Cygwin consists of two parts: a dynamic-link library ( DLL ) as an API compatibility layer providing a substantial part of the POSIX API functionality, and an extensive collection of software tools and applications that provide a Unix-like look and feel.

Support for compiling programs that do not require the POSIX compatibility layer provided by the Cygwin DLL used to be included in the default gcc, but is now provided by cross compilers contributed by the MinGW-w64 project.

Winelib, a part of the Wine project, is the inverse of Cygwin-it is a free and open source compatibility layer for Unix-like operating systems on the x86 or x86-64 architecture that can allow programs written for Microsoft Windows to run on Unix-like operating systems.

The following are not officially certified as POSIX compatible, but they conform in large part to the standards by implementing POSIX support via some sort of compatibility feature, usually translation libraries, or a layer atop the kernel.

Wine is a compatibility layer.

Its operating system, code named Mica, was to embody the next generation of design principles and have a compatibility layer for Unix and VMS.

HITheme was introduced in Mac OS X v10. 3, and Appearance Manager is a compatibility layer on top of HITheme since that version.

Shareaza can be run under Linux using the Wine compatibility layer.

* bash — A Unix shell commonly run on Linux and other modern Unix-like systems, as well as on Windows via the Cygwin POSIX compatibility layer.

The Wine project is an attempt to provide a Win32 API compatibility layer for Unix-like platforms.

One can install the Cygwin or MSYS system on top of Windows to provide a Unix-like compatibility layer, though, allowing configure scripts to run.

The addition of an abstraction layer between the x86 instruction stream and the hardware means that the hardware architecture can change without breaking compatibility, just by modifying the CMS.

A MAC layer is not required in full-duplex point-to-point communication, but address fields are included in some point-to-point protocols for compatibility reasons.

iTunes was known to run passably well in Linux on x86-based computers using the Wine compatibility layer ; however, as of 13 December 2011, with the latest releases of iTunes & Wine, this is no longer the case.

Unlike Apple's A / UX, Amiga Unix contained no compatibility layer to allow AmigaOS applications to run under Unix.

By including a compatibility layer, A / UX could run Macintosh System 7. 0. 1, Unix, and " hybrid " applications.

While the term usually refers to source code, it can also apply to executable code that no longer runs on a later version of a system, or requires a compatibility layer to do so.

In the 64-bit versions of those OS's the 32 bit applications are being ran in a compatibility layer in the kernel, and the 16 bit layer would need rewraped, therefore Microsoft removed the feature.

The latter is assisted by including parts from the Wine compatibility layer for Unix-like operating systems, but other functionality is implemented by the developers themselves.

The POSIX layer runs on top of Windows, sacrificing performance where necessary for compatibility.

Unlike Cygwin, MinGW does not require a compatibility layer DLL and thus programs do not need to be distributed with source code.

In such cases, the older API can still be supported by a thin compatibility layer on top of the newer code.

The Open Transport APIs are still present and usable in a limited form as a compatibility layer for older applications, but are deprecated in the OS X 10. 4 and later SDKs.

A special version of NewDos / 80, ( an improved TRS-DOS compatible Disk operating system ) was used to support these disk capacities when using the TRS-80 compatibility mode.

The 7800's compatibility with the Atari 2600 is made possible by including many of the same chips used in the Atari 2600.

It includes a newer DOS, version 3. 1, replaces the MOS Technology CIA interface chip, of which only a few features were used by the 1571 DOS, with a very much simplified chip called 5710, and has some compatibility issues with the stand-alone drive.

Compatibility Group codes are used to indicate storage compatibility for HC / D Class 1 ( explosive ) materials.

Letters are used to designate 13 compatibility groups as follows.

To facilitate cross platform compatibility, it defined a minimal set of common file attributes ( directory or ordinary file and time of recording ) and name attributes ( name, extension, and version ), and used a separate system use area where future optional extensions for each file may be specified.

Kermit software has been used for tasks ranging from simple student assignments to solving compatibility problems aboard the International Space Station.

1-2-3 was used to test general application compatibility, with Microsoft Flight Simulator being used to test graphics compatibility.

More extensive microcoding has also been used to allow small and simple microarchitectures to emulate more powerful architectures with wider word length, more execution units and so on ; a relatively simple way to achieve software compatibility between different products in a processor family.

The early VAXes provided a PDP-11 compatibility mode under which much existing software could be immediately used, in parallel with newer 32-bit software.

This first implementation of the Pentium used a traditional 5 Volt power supply ( descended from the usual TTL logic compatibility requirements ).

The television commercials used the slogan " The Future Is Better Than You Expected ", featuring the first three Power Macintosh computers to showcase special features such as networking and MS-DOS compatibility.

Block conversion of the entire affected frequency band onto UHF, while less common, was used by some models to provide full VCR compatibility and the ability to drive multiple TV sets, albeit with a somewhat nonstandard channel numbering scheme.

Japan was the first country to adopt 3G technologies, and since they had not used GSM previously they had no need to build GSM compatibility into their handsets and their 3G handsets were smaller than those available elsewhere.

The term is not synonymous with IBM PC compatibility as this implies a multitude of other computer hardware ; embedded systems as well as general-purpose computers used x86 chips before the PC-compatible market started, some of them before the IBM PC itself.

Although most x86 processors used in new personal computers and servers have 64-bit capabilities, to avoid compatibility problems with older computers or systems, the term x86-64 ( or x64 ) is often used to denote 64-bit software, with the term x86 implying only 32-bit.

ATRAC3plus was not used in order to retain backwards compatibility with earlier NetMD players.

The properties of the fusion zone depend primarily on the filler metal used, and its compatibility with the base materials.

Despite advances of computer technology, all current IBM PC compatibles remain very much compatible with the original IBM PC computers, although most of the components implement the compatibility in special backward compatibility modes used only during a system boot.