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some inline gun CRT computer monitors used the delta gun phosphor pattern until the end of the CRT (dots could resolve fine text better), and the first inline gun CRT used in the GE portacolor used the delta gun pattern. Part of the reason the first portacolors looked low rez is that they literally cut the center 10" out of shadow mask for a 20" CRT leaving the screen with a fraction of the dot triad count it ought to have had...
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