Microsoft finally open sources DOS 1.0 - and it's so much more than the code
Microsoft has open-sourced PC-DOS 1.0, its first operating system, providing a glimpse into the early days of personal computing. This release includes not only the source code but also annotations and historical notes from its creator, Tim Paterson. The move reflects Microsoft's ongoing commitment to embracing open source and preserving computing history.
- ▪PC-DOS 1.00 was crucial in establishing Microsoft as a leading company in the tech industry.
- ▪Microsoft acquired 86-DOS for under $100,000 to quickly develop an operating system for IBM's PC.
- ▪The open-sourcing of DOS 1.0 allows developers and enthusiasts to explore and experiment with early computing technology.
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Business Home Business Companies Microsoft Microsoft finally open sources DOS 1.0 - and it's so much more than the code Want a blast from the past? Microsoft just open-sourced its very first operating system, offering a rare insight into the PC's earliest days. Written by Steven Vaughan-Nichols, Senior Contributing EditorSenior Contributing Editor April 28, 2026 at 11:45 a.m. PT MicrosoftFollow ZDNET: Add us as a preferred source on Google.ZDNET's key takeawaysPC-DOS 1.00 would lead to Microsoft becoming computing's top dogMicrosoft continues to embrace open source. The source code and annotations provide insight into the operating system's earliest days.Before "Micro Soft" became Microsoft, Bill Gates wrote BASIC interpreters.
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