You would normally store the bit-map data in memory so that doing a horizontal scroll is just a matter of shifting an index. To translate this bit map into values suitable for shift out to the shift registers you need to write a subroutine that does this translation. I doubt if it is 'impossible' - it just requires a little thought. You'll probably need to do a lot of bit shifting etc, but the 8051 is ideally suited to this sort of stuff.


Again, divide your problem into little 'blocks' - and solve each of these 'blocks', before you know it, the problem is solved.