In 1982, after Steve Jobs was forced out of the Lisa project, he joined the Macintosh project. The Macintosh is not a direct descendant of Lisa, although there are obvious similarities between the systems. The final revision, the Lisa 2/10, was modified and sold as the Macintosh XL.
The Lisa was a more advanced system than the Macintosh of this time in many respects, such as its inclusion of protected memory, preemptive multitasking, a generally more sophisticated hard disk based operating system, a built-in screensaver, an advanced calculator with a paper tape and RPN, support for up to 2 megabytes of RAM, expansion slots, a numeric keypad, data corruption protection schemes such as block sparing, non-physical file names, and a larger higher-resolution display. It would be many years before many of those features were implemented on the Macintosh platform. Protected memory, for instance, didn't reappear until the Mac OS X operating system was released in 2001. The Macintosh featured a faster 68000 processor and sound. The complexity of the Lisa operating system and its programs taxed the 5 MHz Motorola 68000 microprocessor so that consumers said it felt sluggish, particularly when scrolling in documents.
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