In the graphics modes, the display is made up of an array of boxes, each box being off or on. Each box is controlled by one or more bits in display memory. Resolution Resolution, the number of boxes on the display, is an issue where people tend to go overboard in their design. Higher resolution means more memory to modify, more address lines to multiplex, and just more headaches in general. 64 x 64 seems like a very low resolution, but it is adequate for many 6.111 projects.
High resolution is most useful for line drawing.
It is difficult to calculate and draw more than a few lines in the retrace periods when display memory can be accessed. A fast moving, low resolution, color display probably has the greatest aesthetic appeal. Color Color is available in a variety of ways with the 6847. One bit in memory controls each box's state. This complicates the bit manipulation of display memory, but not excessively.