[johnflan]

I’d love to know more about its design too

[KerrAvon]

Apple published a book about it: https://dl.acm.org/doi/10.5555/524838

[mrpippy]

A bunch of documentation was posted here, although I’m not sure the links still work (might need to go through archive.org)

https://www.pagetable.com/?p=211