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• Data_General_AOS abstract "AOS was the name of a family of operating systems for Data General 16-bit Eclipse C, M, and S minicomputers, followed by AOS/VS and AOS/RT32 (1980) and later AOS/VS II (1988) for the 32-bit Eclipse MV line.AOS/VS exploited the 8-ring protection architecture of the Eclipse MV hardware with ring 7 being the least privileged and ring 0 being the most privileged. The AOS/VS kernel ran in ring 0 and used ring-1 addresses for data structures related to virtual address translations. Ring 2 was unused and reserved for future use by the kernel. The Agent, which performed much of the system call validation for the AOS/VS kernel, as well as some I/O buffering and many compatibility functions, ran in ring 3 of each process. Ring 4 was used by various D.G. products such as the INFOS II DBMS. Rings 5 and 6 were reserved for use by user programs but rarely used except for large software such as the MV/UX inner-ring emulator and Oracle which used ring 5. All user programs ran in ring 7.The AOS software was far more advanced than competing PDP-11 operating systems. 16-bit AOS applications ran natively under AOS/VS and AOS/VS II on the 32-bit Eclipse MV line. AOS/VS (Advanced Operating System/Virtual Storage) was the most commonly used DG software product, and included a command-line interpreter (CLI) allowing for complex scripting, DUMP/LOAD, and other custom components.The 16-bit version of the CLI is famous for including an Easter egg 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 the CLI became available under AOS/VS II, the same command instead reported \"Twice As Much Happens\".A modified version of System V.2 Unix called MV/UX hosted under AOS/VS was also available. A modified version of System V Unix called DG/UX was made for the Eclipse MV line and later the 88K and x86 AViiON machines.The AOS and AOS/VS kernels were written entirely in assembly language. Almost all of the AOS and AOS/VS utilities included in the operating system releases were written in variants of the PL/I programming language. Initially, AOS/VS utilities closely tracked AOS source development. As AOS/VS matured, many DG-supplied utilities were rewritten to take advantage of the 32-bit address space and reduce dependencies on assembly language, often resulting in substantial increases in functionality, performance and reliability compared with their AOS ancestors.".
• Data_General_AOS wikiPageID "4587819".
• Data_General_AOS wikiPageLength "3384".
• Data_General_AOS wikiPageOutDegree "31".
• Data_General_AOS wikiPageRevisionID "621992987".
• Data_General_AOS wikiPageWikiLink 16-bit.
• Data_General_AOS wikiPageWikiLink 32-bit.
• Data_General_AOS wikiPageWikiLink VS_II.
• Data_General_AOS wikiPageWikiLink Aviion.
• Data_General_AOS wikiPageWikiLink Category:Data_General.
• Data_General_AOS wikiPageWikiLink Category:Proprietary_operating_systems.
• Data_General_AOS wikiPageWikiLink Colossal_Cave_Adventure.
• Data_General_AOS wikiPageWikiLink Command-line_interface.
• Data_General_AOS wikiPageWikiLink Command_(computing).
• Data_General_AOS wikiPageWikiLink UX.
• Data_General_AOS wikiPageWikiLink Data_General.
• Data_General_AOS wikiPageWikiLink Data_General_Eclipse.
• Data_General_AOS wikiPageWikiLink 8000.
• Data_General_AOS wikiPageWikiLink Data_General_RDOS.
• Data_General_AOS wikiPageWikiLink Database.
• Data_General_AOS wikiPageWikiLink Easter_egg_(media).
• Data_General_AOS wikiPageWikiLink INFOS_II.
• Data_General_AOS wikiPageWikiLink Minicomputer.
• Data_General_AOS wikiPageWikiLink Motorola_88000.
• Data_General_AOS wikiPageWikiLink Operating_system.
• Data_General_AOS wikiPageWikiLink Oracle_Database.
• Data_General_AOS wikiPageWikiLink PDP-11.
• Data_General_AOS wikiPageWikiLink I.
• Data_General_AOS wikiPageWikiLink Protection_ring.
• Data_General_AOS wikiPageWikiLink UNIX_System_V.
• Data_General_AOS wikiPageWikiLink Unix.
• Data_General_AOS wikiPageWikiLink X86.
• Data_General_AOS wikiPageWikiLink Xyzzy_(computing).
• Data_General_AOS wikiPageWikiLinkText "AOS".
• Data_General_AOS wikiPageWikiLinkText "AOS/VS".
• Data_General_AOS wikiPageWikiLinkText "Data General AOS".
• Data_General_AOS wikiPageWikiLinkText "Data General's AOS".
• Data_General_AOS wikiPageUsesTemplate Template:Operating-system-stub.
• Data_General_AOS wikiPageUsesTemplate Template:Refimprove.
• Data_General_AOS subject Category:Data_General.
• Data_General_AOS subject Category:Proprietary_operating_systems.
• Data_General_AOS hypernym Family.
• Data_General_AOS type Company.
• Data_General_AOS type Company.
• Data_General_AOS type Page.
• Data_General_AOS comment "AOS was the name of a family of operating systems for Data General 16-bit Eclipse C, M, and S minicomputers, followed by AOS/VS and AOS/RT32 (1980) and later AOS/VS II (1988) for the 32-bit Eclipse MV line.AOS/VS exploited the 8-ring protection architecture of the Eclipse MV hardware with ring 7 being the least privileged and ring 0 being the most privileged. The AOS/VS kernel ran in ring 0 and used ring-1 addresses for data structures related to virtual address translations.".
• Data_General_AOS label "Data General AOS".
• Data_General_AOS sameAs Q5227169.
• Data_General_AOS sameAs VS.
• Data_General_AOS sameAs m.0cbb5z.
• Data_General_AOS sameAs Q5227169.
• Data_General_AOS wasDerivedFrom Data_General_AOS?oldid=621992987.
• Data_General_AOS isPrimaryTopicOf Data_General_AOS.