James Cameron wrote:

> If it wasn't for your testing with the PICStart Plus I would have said
> perhaps the 16F84 is different to the 16C84 in that the code protect
> bits are inverted.

  And everyone keeps getting this mixed up.  It is not the Code Protect,
but the Power Up Timer Enable bit that is inverted between C84 and F84.
One must tend to on principle ask: "Why?", but the fact is that for most
applications the difference will never be noticed.
--
  Cheers,
        Paul B.