> I implemented the code Olin sent, however it did not affect the outcome
of the bulk
> erase.  It seems as if all the sequence is doing is trying to write
0x3fff to the config
> register.  The bulk erase doesn't happen.  I can program and read the ID
registers so I'm
> sure my data communication routines are fine.  I'm rather stumped as to
why the bulk
> erase doesn't happen.

The source I sent is the actual operational source for my programmer,
which can definitely erase a code protected 16F877.  Are the Vpp and Vdd
voltages within spec.  Note that the allowable Vdd range is narrower for
erasing and programming the chip than for verifying it.  If I remember
right, Vpp needs to be 13V +-.5 and Vdd 5V +-.5.  I would want to be
closer than +-.5V.


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