macos sierra was the mac operating system software that was released on september 30, 2015.
what mac operating system software was released on september 30, 2015?
macos sierra
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the apple iigs system software utilizes a graphical user interface (gui) very similar to that of the macintosh and somewhat like gem for pcs and the operating systems of contemporary atari and amiga computers. initial versions of the system software are based on the prodos 16 operating system, which is based on the original prodos operating system for 8-bit apple ii computers. although it was modified so that 16-bit apple iigs software can run on it, prodos 16 was written largely in 8-bit code and does not take full advantage of the iigs's capabilities. later system software versions (starting with version 4.0) replaced prodos 16 with a new 16-bit operating system known as gs/os. it better utilizes the unique capabilities of the iigs and includes many valuable new features. the iigs system software was substantially enhanced and expanded over the years during which it was developed, culminating in its final official version, system 6.0.1, which was released in 1993. in july 2015, members of an american computer club released a new version of that system software, fixing some bugs.
apple iigs