[Coco] CoCo RGB video timing and levels

[Theodore Evans (Alex)]

 From memory, the CoCo uses a 70ns (or 14.28MHz) pixel clock when using 
a 640x200 resolution.  As far as memory bandwidth is concerned.  The 
GIME needs to read from memory once for every 8 pixels (2 bits per 
pixel, 16 bits per read) which works out to one read for every cycle at 
1.78 MHz.

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Theodore (Alex) Evans | 2B v ~2B = ?