> 4 row drivers are also the LCD data lines

After a little extra thought, that may not be necessary. For
once the fussiness of an LCD may actually be an advantage

As long as the conditions for a data write to the LCD don't
occur (by choosing which i/o lines are alternately assigned
to the LCD or k/b matrix and how the k/b is scanned), it should
be possible to avoid such a condition for any predicted key
press combination

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