MS-DOS - Wikipedia
https://en.wikipedia.org/wiki/MS-DOS
MS-DOS is an operating system for x86-based personal computers mostly developed by Microsoft. Collectively, MS-DOS, its rebranding as IBM PC DOS...
GitHub - microsoft/MS-DOS: The original sources of MS-DOS 1.25...
https://github.com/microsoft/MS-DOS
MS-DOS README in Greek. This repo contains the original source-code and compiled binaries for MS-DOS v1.25 and MS-DOS v2.0.