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Comment by TickleSteve

Mach was never based on BSD, it replaced it. Mach is the descendant of the Accent and Aleph kernels. BSD came into the frame for the userland tools.

"Mach was developed as a replacement for the kernel in the BSD version of Unix," (https://en.wikipedia.org/wiki/Mach_(kernel))

Interestingly, MkLinux was the same type of project but for Linux instead of BSD (i.e. Linux userland with Mach kernel).

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