hi,
thanks for the theories

I HAVE SOME QUESTIONS:
1. if the scrool frequency is a fractional multiple of the refresh frequency (for e.g. if the refresh is 100 Hz, then the scroll frequency is say 50Hz or 25Hz i.e 1/2 or 1/4 of the refresh frequency), won't the movement of the text still be smooth only it will be slower which may suit very slow readers?
-provided it is not an irrational fraction e.g using refresh of 100Hz and scroll frequency of 63Hz.

2. u said for right to left scroll, refresh only by rows from down to up.

could u put more light on this?

thanks,

ehigie