V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

XGA
       eXtended Graphics Adapter  [1024x768] (IBM, PS/2)


The Free On-line Dictionary of Computing (30 December 2018):

eXtended Graphics Array
XGA
XGA-2

    (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)