4 ms·

Well, the claim was "Graphical User Interface (GUI)", not "overlapping windows". There are many examples of GUIs without overlapping windows and even usability

• grahamlee 6y ago
  In fact Smalltalk-76 didn't have overlapping Windows, and the people at Apple had already come up with that before seeing the Smalltalk demo. Bill Atkinson describes that here. https://www.cnet.com/news/tracing-the-origins-of-the-macintosh/ https://www.cnet.com/news/tracing-the-origins-of-the-macinto... The screenshot in the article (which _does_ have overlapping windows) is evidently Smalltalk-80 because Smalltalk-76 used the "hollow colon" character in its message syntax where Smalltalk-80 uses the typographic colon.
  • Rochus 6y ago
    There might be a misconception. Have a look at Ingalls' 1978 paper "The Smalltalk-76 programming system design and implementation" (https://dl.acm.org/doi/10.1145/512760.512762 https://dl.acm.org/doi/10.1145/512760.512762) which clearly shows overlapping windows. There is even an online version based on the original source: https://www.lively-web.org/users/bert/Smalltalk-76.html https://www.lively-web.org/users/bert/Smalltalk-76.html