The code needs tidying and commenting and debugging before I can share it (and before I forget how it works). I have got colour out of 3 monitors so far so it is looking good. This is using NTSC timings, I will try PAL another day. Resolution is 640x200 (or about 700x220 with overscan), but practically the Arduino won't be fast enough or have the ram to make use of all that. I may aim for a 160x200 mode.
Grayscale, colour bars and dot crawl 
