By the way sampling the bus doesn't have to be that fast. The Carte Blanche does it a 50MHz.
Gentlemen, CB doesn't "sample" the bus at all. Instead it reacts to the 6502 accessing the bus. Just like say a memory card would. Totally different concept.
Video sync is a solvable problem. Either take the signal where it is available (IIe slot 7, etc.) or write a program that will allow the VGA card/software to sync.
True. Maybe even write a signature to the beginning of the video memory and sync to it. Once in sync it should stay in sync till a reset, so the signature doesn't need to stay there longer than a few milliseconds.
-Alex.