Motorola MVME2401-1 Installation And Use Manual page 167

XGA
Y Signal
http://www.mcg.mot.com/literature
EXtended Graphics Array. An improved IBM VGA monitor
standard that provides at least 256 simultaneous colors and a screen
resolution of 1024 x 768 pixels.
Luminance. This determines the brightness of each spot (pixel) on a
CRT screen either color or B/W systems, but not the color.
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