Simple VGA for Ben Eater's 6502 - Increasing the resolution

I wanted to increase the resolution of the Simple VGA circuit. The first step is doubling the horizontal resolution, so I'm going to talk through how the timings work, what we can do to double the resolution, and show how the circuit works after those changes. The project source etc is on github - I'll update it soon with the new schematics, code, etc: https://github.com/gfoot/simplevga6502