

“These materials aren’t just operating system releases in the traditional sense. In several cases, the listings represent point‑in‑time working states and hand-written notes, preserved by Tim Paterson himself. Think of them as a printed commit history of a Git repository."
No one’s going to be using these releases for real work. However, they’re still remarkably instructive for anyone who wants to understand how operating systems were structured on first‑generation 8086 hardware. DOS 1.0’s small size and feature limitations make it a comprehensible codebase that can be understood almost end‑to‑end, especially compared to today’s sprawling operating systems.
As Microsoft stated, “The listings include sources to the 86-DOS 1.00 kernel, several development snapshots of the PC-DOS 1.00 kernel, and some well-known utilities such as CHKDSK. Not only were these assembler listings, but there were also listings of the assembler itself! This work offers rare insight into how MS-DOS/PC-DOS came to be, and how operating system development was done at the time, not as it was later reconstructed.”
Yep, people were reporting that it was marking code they wrote by hand as “Coauthored by Copilot.”
There are some comments on the original pull request, such as:
I also thought that this was interesting, from the above article: