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...e 1980s and the early 1990s, when it was gradually superseded by operating systems offering a graphical user interface (GUI), in various generations of the gr ...lel by Microsoft and IBM, the two products diverged after twelve years, in 1993, with recognizable differences in compatibility, syntax, and capabilities.

...MAME source code and extended it to include support for consoles, computer systems and calculators. That is not to say the scope was limited to only these 3 c ...oftware defined machine configurations, states etc, it may define multiple systems and/or machines