SMRTR TechApr 30, 2026TechSpot

Microsoft releases the earliest DOS source code ever discovered as open source

SMRTR summary

Microsoft has released the earliest known DOS source code ever found, called the "Paterson Listings," named after 86-DOS creator Tim Paterson. The release includes the 86-DOS 1.00 kernel, PC-DOS development snapshots, and handwritten notes — offering rare insight into how MS-DOS was originally built before it shaped the PC industry.

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