Geriye uyumluluk: Revizyonlar arasındaki fark

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==Açıklama==
Geriye uyumluluk iki bileşenden birinin özelliği olmaktansa ikisi arasındaki bir ilişkidir. Daha genel olarak, yeni bir bilşen eğer eski bileşenin tüm fonksiyonel özelliklerine sahipse geriye uyumludur.
 
''Geriye'' uyumluluk, yeni bileşenin eskisiyle arasında doğrudan geçmişle ilgili bağını belirten uyumluluğun özel bir durumudur. Eğer bu özel ilişki bulunmuyorsa "geriye" uyumluluk yoktur, sadece "uyumluluk"(birbirinden bağımsız geliştirilmiş bileşenler ve ürünler arası [[Birlikte işlerlik|birlikte işlerlik]]) söz konusudur.
 
Veri, yorumlayıcı olmadığı zaman işe yaramaz, bu nedenle uyumluluk kavramı döküman dosyları için geçerli değidir. Örneğin, v2 programıyla üretilmiş dosyalar v1 ile de çalışabilmeli, v1 ile kaydedilen dosyalar v2 de okunabilmelidir aksi takdirde geriye uyumlu değildir.
 
If a newer software version cannot save files that can be read by the older version, it is not backward compatible with the older version, although it may provide an irreversible [[upgrade]] capability for the old files. This situation has often been used strategically by software vendors to force customers to purchase upgrades since, over time, the number of data files usable by an old version diminishes at a rate proportional to the number of other customers that have upgraded (assuming that all customers generate files at the same the average rate.)
 
 
 
Levels of compatibility vary. In software, ''[[Binary code compatibility|binary compatibility]]'' and ''[[Source code compatibility|source compatibility]]'' are distinguishable. Binary compatibility means that programs can work correctly with the new version of this library without requiring [[compiler|recompilation]]. Source compatibility requires recompilation but no changes to the source code.
 
Many platforms rely on [[Emulator|emulation]], the simulation of an older platform in software, to achieve backward compatibility.
 
==Examples==
* The [[NTSC]] color broadcast system was engineered by [[RCA]] to be backward compatible with [[black-and-white]] NTSC television sets.
* Most [[Blu-ray Disc|Blu-ray disc drives]] are able to play standard [[CD]] and [[DVD]] discs and most [[DVD|DVD drives]] are able to play standard [[CD]] discs.
* Numerous video game consoles are backward compatible and are able to play the games created for predecessor consoles:
** The [[Atari 7800]] is backward compatible with almost all [[Atari 2600]] games.
** The [[Game Boy Advance]] line (except the [[Game Boy Micro]]) is backward compatible with previous [[Game Boy line|Game Boy systems]], meaning all [[Game Boy]] and [[Game Boy Color]] titles are playable on this system.
** The [[Nintendo DS]] and the [[Nintendo DS Lite]] are backward compatible with all Game Boy Advance games.
** The [[Nintendo 3DS]] is backward compatible with the [[Nintendo DS]] and [[Nintendo DSi]] software.
** The [[PlayStation 2]] is backward compatible with most of the original [[PlayStation]] library. Additionally, the initial [[PlayStation 3]] model is backward compatible with most PlayStation and PlayStation 2 games. This is provided by the inclusion of the original [[Emotion Engine]] chip that is built inside the PS2.
** The [[Xbox 360]] is backward compatible with some [[Xbox]] games via software emulation.
** The [[Wii]] is backward compatible with all games from the previous [[Nintendo]] system, the [[Nintendo GameCube]], due to it being based on the [[PowerPC]], the same base as the latter.
* [[Microsoft Windows]] contains application compatibility [[shim (computing)|shims]] to make the platform compatible with most software from earlier 32-bit and 16-bit versions (e.g. ''[[Civilization (computer game)|Civilization]]'' (circa 1991, designed for [[Windows 3.0]]) running on Windows Vista).
* [[Microsoft Word]] 2000 was backward compatible with Word 97 because it could read and write files in Word 97 format, with the understanding that features unique to Word 2000 would not appear in Word 97.
* Several computer [[operating system]]s have various methods of running software originally designed for older versions or other OSs:
** [[Windows NT]] and successors have various subsystems to run legacy applications. [[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.
** With the introduction of Windows 7 (Business, Ultimate, or Enterprise editions), Windows XP Mode enables full compatibility with older programs supported under Windows XP via Microsoft Virtual PC.
* The modern [[Nikon F Mount]] SLR camera lenses from the late 1970s - present (its design dates back to 1959) can function on the newer Nikon DSLR cameras with some limitations.
* [[PCI Express]] 2.0 is backward compatible with PCI Express 1.1.
* The [[IBM 7080]] [[transistor]]ized computer was backward compatible with all models of the [[IBM 705]] [[vacuum tube]] computer.
 
 
[[ar:توافقية مع إصدارات أقدم]]
[[cs:Zpětná kompatibilita]]
[[en:Backward compatibility]]
[[es:Retrocompatibilidad]]
[[fa:سازگاری عقبرو]]
[[fr:Compatibilité ascendante et descendante]]
[[ko:하위 호환성]]
[[io:Retro konciliebla]]
[[it:Retrocompatibilità]]
[[nl:Achterwaartse compatibiliteit]]
[[ja:後方互換]]
[[pl:Kompatybilność wsteczna]]
[[pt:Compatibilidade reversa]]
[[ru:Обратная совместимость]]
[[simple:Backward compatibility]]
[[sk:Spätná kompatibilita]]
[[sv:Bakåtkompatibilitet]]
[[zh:向下兼容]]
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