A decade after releasing the source code for MS-DOS 1.1 and MS-DOS 2.0, Microsoft has open sourced a (slightly) more recent operating system: MS-DOS 4.0. First released in 1988, you can now download the source code from GitHub, where it’s been shared under the MIT license. Of course there’s not much reason to actually run MS-DOS […] The post Microsoft releases source code for MS-DOS 4.0 (and Multitasking DOS) appeared first on Liliputing.