MS-DOS is not dead!
FreeDOS is a complete, free, DOS-compatible operating system that you can use to play classic DOS games, run legacy business software, or develop embedded systems. Any program that works on MS-DOS should also run on FreeDOS.
It doesn’t cost anything to download and run FreeDOS. Even better, you can view and edit the source code. All FreeDOS programs are distributed under the GNU General Public License or a similar open source software license.
And if you wait until Christmas Day 2016 you can get the new 1.2 version.
If you know nothing about virtual machines or are not prepared to destroy your existing system please do not experiment with this. But if you have a real need for old MS-DOS software or games then this is for you.