Interesting - what's the provenance of this? Is this a leaked copy of the System source, or a disassembly/decompile?

It's a copy of the Toolbox ROM code for the Quadra 660AV. It's a real leak, not reverse engineered. You can see comments on the code from the early 80s by the original Macintosh team. It was published online (I think on Applefritter or something) about 20 years ago by a former Apple employee who was having some sort of mental breakdown. He believed it contained proof that Apple was complicit in subjecting its employees to MKULTRA mind control and ran underground maglev trains to other dimensions.

Is there an article or something covering this? Too wild

I don't think there was anything beyond the original forum post. Even back then it was already ancient code that Apple was no longer using, so there wasn't any legal drama etc.

I would love to see that forum post

I took a screenshot of it when I first read it. Here's a version of the post with all the PII stripped out because I don't want to cause him or anyone he mentioned any trouble. https://files.catbox.moe/vonlwq.png

Damn that's some serious rebound from leaving Steve's Reality Distortion Field.

Holy crap. I was not aware of that context - that's wild.

It's a leaked copy of the System 7.1 source code - just the System itself; it doesn't include any applications, control panels, or extensions. (So code for things like the Finder or QuickTime aren't included.)

I'm not certain where it came from precisely; from what I understand, it's been circulating online for ages. Apple hasn't authorized its release, but, as far as I'm aware, they haven't made any attempt to suppress it either.

It's a leaked version of the Mac toolbox ROM source code circa very early 1994.

Or a screenshot! But what’s the fun in that?

Exactly. One of the cool things about doing this the hard way was discovering that Apple still hosts old system and programmers manuals like the one for QuickDraw on its website.