enpassant wrote:
> I read in a book somewhere that unused microchip pins should be
> grounded to prevent them from "floating".

I've seen that to.  Unused inputs I thought it said.  Outputs don't
float, but are driven.

> In the case of the PIC (16F84) should unused I/O pins and any other
> unused pins be tied to ground???

On the PIC 16F84, the only possible unused pins are I/O pins.  Set them
as outputs, and you will not need to attach them to anything.

The problem with grounding them is that your software may attempt to
raise them to a high level, in which case current may flow.

--
James Cameron                                      (cameron@stl.dec.com)

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