Open Sourcing DOS 4
Microsoft releases one of the most popular versions of MS-DOS as open source today. stikves shares a post:Ten years ago, Microsoft released the source for MS-DOS 1.25 and 2.0 to the Computer History Museum, and then later republished them for reference purposes. This code holds an important place in history and is a fascinating read of an operating system that was written entirely in 8086 assembly code nearly 45 years ago.

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