UTS (Universal Timesharing System) is a discontinued implementation of the

UNIX Unix (, ; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, a ...

operating system An operating system (OS) is system software that manages computer hardware and software resources, and provides common daemon (computing), services for computer programs. Time-sharing operating systems scheduler (computing), schedule tasks for ...

for

IBM mainframe IBM mainframes are large computer systems produced by IBM since 1952. During the 1960s and 1970s, IBM dominated the computer market with the 7000 series and the later System/360, followed by the System/370. Current mainframe computers in IBM' ...

(and compatible) computers. Amdahl created the first versions of UTS, and released it in May 1981, with UTS Global acquiring rights to the product in 2002. UTS Global has since gone out of business.

System requirements

UTS Release 4.5 supports the following S/390 model processors and their successors: * Amdahl 5990, 5995A, 5995M series of ECL processors * Amdahl Millennium Global Server series of

CMOS Complementary metal–oxide–semiconductor (CMOS, pronounced "sea-moss ", , ) is a type of MOSFET, metal–oxide–semiconductor field-effect transistor (MOSFET) semiconductor device fabrication, fabrication process that uses complementary an ...

processors * Fujitsu Global Server * IBM ES/9000/9021 series of ECL processors * IBM G4, G5 & G6 Servers (the 9672 R and X series of CMOS processors)

History

The UTS project had its origins in work started at

Princeton University Princeton University is a private university, private Ivy League research university in Princeton, New Jersey, United States. Founded in 1746 in Elizabeth, New Jersey, Elizabeth as the College of New Jersey, Princeton is the List of Colonial ...

in 1975 to port UNIX to the IBM VM/370 system. Team members there were Tom Lyon, Joseph Skudlarek, Peter Eichenberger, and

Eric Schmidt Eric Emerson Schmidt (born April 27, 1955) is an American businessman and former computer engineer who was the chief executive officer of Google from 2001 to 2011 and the company's chairman, executive chairman from 2011 to 2015. He also was the ...

. Tom Lyon joined Amdahl in 1978, and by 1979 there was a full Version 6 Unix system on the Amdahl 470 being used internally for design automation engineering. In late 1979 this was updated to the more commonly ported Version 7. In 1980 Amdahl announced support for Unix on the System 470. The UTS (Universal Timesharing System) also ran on National Advanced Systems mainframes. Five years later, IBM announced its own mainframe Unix, IX/370, as a competitive response to Amdahl. The

Intel 80386 The Intel 386, originally released as the 80386 and later renamed i386, is the third-generation x86 architecture microprocessor from Intel. It was the first 32-bit computing, 32-bit processor in the line, making it a significant evolution in ...

design team ported UTS to test the processor's viability to run Unix. The commercial versions of UTS were based on UNIX System III and

UNIX System V Unix System V (pronounced: "System Five") is one of the first commercial versions of the Unix operating system. It was originally developed by AT&T and first released in 1983. Four major versions of System V were released, numbered 1, 2, 3, an ...

. In 1986, Amdahl announced the first version to run

bare metal In information technology, bare machine (or bare-metal computer) is a computer which has no operating system. The software executed by a bare machine, commonly called a "bare metal program" or "bare metal application", is designed to interact dir ...

on IBM/370-compatible hardware, UTS/580 for the Amdahl 580 series of machines; previous Unix ports always ran as "guests" under the IBM VM

hypervisor A hypervisor, also known as a virtual machine monitor (VMM) or virtualizer, is a type of computer software, firmware or hardware that creates and runs virtual machines. A computer on which a hypervisor runs one or more virtual machines is called ...

. Performance improved by 25% without VM, the company said. Version 4.5 was based on Unix System V, Release 4 (SVR4). In 1987 Amdahl announced that it ended Aspen, a project started seven years earlier to create a proprietary operating system, and instead would focus on UTS.

References

External links

UTS Global home page (archived page at Archive.org, April 2008)
Unix variants 1981 software {{unix-stub

System requirements

History

See also

References

External links