As the speed of light in meters per second ( c < sub > 0 </ sub >) is fixed in the International System of Units, this measurement of the speed of light in AU / d ( c < sub > AU </ sub >) also determines the value of the astronomical unit in meters ( A ):

The remainder of day two included a two-second mid-course correction burn performed by the Command / Service Module's Service Propulsion System engine to tweak the spacecraft's trajectory.

While over the far side of the Moon, the Command / Service Module's Service Propulsion System engine burned for six minutes and fifteen seconds, braking the spacecraft into an orbit around the Moon with a low point ( pericynthion ) of 58. 3 and a high point ( apocynthion ) of 170. 4 nautical miles ( 108. 0 and 315. 6 km, respectively ).

* Attached Support Processor, one of the two early IBM System / 360 programs that replaces the native SPOOL facilities of OS / 360 ; the other was Houston Automatic Spooling Priority ( HASP ).

Originally released for the IBM 6150 RISC workstation, AIX now supports or has supported a wide variety of hardware platforms, including the IBM RS / 6000 series and later IBM POWER and PowerPC-based systems, IBM System i, System / 370 mainframes, PS / 2 personal computers, and the Apple Network Server.

Among other variants, IBM later produced AIX Version 3 ( also known as AIX / 6000 ), based on System V Release 3, for their IBM POWER-based RS / 6000 platform.

Since 1990, AIX has served as the primary operating system for the RS / 6000 series ( later renamed IBM eServer pSeries, then IBM System p, and now IBM Power Systems ).

The original AIX ( sometimes called AIX / RT ) was developed for the IBM 6150 RT workstation by IBM in conjunction with Interactive Systems Corporation, who had previously ported UNIX System III to the IBM PC for IBM as PC / IX.

AIX / 370 was IBM's third attempt to offer Unix-like functionality for their mainframe line, specifically the System / 370 ( the prior versions were a TSS / 370 based Unix system developed jointly with AT & T c. 1980, and VM / IX a VM / 370 based system developed jointly with Interactive Systems Corporation c. 1984 ).

AIX / 370 was released in 1990 with functional equivalence to System V Release 2 and 4. 3BSD as well as IBM enhancements.

With the introduction of the ESA / 390 architecture, AIX / 370 was replaced by AIX / ESA in 1991, which was based on OSF / 1, and also ran on the System / 390 platform.

Two other satellites made observations at the time of the impact: the Ulysses spacecraft, primarily designed for solar observations, was pointed towards Jupiter from its location 2. 6 AU away, and the distant Voyager 2 probe, some 44 AU from Jupiter and on its way out of the Solar System following its encounter with Neptune in 1989, was programmed to look for radio emission in the 1 – 390 kHz range.

Mature versions of the Commodore, SWTPC, Atari and Apple home computer systems all featured a disk operating system ( actually called ' DOS ' in the case of the Commodore 64 ( CBM DOS ), Atari 800 ( Atari DOS ), and Apple II machines ( Apple DOS )), as did ( at the other end of the hardware spectrum, and much earlier ) IBM's System / 360, 370 and ( later ) 390 series of mainframes ( e. g., DOS / 360: Disk Operating System / 360 and DOS / VSE: Disk Operating System / Virtual Storage Extended ).

GDB target processors ( as of 2003 ) include: Alpha, ARM, AVR, H8 / 300, System / 370, System 390, X86 and its 64-bit extension X86-64, IA-64 " Itanium ", Motorola 68000, MIPS, PA-RISC, PowerPC, SuperH, SPARC, and VAX.

The System / 360 later evolved into the System / 370, the System / 390, and the 64-bit zSeries, System z, and zEnterprise machines.

The primary operating systems in use on current IBM mainframes include z / OS ( which followed MVS and OS / 390 ), z / VM ( previously VM / CMS ), z / VSE ( which is in the DOS / 360 lineage ), z / TPF ( a successor of Airlines Control Program ), and Linux on System z such as SUSE Linux Enterprise Server and others.

