dos(disk operating system) it is used to run older programs and
junk
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Use DosBox http://www.dosbox.com/
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You can't run MS-DOS, windows is different operating system.
You can type cmd to invoke command prompt.
Also, you could install DOSBox to run DOS programs, OR install
VirtualBox and install DOS inside it.
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DOS is well-suited for older computers that are not powerful
enough to run a modern operating system such as Linux or Windows.
If you have a modern PC, DOS programs can be run with DOSBox.