As part of the 40th anniversary celebration of the Apple Lisa computer, Apple released the source code of the Lisa OS version 3.1 operating system through the Computer History Museum, using the Apple Academic License Agreement. Apple released the Apple Lisa on January 19, 1983, a mouse-based GUI commercial computer named after the daughter of Apple co-founder Jobs. It was a commercial failure because it was prohibitively expensive ($9,995 retail, $30,000 in today’s dollars), but it paved the way for the hugely successful Macintosh computer a year later. Apple terminated the project in 1985. Lisa OS defines many GUI elements that we still use today, including drag-and-drop menus, movable windows, recycle bins, menu bars, drop-down menus, shortcut keys for copy and paste, control panels, overlapping windows, and one-key automatic system shutdown. Released in 1984, Lisa Office System 3.1 has a source code size of 26MB and contains more than 1,300 source files, including the main operating system, multiple applications, and the Lisa Toolkit development system.
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