There are software-based emulators for the System / 370, System / 390, and System z hardware, including FLEX-ES and the freely available Hercules emulator which runs under Linux, FreeBSD, Solaris, Mac OS X and Microsoft Windows.

Multiple Virtual Storage, more commonly called MVS, was the most commonly used operating system on the System / 370 and System / 390 IBM mainframe computers.

First released in 1974, MVS was extended by program products with new names multiple times, first to MVS / SE ( System Extension ), next to MVS / SP ( System Product ) Version 1, next to MVS / XA ( eXtended Architecture ), next to MVS / ESA ( Enterprise Systems Architecture ), next to OS / 390 and finally to z / OS ( when 64-bit support was added with the zSeries models ).

) Later compatible IBM systems include the 3090, the ES / 9000 family, 9672 ( System / 390 family ), the zSeries, System z9, System z10 and IBM zEnterprise System.

* IBM System / 370, System / 390, and zSeries mainframes

Systems like the Compatible Time-Sharing System introduced the concept of a file system, which managed several virtual " files " on one storage device, giving the term its present-day meaning.

Many of the text elements are found in the 1988 ISO technical report TR 9537 Techniques for using SGML, which in turn covers the features of early text formatting languages such as that used by the RUNOFF command developed in the early 1960s for the CTSS ( Compatible Time-Sharing System ) operating system: these formatting commands were derived from the commands used by typesetters to manually format documents.

MIT also had developed their own influential system, the Incompatible Timesharing System ( named in parody of the Compatible Time-Sharing System, developed at MIT for a modified IBM 7094 ).

# Original MAD, the compiler developed in 1959 at the University of Michigan for the IBM 704 and later the IBM 709 and IBM 7090 mainframe computers running the University of Michigan Executive System ( UMES ) and the Compatible Time-Sharing System ( CTSS ) operating systems.

Programs written in MAD included MAIL, RUNOFF, one of the first text processing systems, and several other utilities all under Compatible Time-Sharing System ( CTSS ).

Though the term dates from the 1990s, instant messaging predates the Internet, first appearing on multi-user operating systems like Compatible Time-Sharing System ( CTSS ) and Multiplexed Information and Computing Service ( Multics ) in the mid-1960s.

* The Compatible Time-Sharing System ( CTSS ), one of the first time-sharing operating systems, was developed at MIT's Project MAC using a 7094 with an extra bank of memory, among other modifications.

** CTSS ( MIT's Compatible Time-Sharing System for the IBM 7094 )

The Compatible Time-Sharing System, or the CTSS, was one of the first time-sharing operating systems ; it was developed at MIT's Computation Center.

The " Compatible " in the name refers to compatibility with the standard batch processing OS for the IBM 7094, the FORTRAN Monitor System ( FMS )

* F. J. Corbató, et al., The Compatible Time-Sharing System A Programmer's Guide ( MIT Press, 1963 ) ISBN 978-0-262-03008-3.

* Compatible Time-Sharing System ( 1961-1973 ): Fiftieth Anniversary Commemorative Overview

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ITS, the Incompatible Timesharing System ( named in comparison with the Compatible Time-Sharing System also in use at MIT ), was an early, revolutionary, and influential time-sharing operating system from MIT ; it was developed principally by the Artificial Intelligence Laboratory at MIT, with some help from Project MAC.

The name was chosen by Tom Knight as a joke on the name of the earliest MIT time-sharing operating system, the Compatible Time-Sharing System, which dated from the early 1960s.

The first timesharing system he was associated with was known as the MIT Compatible Time-Sharing System, an early version of which was demonstrated in 1961.

* F. J. Corbató ( editor ), The Compatible Time-Sharing System: A Programmer's Guide ( M. I. T.

Fernando Corbató reviews his early educational and naval experiences in the Eddy program during World War II, including the Compatible Time-Sharing System ( CTSS ), Project MAC, and Multics.