Source : Free On-Line Dictionary of Computing

eXtended Graphics Array
     
         (XGA) An {IBM} {display standard} introduced in
        1990.
     
        XGA supports a {resolution} of 1024 x 768 {pixels} with a
        {palette} of 256 colours, or 640 x 480 with {high colour} (16
        {bits per pixel}).
     
        XGA-2 added 1024 x 768 support for high colour and higher
        refresh rates, improved performance, and supports 1360 x 1024
        in 16 colours.
     
        XGA is probably not the same as {8514-A}.
     
        See also {VESA}'s {EVGA} released at a similar time.
     
        (1999-08-01)