Great, no plans for I2C for this project Thanks for all your help too.

Oh, and before I forget.... This:

For old time sake!!

Still waiting for a sine wave version in that old odometer thread.
I used a pseudo sine lookup table to get the next vertical offset when I did it on my LED scroller.
Code:
LOOKUP si,[0,0,1,1,2,2,2,3,3,4,4,3,3,2,2,2,1,1,0,0],offset
Anyways, the rolling clock gets to stay it isn't blocking execution.