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Microsoft Opens the Code of Its Very First Operating System

Summary by Journal Du Geek
Before Windows, before the blue screens and even before MS-DOS, Microsoft was still DIYing its first software in a desktop corner. The company published the source code of PC-DOS 1.0, the operating system launched with the IBM PC in 1981.
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Journal du GeekJournal du Geek

Microsoft Opens the Code of Its Very First Operating System

Before Windows, before the blue screens and even before MS-DOS, Microsoft was still DIYing its first software in a desktop corner. The company published the source code of PC-DOS 1.0, the operating system launched with the IBM PC in 1981.

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Journal du Geek broke the news on Saturday, May 30, 2026.
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