hi,

forgot to say about:
- the speed of scroll must not exceed the refresh speed otherwise parts of text/image will disappear randomly. If you need faster scroll then just do it at two, three etc colums per time (skip technique);

In fact, scroll speed must be multiple to refresh speed. For example, if you refresh all dots 100 times per second (each 10ms) then scroll action must be done on 10ms base (each 10ms, 20ms, 30ms etc). By other words, it must be syncronized with refresh. This rule comes because the each step of scroll must be refreshed same times as other one. If this requirement is not observed then parts of text/image will have different bright and may disappear in the whole. As well, text/image may look as doubled one randomly.

Regards,
Oleg