Microsoft | MS-DOS 4.0 Realized
Microsoft publishes MS-DOS 4.00 open source
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Microsoft released MS-DOS 4.0 source code, binaries, disk images, and documentation. The nearly 45-year-old source code is now available under the MIT license, which means it can be freely manipulated, modified, and redistributed.
Ten years ago, Microsoft already donated the source code for MS-DOS 1.25 and 2.0 to the Computer History Museum, and then republished them on GitHub. The company notes that this code holds an important place in the history of the operating system, which was written entirely in assembly language for the 8086 nearly half a century ago.
