macOS NeXTSTEP Origins
Discussions center on the historical lineage of macOS and OS X as derivatives of NeXTSTEP, including its Mach kernel, BSD/UNIX foundations, and Apple's acquisition of NeXT after Copland's failure.
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There is still macOS as NeXTSTEP derivative.
You're thinking of NeXTSTEP. Before OS X.
iOS was based off NextStep, just like OSX.
You do know that MacOS predates NeXTSTEP, right?
Fun fact! NeXT was a commercial att unix fork. The transition from the unix base to the BSD base did infact happen at apple after the acquisition. The value of next was in its application library, which would eventually become the mac foundation libraries like coreaudio and cocoa etc. The earliest releases of Rhapsody are very illuminative about the architecture of XNU/OSX. I don't doubt that linux was considered. There's a specific time when the actual move of rhapsody to a freeb
early OSX being NeXTStep, not A/UX I would think.. all of this was very early days
Didn't apple choose NeXT largely in part of beOS notoriously hard to skin nature?
Mac OS X is a descendant of NeXTStep. It shares no code in common with classic Mac OS.
MacOS was absolutely derived from BSD through NeXTSTEP.
iOS≠macOS≠NeXTSTEP, but all three run Mach kernels.