thank you for your reply.

i will make pocket ball game.

if is push the button, on LCD, the ball rolls across display.

when it faces the wall, it will reflect at the same angle with its incoming angle(or incident angle).

well....maybe it will not be a sufficient illustration....

but the point is the shifting with angle....

how could it be implemented for the case of 5 line LCD?

PS> another question....

for 2 line LCD, second line address starts from 40h.

then, for 5 line LCD, what is the start addess of third line?