* 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 ).

With ASP Version 3 the name was changed to Asymmetric Multiprocessor and support was added for OS / VS2 ( SVS ).

* Auxiliary Storage Pool, a group of disk drives in the IBM i ( aka OS / 400 ) operating system

Three emulators of the machine exist, ElectrEm for Windows / Linux / Mac OS X, Elkulator for Windows / DOS and the Multi-system emulator MESS.

The rise of TCP / IP during the 1990s led to a re-implementation of most of these types of support on that protocol, and AppleTalk became unsupported as of the release of Mac OS X v10. 6 in 2009.

| ATA / ATAPI-8 || ATA-8 || — || || Hybrid drive featuring non-volatile cache to speed up critical OS files || In progress

( Around 1990, OS / 2 came out with " preemptive multitasking " of DOS, an alternative to DESQview for multi-node BBS.

By 1995, many of the DOS-based BBSes had begun switching to modern multitasking operating systems, such as OS / 2, Windows 95, and Linux.

JPI first launched a MS-DOS compiler named JPI Modula-2, that later became TopSpeed Modula-2, and followed up with TopSpeed C, TopSpeed C ++ and TopSpeed Pascal compilers for both the MS-DOS and OS / 2 operating systems.

MS-DOS and Win16 subsystems ( only on i386 ) can run some applications for those platforms, and it has an OS / 2 subsystem for running CLI OS / 2 applications.

IBM contributed its Common User Access model from OS / 2's Workplace Shell.

OS / 390 or its successor, z / OS, display dates in yy. ddd format for most operations.

* On systems that support one-button mice, context menus are typically opened by pressing and holding the primary mouse button ( this works on the icons in the Dock on Mac OS X ) or by pressing a keyboard / mouse button combination ( e. g. Ctrl-mouse click in Mac OS ).

Debian GNU / Linux, which includes the GNU OS tools and Linux kernel, is a popular and influential Linux distribution.

* Open Dylan-Host of two open source, optimizing Dylan compilers targeting Unix / Linux, Mac OS X, and Microsoft Windows

EFI booting has been supported in only Microsoft Windows versions supporting GPT, the Linux kernel 2. 6. 1 and later, and Mac OS X on Intel-based Macs.

; Macintosh Common Lisp: Version 5. 2 for Apple Macintosh computers with a PowerPC processor running Mac OS X is open source.

* Installable File System ( IFS ) – a filesystem API for IBM OS / 2 and Microsoft Windows NT

Originally developed on IRIX, Freeciv has been ported to many different operating systems: it is distributed with many Linux distributions, offers installers for Microsoft Windows, and has been known to run on Mac OS X, Solaris, Ultrix, QNX, OS / 2, Cygwin, AmigaOS, RISC OS, Maemo, ZETA, SkyOS and various BSDs.

This allowed the game to be ported to different platforms such as Linux and OS / 2 ( EComStation ).

Modern Windows operating system versions are based on the newer Windows NT kernel that was originally intended for OS / 2.

Version 2. 03, and later 3. 0, faced challenges from Apple over its overlapping windows and other features Apple charged mimicked the ostensibly copyrighted " look and feel " of its operating system and " embodie and generated a copy of the Macintosh " in its OS.

OS / 2 logo

During the mid to late 1980s, Microsoft and IBM had cooperatively been developing OS / 2 as a successor to DOS.

OS / 2 would take full advantage of the aforementioned protected mode of the Intel 80286 processor and up to 16 MB of memory.

A GUI, called the Presentation Manager ( PM ), was not available with OS / 2 until version 1. 1, released in 1988.

Microsoft wanted to further develop Windows, while IBM desired for future work to be based on OS / 2.

In an attempt to resolve this tension, IBM and Microsoft agreed that IBM would develop OS / 2 2. 0, to replace OS / 2 1. 3 and Windows 3. 0, while Microsoft would develop a new operating system, OS / 2 3. 0, to later succeed OS / 2 2. 0.

The addition of the Plus 1 added a number of new * FX and OSBYTE calls that allowed the OS to read the values from the Analogue and parallel interfaces.

* 1704 1 August ( NS ): ( 21 July ( OS )) – During the War of the Spanish Succession, and when returning from a failed expedition to Barcelona, an Anglo-Dutch fleet, under the command of Sir George Rooke, chief commander of the Alliance Navy, began a new siege ( the eleventh siege of the town ).

After an interim 1. 3 version to fix up many remaining problems with the 1. x series, IBM released OS / 2 version 2. 0 in 1992.

In response to the impending release of OS / 2 2. 0, Microsoft developed Windows 3. 1, which included several minor improvements to Windows 3. 0 ( such as display of TrueType scalable fonts, developed jointly with Apple ), but primarily consisted of bugfixes and multimedia support.

While OS / 2 continued to run Windows 3. 1 applications, it lacked support for anything but the Win32s subset of Win32 API ( see above ).

OSR2, OSR2. 1, and OSR2. 5 were not released to the general public ; rather, they were available only to OEMs that would preload the OS onto computers.

The same limitations affected Digital Research's FlexOS 286 version 1. 0, a derivation of Concurrent DOS 286, developed in 1986, introduced in January 1987, and later adopted by IBM for their IBM 4690 OS.

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 ).

OS / VS2 release 1 was an upgrade of OS / 360 MVT that retained most of the original code and, like MVT, were mainly written in Assembler.

Several operating systems have since been constructed using this method, known as co-location, among them Lites, MkLinux, OSF / 1 and NeXTSTEP / OPENSTEP / Mac OS X.

Apple purchased NeXT on December 20, 1996 for $ 429 million and 1. 5 million shares of Apple stock, and much of the current OS X and iOS operating systems are built on the OPENSTEP foundation.

A server version of the new operating system was released as Mac OS X Server 1. 0 in 1999, and the first consumer version, Mac OS X 10. 0, in 2001.

OS / 2 1. 0 was announced in April 1987 and released in December.