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Updating modes
One of them updates the whole page (after clearing the page first, which results in a black flashing page), another one just updates the whole page but without clearing it first (so that you will se some ghosting effects).
Besides that, there are two more modes: one that is used for updating e.g. only a certain specified region of the screen which only contains two-colored (b/w) items (e.g. menu elements). (This should be the fastest one)
And - finally - there is one more mode which does the same as the third one does, except that it updates the specified region for greyscale items (4 bit color).
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