Here are the key specs of the Apple’s  LISA OS from 1980’s

The Apple Lisa was a personal computer designed at Apple Computer, Inc. during the early 1980s. Officially, “Lisa” stood for “Local Integrated Software Architecture”, but it was also the name of Apple co-founder Steve Jobs’ daughter.

The Lisa project was started at Apple in 1978 and evolved into a project to design a powerful personal computer with a graphical user interface (GUI) that would be targeted toward business customers.

One of the features of the OS was that it came with a protected memory which was enabled by a crude hardware circuit. The OS was an improved version which came in after Apple III SOS operating system failed to have any impact three years prior.

The disk operating system on Lisa organised files in hierarchical directories. File system directories were able to make full use of the GUI “folders” with the Lisa. Lisa OS came with two main user modes: the Lisa Office System and the Workshop.

Lisa Office System was one of the advanced systems at that point of time, and it was renamed as “7/7”. This was done in reference to the seven application programs that the system offered: LisaWrite, LisaCalc, LisaDraw, LisaGraph, LisaProject, LisaList, and LisaTerminal.

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