This is the new diagram for the Video Controller. It is an 8-bit true-color 80x30 character generator, with 256 stored characters in the Text PROM and 256 colors formed from the color memory (each character can have a color, or easily extended to two colors FG and BG by adding an additional Color Memory bank and a NAND from the mux).
The VGA Screen Resolution is 640x480 with each character being 8x16.
See the monochrome version for some more infor about the vsync and how the character prom and such works.
See this pdf file for detailed operations of vga timing and simple vga circuits.
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