Microsoft open-sources “the earliest DOS source code discovered to date”

Today’s source release is so old that it predates the MS-DOS branding, and it includes “sources to the 86-DOS 1.00 kernel, ...

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 ...
XDA Developers on MSN

Microsoft open-sources MS-DOS 1.0, offering a rare look at PC history

This is a rare look at the tech giant's first operating system ...
Redmondmag.com

Microsoft Open Sources Earliest DOS Code on Anniversary

Microsoft on Tuesday released the earliest known DOS source code materials found to date to mark the 45th anniversary of 86-DOS 1.00.

Microsoft open-sources 86-DOS 1.00, the ancestor of Windows

The source code for 86-DOS 1.00, the OS that eventually became MS-DOS and Windows, is now available on GitHub.

Microsoft releases earliest known DOS source code

DOS, Microsoft is releasing the earliest known source code listings – transcribed from yellowed continuous printouts.
Hackaday

Transcribing The Source Of The First DOS For The IBM PC

Doing software archaeology can be a harrowing task, as rarely do you find complete snapshots of particular versions of ...