Universal Time-Sharing System
Encyclopedia
UTS
The Universal Time-Sharing System (UTS) was an operating systemOperating system
An operating system is a set of programs that manage computer hardware resources and provide common services for application software. The operating system is the most important type of system software in a computer system...
for the XDS
Scientific Data Systems
Scientific Data Systems, or SDS, was an American computer company founded in September 1961 by Max Palevsky, a veteran of Packard Bell and Bendix, along with eleven other computer scientists. SDS was an early adopter of integrated circuits in computer design and the first to employ silicon...
Sigma line of computers, succeeding BTM/BPM. UTS was announced in 1966, but because of delays did not actually ship until 1971. It was designed to provide multi-programming services for online (interactive) user programs in addition to batch-mode production jobs, symbiont (spooled
Spooling
In computer science, spool refers to the process of placing data in a temporary working area for another program to process. The most common use is in writing files on a magnetic tape or disk and entering them in the work queue for another process. Spooling is useful because devices access data at...
) I/O, and critical real-time processes. System Daemons
Daemon (computing)
In Unix and other multitasking computer operating systems, a daemon is a computer program that runs as a background process, rather than being under the direct control of an interactive user...
, called "ghost jobs" were used to run monitor code in user space. The final release, D00, shipped in January, 1973. It was succeeded by the CP-V operating system, which combined UTS with the heavily batch-oriented XOS
Xerox Operating System
XOS was an operating system for the XDS Sigma line of computers "optimized for direct replacement of IBM DOS/360 installations" and to provide real-time and timesharing support ....
.
CP-V
The CP-V operating system, the compatible successor to UTS,was released in August, 1973. CP-V supported the same CPUs as UTS plus the Xerox 560. CP-V offered "single-stream and multiprogrammed batch; timesharing; and the remote processing mode, including intelligent remote batch." Realtime processing was added in release B00 in April, 1974, and transaction processing in release C00 in November, 1974.
CP-R
CP-R (Control Program for Real-Time) was a realtime variant of CP-V for Xerox 550 and Sigma 9 computer systems. CP-R supported three types of tasks: Foreground Primary Tasks, Foreground Secondary Tasks, and Batch Tasks.CP-6
In 1975 Xerox sold its computer business to HoneywellHoneywell
Honeywell International, Inc. is a major conglomerate company that produces a variety of consumer products, engineering services, and aerospace systems for a wide variety of customers, from private consumers to major corporations and governments....
, who ported CP-V to their 6000
Honeywell 6000 series
In 1970 General Electric sold their computing division to Honeywell. GE's 600-series machines were renamed as the Honeywell 6000 series and sold for a number of years.For complete details, see the GE-600 series entry....
computer line and renamed it CP-6. CP-6 was discontinued in 1988.