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Encyclopedia > Enhanced Graphics Adapter

The Enhanced Graphics Adapter (EGA) is the IBM PC computer display standard specification located between CGA and VGA in terms of graphics performance (that is, colour and space resolution). Introduced in 1984 by IBM for its new PC-AT, EGA produced a display of 16 colors at a resolution of up to 640×350 pixels. The EGA card included a 16 kilobyte ROM to extend the system BIOS for additional graphics functions and included the Motorola MC6845 video address generator. IBM PC (IBM 5150) with keyboard and green screen monochrome monitor (IBM 5151), running MS-DOS 5. ... Various computer display standards or display modes have been used in the history of the personal computer. ... The Color Graphics Adapter (CGA), introduced in 1981, was IBMs first color graphics card, and the first color computer display standard for the IBM PC. The standard IBM CGA graphics card was equipped with 16 kilobytes of video memory. ... Video Graphics Array (VGA) is a computer display standard first marketed in 1987 by IBM. VGA belongs to a family of earlier IBM video standards and largely remains backward compatible with them. ... 1984 is a leap year starting on Sunday of the Gregorian calendar. ... International Business Machines Corporation (IBM, or colloquially, Big Blue) (NYSE: IBM) (incorporated June 15, 1911, in operation since 1888) is headquartered in Armonk, New York, USA. The company manufactures and sells computer hardware, software, and services. ... IBM PC (IBM 5150) with keyboard and green screen monochrome monitor (IBM 5151), running MS-DOS 5. ... Rom is also the name of a toy and comic book character Rom (Spaceknight). ... BIOS, in computing, stands for basic input/output system. ... Motorola (NYSE: MOT) (TYO: 6686) is a global communications company based in Schaumburg, Illinois, a Chicago suburb. ... The MC6845 was a video address generator first introduced by Motorola and used in the CGA and EGA video adapters, Amstrad CPC and BBC Micro. ...


Each of the 16 colours could be assigned a unique RGB colour code via a palette mechanism in the 640×350 high-resolution mode; EGA let you choose the displayed colours out of a total of 64 palette colours (two bits per pixel for red, green and blue). EGA also included full 16-colour versions of the CGA 640×200 and 320×200 graphics modes; only the 16 CGA/RGBI colours are available in these modes. The original CGA modes are also present, though EGA isn't 100% hardware compatible with CGA. EGA can drive an MDA monitor by a special setting of switches on the board; only 640×350 high-res is available in this mode. The RGB color model utilizes the additive model in which red, green, and blue light are combined in various ways to create other colors. ... An artists palette A palette is: A thin board that a painter holds and mixes colour pigments on. ... The Monochrome Display Adapter (MDA, also MDA card) introduced in 1981 was IBMs standard video display card and computer display standard for the PC. The MDA did not have any graphics mode of any kind; it only featured a single monochrome text mode (PC video mode 7), which could...


The base IBM EGA card came with 64 kilobytes of video memory installed, actually just enough to handle monochrome high-resolution graphics (but allowing for full colour in the 640×200 and 320×200 modes). Eventually, most EGA cards and clones would come with a full 256 KB of memory. A few third-party EGA clones (notably the ATI Technologies and Paradise boards) featured a range of extended graphics modes (e.g. 640×400, 640×480 and 720×540), as well as automatic monitor type detection, and sometimes also a special 400-line interlace mode for use on CGA monitors. A kilobyte (derived from the SI prefix kilo-) is a unit of information or computer storage equal to either 1024 or 1000 bytes. ... VRAM an acronym for Video RAM. Generally a term used in computers to describe RAM dedicated to the purpose of displaying bitmap graphics in raster graphics hardware. ... Something which is monochromatic has a single color. ... ATI Technologies Inc. ... Western Digital Corporation (NYSE: WDC) (often abbreviated to WD) is a manufacturer of a large proportion of the worlds hard disks, and has a long history in the electronics industry as an IC maker and a storage products company. ... Interlacing is a method of displaying images on a raster-scanned display device, such as a cathode ray tube (CRT). ...


The EGA standard was made obsolete by the introduction of VGA by IBM in April 1987 with the PS/2 computer line. Video Graphics Array (VGA) is a computer display standard first marketed in 1987 by IBM. VGA belongs to a family of earlier IBM video standards and largely remains backward compatible with them. ... 1987 is a common year starting on Thursday of the Gregorian calendar. ... It has been suggested that this article or section be merged with PS2. ...


See also Professional Graphics Controller, a much more powerful graphics adapter with an equally short marketing life. Professional Graphics Controller was an IBM XT graphics card manufactured by IBM. It was very advanced, providing both 2D and 3D graphics accelerator for CAD applications. ...


References

  • Mueller, Scott (1992) Upgrading and Repairing PCs, Second Edition, Que Books, ISBN 0-88022-856-3

  Results from FactBites:
 
What is EGA? 1984 IBM Enhanced Graphics Adapter Display Card (211 words)
It was a nice graphics card at the time, but it couldn't deliver the vast array of colors we all like today, so it is thus forgotten.
One new feature on the EGA adapter was the memory expansion board.
One good thing, though, was that most aftermarket EGA cards came equipped with the full 256 KB of memory.
Enhanced Graphics Adapter - Wikipedia, the free encyclopedia (362 words)
The Enhanced Graphics Adapter (EGA) is the IBM PC computer display standard specification located between CGA and VGA in terms of graphics performance (that is, colour and space resolution).
EGA can drive an MDA monitor by a special setting of switches on the board; only 640×350 high-res is available in this mode.
The EGA standard was made obsolete by the introduction of VGA by IBM in April 1987 with the PS/2 computer line.
  More results at FactBites »

 
 

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