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- # Z-Offset
-
- This LCD has a "Z-Offset" parameter, allowing to offset rows on
- the screen however we wish. This is handy because it allows us
- to scroll more efficiently. Instead of having to copy the LCD
- ram around at each linefeed (or instead of having to maintain
- an in-memory buffer), we can use this feature.
-
- The Z-Offset goes upwards, with wrapping. For example, if we
- have an 8 pixels high line at row 0 and if our offset is 8,
- that line will go up 8 pixels, wrapping itself to the bottom of
- the screen.
-
- The principle is this: The active line is always the bottom
- one. Therefore, when active row is 0, Z is FNTH+1, when row is
- 1, Z is (FNTH+1)*2, When row is 8, Z is 0. (cont.)
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