Data General AOS
Session
References
See also
Navigation menu"Computerworld Nov 22, 1982"expanding it
Proprietary operating systemsData GeneralOperating system stubs
operating systemsData General16-bitEclipseminicomputersAOS/VS IIEclipse MVring protectionEclipse MVINFOS IIDBMSOraclePDP-11command-line interpreterEaster eggcommandxyzzy32-bitAOS/VS IIUnixSystem VDG/UXEclipse MV88Kx86AViiONPL/I
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[1] (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.
Session
**** 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
****
References
^ Hoard, Bruce. "Computerworld Nov 22, 1982". Computerworld. IDG. Retrieved 2011-09-28..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
See also
- Data General RDOS
 | This operating-system-related article is a stub. You can help Wikipedia by expanding it. |
