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Re:Xbox and Windows NT 3.5 source code leaks online by klodolph on Thursday May 21, 2020 @10:55AM (#23259081)
The scheduler is radically different and that has knock-on effects on the rest of the OS. The OS gets a fixed time slice every frame before control is handed back to the game. The security model is engineered to distrust the user of the device as an anti-piracy measure.

It might be a derivative, but calling at a “custom version of Windows 2000” is absolutely wrong.

Re:Xbox and Windows NT 3.5 source code leaks online by temac on Thursday May 21, 2020 @02:00PM (#23262202)
There are also custom scheduling policies in the XBox One IIUC. I agree that a “custom version of Windows 2000” for the original XBox is wrong, but it is not extremely consequential in this article, I can see where it comes from, and I don't think its erroneous enough for it to be a big deal to be presented like that to the public; only experts will find the distinction interesting.

Saying it is a custom version of Mac OS, I would call it absolutely wrong. Here, just wrong is enough :p