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Data General AOS

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Data General wrote operating systems for its hardware: DOS and RDOS for the Nova, AOS/VS and AOS/VS II for the Eclipse MV line, and a modified version of System V Unix called DG/UX for the Eclipse MV and AViiON machines. The AOS/VS software was far more advanced than competing PDP-11 operating systems, and was retained, running as a 16-bit compatibility application for the MV/8000, where Digital's VAX-VMS was entirely new. AOS/VS was the most commonly used DG software product, and included CLI (Command Line Interpreter) allowing for complex scripting, DUMP/LOAD, and other custom components.

The 16 bit version AOS is famous for including a command taken directly from the Colossal Cave Adventure game. A user typing in the command "xyzzy" would get back a response from the CLI of "Nothing Happens".

When a 32 bit version of AOS became available the same command instead reported "Twice As Much Happens"