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AmigaOS
AmigaOS was developed by Commodore International for their Amiga line of computers. Originally, the operating system was called Workbench until it was renamed AmigaOS starting with version 3.5. Workbench 2.0 was released in June 1990 with the Amiga 3000 personal computer. Prior to Workbench 2.0, there was no unified design standard for Amiga applications. Workbench 2.0 included standard widget sets for a more unified user experience. Materials were also published providing guidelines for how to design and lay out applications for a consistent user experience. Workbench 2.0 also included enhancements that brought an object-oriented interface to the system.
Workbench 3.0 was released in September 1992 with the Amiga 1200 and 4000 personal computers. Major improvements included datatypes support, background image support, and localization. Datatypes allowed an application to load any file format supported by datatypes, and thanks to datatypes, any image in any format could be used as a background image provided that the necessary datatype was installed. Following Commodore's demise in 1994, Workbench wouldn't receive any further updates until 1999 when Haage & Partner were granted a license to update the aging OS. Under this license, Haage & Partner would release AmigaOS 3.5 in 1999 and AmigaOS 3.9 in 2000.
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