64 bytes per scan line X 200 scan lines = 12,800 bytes.

1,000,000 / 12,800 = 78.125

i.e. frame rate = 78 frames per second could be updated with that speed.

I am sure 78 frames per second are not really desirable, so the resolution could actually be doubled per scan line:

128 bytes per scan line X 200 scan lines = 25,600

1,000,000 / 25,600 = 39 frames per second.