> > Tie the low 4 bits low.

> I respectfully disagree, you do not need to tie the extra four
> lines low.  I cannot find the document at the moment, but I
> am positive that the LCD handles the unconnected pins
> properly when in 4 bit mode.

Data pins have weak active PMOS pull-ups, just like those
that can be enabled on PIC I/O

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