XGA

XGA

XGA, the Extended Graphics Array, is an IBM display standard introduced in 1990. Today, it is the most common appellation of the 1024 × 768 pixels display resolution, but the official definition is broader than that. It was not a new and improved replacement for Super VGA, but rather became one particular subset of the broad range of capabilities covered under the "Super VGA" umbrella.

The initial version of XGA expanded upon IBM's VGA, adding support for two resolutions:
* 800 × 600 pixels with high color (16 bits per pixel, i.e. 65,536 colors).
* 1024 × 768 pixels with a palette of 256 colors (8 bits per pixel)

Like its predecessor (the IBM 8514), XGA offered fixed function hardware acceleration to offload processing of 2D drawing tasks. XGA and 8514 could offload line-draw, bitmap-copy (bitblt), and color-fill operations from the host CPU. XGA's acceleration was faster than 8514's, and more comprehensive in that it supported more drawing primitives and XGA's 16 bits per pixel (65,536 color) display-mode.

XGA-2 added true color mode for 640×480, 1024×768 support for high color and higher refresh rates, and improved accelerator performance. All XGA modes have a 4:3 aspect ratio rounded to 8 pixels.

XGA should not be confused with VESA's EVGA (Extended Video Graphics Array) which was released at a similar time.

Clone hardware

XGA hardware was not cloned as extensively as VGA hardware. Nevertheless, at least one graphics company made several XGA-compatible chips, the IIT AGX.

Comparison chart

See also

* Wide XGA

References


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  • XGA — (4:3) im Vergleich mit anderen Formaten. Extended Graphics Array (Abkürzung XGA) bezeichnet: einerseits einen Computergrafik Standard (VESA 2.0), der bestimmte Kombinationen von Bildauflösung und Farbanzahl (Bittiefe) sowie Wiederholfrequenz… …   Deutsch Wikipedia

  • XGA-2 — XGA (4:3) im Vergleich mit anderen Formaten. Extended Graphics Array (Abkürzung XGA) bezeichnet: einerseits einen Computergrafik Standard (VESA 2.0), der bestimmte Kombinationen von Bildauflösung und Farbanzahl (Bittiefe) sowie Wiederholfrequenz… …   Deutsch Wikipedia

  • XGA+ — stands for eXtended Graphics Array Plus and is a computer display standard. XGA+ is often used on 17 inch desktop CRT monitors. XGA+ is usually understood to refer to the 1152×864 resolution with an aspect ratio of 4:3. As LCD screens are getting …   Wikipedia

  • XGA — (англ. Extended Graphics Array)  стандарт мониторов и видеоадаптеров, введённый IBM в 1990 году, поддерживающий более высокое, по сравнению с VGA, разрешение  1024×768, 256 цветов …   Википедия

  • XGA — (siglas en inglés de Extended Graphics Array), es un estándar de visualización de gráficos para ordenadores creada por IBM en 1990. El estándar XGA soporta una resolución máxima de 1024x768 pixeles, con una paleta gráfica de 256 colores, o… …   Enciclopedia Universal

  • XGA —   [Abk. für Extended Graphics Array, dt. »erweiterter Grafikbereich«], ein Grafikstandard, der 1990 von IBM als Ersatz für den älteren Standard 8514/A definiert wurde. XGA stellt den Bildschirm mit 640 × 480 Punkten in High Color (16 bit, d. h.… …   Universal-Lexikon

  • XGA — er i IT terminologi en forkortelse for eXtended Graphic Adaptor, som er en skærmadaptor med en opløsning på 1.024x768 billedpunkter. Standarden er en tidlig IBM standard for skærmmodes …   Danske encyklopædi

  • XGA — (Extended Graphics Array) n. (Computers) standard for color graphics displays which enables 65000 colors (developed by IBM) …   English contemporary dictionary

  • XGA — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. XGA, sigle composé des trois lettres X, G et A, peut faire référence à : Extended Graphics Array, Gaoua au Burkina Faso, selon la liste des codes… …   Wikipédia en Français

  • XGA — Усовершенствованный графический адаптер …   Краткий толковый словарь по полиграфии

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