FreeDOS official site https://www.freedos.org/download. For example, we download fd11src.iso 40 MB.
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