In a celebration of innovation and preserving computing history, Microsoft has released the source code for MS-DOS 4.00 in partnership with IBM. The release includes the operating system's source code, binary files, and original documentation.
The decision to open source MS-DOS 4.00 was driven by a researcher named Connor 'Starfrost' Hyde's discovery of unreleased beta binaries of DOS 4.0 from former Microsoft CTO Ray Ozzie's old floppy disks.
Scott Hanselman imaged the original disks and scanned printed documents from the 'Ozzie Drop.' Despite being unable to find the full source code for MT-DOS, Microsoft and IBM opted to release DOS 4.00 due to its historical significance.
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