As someone who went to PARC and saw the cool stuff years before Jobs did, I don't think he stole their idea. The PARC approach was to build the future expensively and wait for hardware to catch up. Eventually the hardware did, but not until the late 1980s.
Kay had a vision, but his vision was quite different from the way personal computing went. He was thinking of closed systems which would replace dedicated word processors. The Xerox Star was the result. Imagine a machine with Microsoft Office built-in, with all the software installed at the factory.
Kay also had a thing for discrite-event simulation as the killer app. Kay wrote, in Personal Dynamic Media, "In a very real sense, simulation is the central notion of the Dynabook." This matched well to Smalltalk, which was the successor to Simula-67, an ALGOL dialect with objects for discrite-event simulation. All that "message" stuff came from the simulation world, where you have many asynchronous blocks passing events around.
The real successors to the PARC work were the first generation of UNIX workstations. The Three Rivers PERQ, the Apollo, the Sun I, and the Apple Lisa all predated the Macintosh. They were all much better, but much more expensive. The UNIX workstation era tends to be forgotten, but those were the first good desktop computers. Macs were toys.
The original Mac was a flop. No hard drive, 128K RAM, too slow, and too expensive. The competition was the IBM PC/AT - 20MB hard drive, about 1MB RAM. This almost killed Apple. Not until the Macintosh SE (1989) did Apple have a built-in hard drive. In the Apple II era, Apple had a majority of desktop system market share. The Mac in the 1980s had about 15%, which gradually declined.
Kay had a vision, but his vision was quite different from the way personal computing went. He was thinking of closed systems which would replace dedicated word processors. The Xerox Star was the result. Imagine a machine with Microsoft Office built-in, with all the software installed at the factory.
Kay also had a thing for discrite-event simulation as the killer app. Kay wrote, in Personal Dynamic Media, "In a very real sense, simulation is the central notion of the Dynabook." This matched well to Smalltalk, which was the successor to Simula-67, an ALGOL dialect with objects for discrite-event simulation. All that "message" stuff came from the simulation world, where you have many asynchronous blocks passing events around.
The real successors to the PARC work were the first generation of UNIX workstations. The Three Rivers PERQ, the Apollo, the Sun I, and the Apple Lisa all predated the Macintosh. They were all much better, but much more expensive. The UNIX workstation era tends to be forgotten, but those were the first good desktop computers. Macs were toys.
The original Mac was a flop. No hard drive, 128K RAM, too slow, and too expensive. The competition was the IBM PC/AT - 20MB hard drive, about 1MB RAM. This almost killed Apple. Not until the Macintosh SE (1989) did Apple have a built-in hard drive. In the Apple II era, Apple had a majority of desktop system market share. The Mac in the 1980s had about 15%, which gradually declined.