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Your knowledge of the Alto and Star products obviously don't go much further than skin deep. A prototype released as a product is still a prototype.
Macintosh innovated heavily on the UI front, perhaps its biggest achievement was that the whole Mac UI concept was essentially a self learning system that lowered the bar at who could work with a computer significantly. Yes, the Alto and Star had a rudimentary UI and a mouse, but its functionality was severely limited, as most tasks would still require one to memorize commands. The Mac had the Menu Bar, which allowed someone to look up the commands available in a program and execute them directly trough menus instead.
The Mac also introduced things like resizable windows with the mouse, drag and drop in the Finder, overlapping Finder windows, ... which are traits that have come to be shared with all modern day graphical UI's and were non-existent in the Xerox machines. In hindsight, their machines were proofs of concept, whereas the Mac was the first finished, easy to use and commercially viable product.
Edited 2011-10-24 22:57 UTC
About the Xerox Star information that was posted previously:
Price:
Retailed for $16,595 in 1981 [Before Apple Lisa and Apple Macintosh]
Units Shipped:
Tens of thousands
If they were really "prototypes", people hadn't spend that much money in tens of thousands of Xerox Stars. People are not idiots. They spend that money in products, but you already knew that.




Member since:
2010-05-16
commercialized parts of the GUI ideas at Xerox, a
market Xerox wasn't interested in entering in the
first place.
"It was not a commercial product, but several thousand units were built and were heavily used at PARC, other Xerox facilities, and at several universities for many years."
in Apple. They also put a lot of work in actually
implementing and making the ideas from Xerox in an
actual usable product. The Xerox Alto was a concept,
not a finished product.
You don't sell thousands of "concepts". Anyway, if someone does not take Xerox Star into account, he can also make all type of conclusions...
Xerox Alto:
Price:
Never sold but often given away. Star, a commercial derivative of Alto eventually retailed for $16,595 in 1981
Units Shipped:
2,000 inside Xerox and to universities & research centers.
[There's more in http://www.digibarn.com/collections/systems/xerox-alto/]
The Xerox Star:
Introduced:
April 27, 1981
Price:
Retailed for $16,595 in 1981 [Before Apple Lisa and Apple Macintosh]
Units Shipped:
Tens of thousands
[There's more in http://www.digibarn.com/collections/systems/xerox-8010/index.html]