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NOS (Network Operating System) is a discontinued
operating system An operating system (OS) is system software that manages computer hardware, software resources, and provides common daemon (computing), services for computer programs. Time-sharing operating systems scheduler (computing), schedule tasks for ef ...
with
time-sharing In computing, time-sharing is the sharing of a computing resource among many users at the same time by means of multiprogramming and multi-tasking.DEC Timesharing (1965), by Peter Clark, The DEC Professional, Volume 1, Number 1 Its emergence ...
capabilities, written by
Control Data Corporation Control Data Corporation (CDC) was a mainframe and supercomputer firm. CDC was one of the nine major United States computer companies through most of the 1960s; the others were IBM, Burroughs Corporation, DEC, NCR, General Electric, Honeywe ...
in the 1970s.''NOS Version 1 Reference manual''
Volume 1 of 2, version 60435400J (10 August 1979), Control Data Corporation, scanned PDF, 15MB, a
bitsavers.org
/ref> NOS ran on the 60-bit
CDC 6000 series The CDC 6000 series is a discontinued family of mainframe computers manufactured by Control Data Corporation in the 1960s. It consisted of the CDC 6200, CDC 6300, CDC 6400, CDC 6500, CDC 6600 and CDC 6700 computers, which were all extremely rapid ...
of
mainframe computer A mainframe computer, informally called a mainframe or big iron, is a computer used primarily by large organizations for critical applications like bulk data processing for tasks such as censuses, industry and consumer statistics, enterprise ...
s and their successors. NOS replaced the earlier CDC Kronos operating system of the 1970s. NOS was intended to be the sole operating system for all CDC machines, a fact CDC promoted heavily. NOS was replaced with NOS/VE on the
64-bit In computer architecture, 64-bit integers, memory addresses, or other data units are those that are 64 bits wide. Also, 64-bit CPUs and ALUs are those that are based on processor registers, address buses, or data buses of that size. A ...
Cyber-180 systems in the mid-1980s. Version 1 of NOS continued to be updated until about 1981; NOS version 2 was released early 1982.


Time-sharing commands

* ACCESS – selects the access subsystem * APL – selects APL programing language * ASCII – select fill 128-character
ASCII ASCII ( ), abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices. Because ...
* ATTACH – links to a permanent file * AUTO – automatically generate five-digit line numbers * BASIC – selects
BASIC BASIC (Beginners' All-purpose Symbolic Instruction Code) is a family of general-purpose, high-level programming languages designed for ease of use. The original version was created by John G. Kemeny and Thomas E. Kurtz at Dartmouth College ...
system * BATCH – selects the batch system * BEGIN – starts processing of CCL procedure (control language file) * BINARY – selects binary input mode * BRIEF – suppresses headers * BYE – log off the system * CALL – starts processing KCL procedure file (control language before CCL) * CATLIST – lists user's permanent files * CHANGE – changes parameters of a permanent file * CHARGE – set charge number and project number * CLEAR – releases all local files * CONVERT – converts character sets * (CR) – Carriage Return – requests terminal status if it is the first thing on a line * CSET – selects the terminal character-set mode * DAYFILE – lists a record of the user's activity *
DEBUG In computer programming and software development, debugging is the process of finding and resolving '' bugs'' (defects or problems that prevent correct operation) within computer programs, software, or systems. Debugging tactics can involve i ...
– activates or terminates CYBER interactive Debug * DEFINE – create a direct-access permanent file * DIAL – sends a one-line message to another terminal * EDIT – Selects the text editor * ENQUIRE – Requests the current job status * EXECUTE – selects the Execute subsystem * FORTRAN – selects the FORTRAN subsystem (FORTRAN 5) * FTNTS – Selects the FORTRAN Extended Version 4 compiler (CDC's enhanced version of FORTRAN 4) * FULL – Selects full-duplex mode * GET – gets a copy of a permanent file * GOODBYE – same as BYE * HALF – clears full-duplex mode * HELLO – logs out and starts login *
HELP Help is a word meaning to give aid or signal distress. Help may refer to: Arts, entertainment, and media Films * ''Help'' (2010 film), a Bollywood horror film * ''Help'' (2021 theatrical film), a British psychological thriller film * '' ...
– gets descriptions of NOS commands * LENGTH – requests the length of a file * LIB – get a copy of a permanent file * LIMITS – lists the user's limits * LIST – lists the contents of a file * LNH – same as LIST except no headers *
LOGIN In computer security, logging in (or logging on, signing in, or signing on) is the process by which an individual gains access to a computer system by identifying and authenticating themselves. The user credentials are typically some fo ...
– same as HELLO *
LOGOUT In computer security, logging in (or logging on, signing in, or signing on) is the process by which an individual gains access to a computer system by identifying and authenticating themselves. The user credentials are typically some form ...
– same as BYE * MONITOR – connects to a terminal * NEW – creates a new primary file * NORMAL – clears modes set by ASCII, AUTO, BRIEF, NOSORT, CSET, PARITY, and TAPE * NOSORT – prevents the system from sorting the primary file on the subsequent command * NULL – selects the null subsystem. * OLD – gets a copy of a permanent file * P – proceed * PACK – compress a file with several logical records into one logical record * PACKNAM – direct subsequent file requests to an auxiliary device * PARITY – set terminal parity * PASSWOR – change user password * PERMIT – grants another user permission to access a file * PRIMARY – makes temporary file the new primary file * PURGE – removes permanent files * RECOVER – allows user to resume after terminal was disconnected *
RENAME Rename may refer to: * Rename (computing), rename of a file on a computer * RENAME (command), command to rename a file in various operating systems * Rename (relational algebra), unary operation in relational algebra * Company renaming, rename ...
– changes file name * REPLACE – replace the contents of a permanent file with a temporary file * RESEQ – resequece or add line numbers to the primary file * SAVE – save a file permanently * SETASL – sets SRU account block limit (SRU = System Resurce Unit, on hard drive) * SETTL – set CPU time limit * SORT – sort the primary file * STATUS – same as ENQUIRE * STOP – terminates currently running programs * SUBMIT – submit a batch job deck image * TRAN – select NOS transaction subsystem * USER – get terminal number * X – process a time-sharing command as a batch command * XEDIT – select XEDIT editor From ''NOS Version 1 Terminal User's Instant Manual'', CDC, 1975-1980.


See also

* CDC Kronos * CDC SCOPE *
CDC display code Display code is the six-bit character code used by many computer systems manufactured by Control Data Corporation, notably the CDC3000 series and the following CDC 6000 series in 1964. The CDC 6000 series and their successors had 60 bit words. As ...


References

{{Time-sharing operating systems NOS Discontinued operating systems Time-sharing operating systems