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 meant to honor Xyzzy (which was pronounced "magic"). This was the internal code name of what externally became known as the AOS/VS 32-bit operating system. 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 x86AViiON 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 DG/L a variant of the ALGOL/60 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.
Sessionedit
**** Atari S/W Development HCD1 / BATCH OUTPUT FILE **** AOS/VS 3.07 / EXEC 3.07 19-JAN-84 10:11:01 QPRI=254 SEQ=31324 INPUT FILE -- :UDD:SYSTEMS:850:?031.CLI.004.JOB (WILL BE DELETED AFTER PROCESSING) LIST FILE -- :QUEUE:NORDIN.LIST.31324 -------- LAST MESSAGE CHANGE 12-JAN-84 16:06:08 Atari S/W Development System HCD1 Backup schedule (system shut down): Saturday 21-Jan-84 9:30-11:30am Refer to HELP *COMMANDS, HELP *PSEUDO, HELP, APHELP, and ?MHELP. Refer to DISP FUNC in SED for list of default function key commands. -------- LAST PREVIOUS LOGON 19-JAN-84 10:09:45 * searchlist :UDD:NORDIN:UTIL :UDD:NORDIN:LINKS :C :UTIL : AOS/VS CLI REV 03.03.00.00 19-JAN-84 10:11:05 Ý SEARCHLIST :UDD:SYSTEMS:UTIL,:UDD:NORDIN:UTIL,:UDD:NORDIN:LINKS,:C,:UTIL,: Ý DIRECTORY :UDD:SYSTEMS:850 Ý DEFACL SYSTEMS,OWARE,A.JOE,OWARE,A.OLIVIA,OWARE,ARKEN,OWARE,BLOTCKY,OWARE,NORDIN,OWARE,TITTSLER,OWARE,FOWKES,OWARE Ý CAMAC R850AMAC H=R850AMAC.OBJ L=R850AMAC.PRN R=F SL=132 ATARI CAMAC Assembler Ver 1.0A Copyright 1981 ATARI Inc. Enter source file name and options d:R850AMAC h=d:R850AMAC.OBJ l=d:R850AMAC.PRN R=F SL=132 Pass 1 - Reading D1:R850AMAC. Pass 2 - Reading D1:R850AMAC. no ERRORs, 669 Labels, $67E8 free. � ATARI CAMAC Assembler Ver 1.0A Copyright 1981 ATARI Inc. Enter source file name and options Ý Ý END OF FILE AOS/VS CLI TERMINATING 19-JAN-84 10:12:06 PROCESS 42 TERMINATED ELAPSED TIME 0:01:06 (OTHER JOBS, SAME USERNAME) USER 'NORDIN' LOGGED OFF 19-JAN-84 10:12:07 **** * LIST FILE EMPTY, WILL NOT BE PRINTED ****
data, general, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, december, 20. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Data General AOS news newspapers books scholar JSTOR December 2008 Learn how and when to remove this template message Data General AOS an abbreviation for Advanced Operating System 1 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 2 1980 and later AOS VS II 1988 for the 32 bit Eclipse MV line Data General AOSDeveloperData GeneralWorking stateDiscontinuedSource modelClosed sourcePlatformsData General 16 bit Eclipse C M and S minicomputers and 32 bit Eclipse MV lineDefaultuser interfaceCommand line interpreterLicenseProprietary commercial software Contents 1 Overview 2 Session 3 See also 4 ReferencesOverview editAOS 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 meant to honor Xyzzy which was pronounced magic This was the internal code name of what externally became known as the AOS VS 32 bit operating system 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 DG L a variant of the ALGOL 60 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 Session edit Atari S W Development HCD1 BATCH OUTPUT FILE AOS VS 3 07 EXEC 3 07 19 JAN 84 10 11 01 QPRI 254 SEQ 31324 INPUT FILE UDD SYSTEMS 850 031 CLI 004 JOB WILL BE DELETED AFTER PROCESSING LIST FILE QUEUE NORDIN LIST 31324 LAST MESSAGE CHANGE 12 JAN 84 16 06 08 Atari S W Development System HCD1 Backup schedule system shut down Saturday 21 Jan 84 9 30 11 30am Refer to HELP COMMANDS HELP PSEUDO HELP APHELP and MHELP Refer to DISP FUNC in SED for list of default function key commands LAST PREVIOUS LOGON 19 JAN 84 10 09 45 searchlist UDD NORDIN UTIL UDD NORDIN LINKS C UTIL AOS VS CLI REV 03 03 00 00 19 JAN 84 10 11 05 Y SEARCHLIST UDD SYSTEMS UTIL UDD NORDIN UTIL UDD NORDIN LINKS C UTIL Y DIRECTORY UDD SYSTEMS 850 Y DEFACL SYSTEMS OWARE A JOE OWARE A OLIVIA OWARE ARKEN OWARE BLOTCKY OWARE NORDIN OWARE TITTSLER OWARE FOWKES OWARE Y CAMAC R850AMAC H R850AMAC OBJ L R850AMAC PRN R F SL 132 ATARI CAMAC Assembler Ver 1 0A Copyright 1981 ATARI Inc Enter source file name and options d R850AMAC h d R850AMAC OBJ l d R850AMAC PRN R F SL 132 Pass 1 Reading D1 R850AMAC Pass 2 Reading D1 R850AMAC no ERRORs 669 Labels 67E8 free ATARI CAMAC Assembler Ver 1 0A Copyright 1981 ATARI Inc Enter source file name and options Y Y END OF FILE AOS VS CLI TERMINATING 19 JAN 84 10 12 06 PROCESS 42 TERMINATED ELAPSED TIME 0 01 06 OTHER JOBS SAME USERNAME USER NORDIN LOGGED OFF 19 JAN 84 10 12 07 LIST FILE EMPTY WILL NOT BE PRINTED See also editData General RDOS CEO Data General References edit Dg Software Aos 093 000198 01 AOS Library File Editor UM Apr77 raw Hoard Bruce 22 November 1982 Computerworld Nov 22 1982 Computerworld IDG Retrieved 2011 09 28 nbsp This operating system related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Data General AOS amp oldid 1195894669, wikipedia, wiki, book, books, library,
