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On May 6, 2002, Steve Jobs opened WWDC with a funeral for Classic Mac OS:

Yesterday, 18 years later, OS X finally reached its own end of the road: the next version of macOS is not 10.16, but 11.0.

There was no funeral.

The OS X Family Tree

OS X has one of the most fascinating family trees in technology; to understand its significance requires understanding each of its forebearers.

Unix: Unix does refer to a specific operating system that originated in AT&T’s Bell Labs (the copyrights of which are owned by Novell), but thanks to a settlement with the U.S. government (that was widely criticized for going easy on the telecoms giant), Unix was widely-licensed to universities in particular. One of the most popular variants that resulted was the Berkeley Software Distribution (BSD), developed at the University of California, Berkeley.

What all of the variations of Unix had in common was the Unix Philosophy; the Bell System Technical Journal explained in 1978:

A number of maxims have gained currency among the builders and users of the Unix system to explain and promote its characteristic style:

Make each program do one thing well. To do a new job, build afresh rather than complicate old programs by adding new “features”.
Expect the output of every program to become the input to another, as yet unknown, program. Don’t clutter output with extraneous information. Avoid stringently columnar or binary input formats. Don’t insist on interactive input.
Design and build software, even operating systems, to be tried early, ideally within weeks. Don’t hesitate to throw away the clumsy parts and rebuild them.
Use tools in preference to unskilled help to lighten a programming task, even if you have to detour to build the tools and expect to throw some of them out after you’ve finished using them.

[…]

The Unix operating system, the C programming language, and the many tools and techniques developed in this environment are finding extensive use within the Bell System and at universities, government laboratories, and other commercial installations. The style of computing encouraged by this environment is influencing a new generation of programmers and system designers. This, perhaps, is the most exciting part of the Unix story, for the increased productivity fostered by a friendly environment and quality tools is essential to meet every-increasing demands for software.

Today you can still run nearly any Unix program on macOS, but particularly with some of the security changes made in Catalina, you are liable to run into permissions issues, particularly when it comes to seamlessly linking programs together.

Mach: Mach was a microkernel developed at Carnegie Mellon University; the concept of a microkernel is to run the smallest amount of software necessary for the core functionality of an operating system in the most privileged mode, and put all other functionality into less privileged modes. OS X doesn’t have a true microkernel — the BSD subsystem runs in the same privileged mode, for performance reasons — but the modular structure of a microkernel-type design makes it easier to port to different processor architectures, or remove operating system functionality that is not needed for different types of devices (there is, of course, lots of other work that goes into a porting a modern operating system; this is a dramatic simplification).

More generally, the spirit of a microkernel — a small centralized piece of software passing messages between different components — is how modern computers, particularly mobile devices, are architected: multiple specialized chips doing discrete tasks under the direction of an operating system organizing it all.

Xerox: The story of Steve Jobs’ visiting Xerox is as mistaken as it is well-known; the Xerox Alto and its groundbreaking mouse-driven graphical user interface was well-known around Silicon Valley, thanks to the thousands of demos the Palo Alto Research Center (PARC) did and the papers it had published. PARC’s problem is that Xerox cared more about making money from copy machines than in figuring out how to bring the Alto to market.

That doesn’t change just how much of an inspiration the Alto was to Jobs in particular: after the visit he pushed the Lisa computer to have a graphical user interface, and it was why he took over the Macintosh project, determined to make an inexpensive computer that was far easier to use than anything that had come before it.

Apple: The Macintosh was not the first Apple computer: that was the Apple I, and then the iconic Apple II. What made the Apple II unique was its explicit focus on consumers, not businesses; interestingly, what made the Apple II successful was VisiCalc, the first spreadsheet application, which is to say that the Apple II sold primarily to businesses. Still, the truth is that Apple has been a consumer company from the very beginning.

This is why the Mac is best thought of as the child of Apple and Xerox: Apple understood consumers and wanted to sell products to them, and Xerox provided the inspiration for what those products should look like.

It was NeXTSTEP, meanwhile, that was the child of Unix and Mach: an extremely modular design, from its own architecture to its focus on object-oriented programming and its inclusion of different “kits” that were easy to fit together to create new programs.

And so we arrive at OS X, the child of the classic Macintosh OS and NeXTSTEP. The best way to think about OS X is that it took the consumer focus and interface paradigms of the Macintosh and layered them on top of NeXTSTEP’s technology. In other words, the Unix side of the family was the defining feature of OS X.

Return of the Mac

In 2005 Paul Graham wrote an essay entitled Return of the Mac explaining why it was that developers were returning to Apple for the first time since the 1980s:

All the best hackers I know are gradually switching to Macs. My friend Robert said his whole research group at MIT recently bought themselves Powerbooks. These guys are not the graphic designers and grandmas who were buying Macs at Apple’s low point in the mid 1990s. They’re about as hardcore OS hackers as you can get.

The reason, of course, is OS X. Powerbooks are beautifully designed and run FreeBSD. What more do you need to know?

Graham argued that hackers were a leading indicator, which is why he advised his dad to buy Apple stock:

If you want to know what ordinary people will be doing with computers in ten years, just walk around the CS department at a good university. Whatever they’re doing, you’ll be doing.

In the matter of “platforms” this tendency is even more pronounced, because novel software originates with great hackers, and they tend to write it first for whatever computer they personally use. And software sells hardware. Many if not most of the initial sales of the Apple II came from people who bought one to run VisiCalc. And why did Bricklin and Frankston write VisiCalc for the Apple II? Because they personally liked it. They could have chosen any machine to make into a star.

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If you want to attract hackers to write software that will sell your hardware, you have to make it something that they themselves use. It’s not enough to make it “open.” It has to be open and good. And open and good is what Macs are again, finally.

What is interesting is that Graham’s stock call could not have been more prescient: Apple’s stock closed at $5.15 on March 31, 2005, and $358.87 yesterday;1 the primary driver of that increase, though, was not the Mac, but rather the iPhone.

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The iOS Sibling

If one were to add iOS to the family tree I illustrated above, most would put it under Mac OS X; I think, though, iOS is best understood as another child of Classic Mac and NeXT, but this ti