Mike Keitz wrote:

> On Thu, 7 Aug 1997 21:45:23 +0200 Agrico LTX <agrilltx@IAFRICA.COM>
> writes:
> >Hello everyone!!
> >
>
> >Main problem is that the configuration bits take two to three times
> >longer
> >than the program memory to erase.
> >I have just figured out that as long as I don't want to change the
> >config
> >bits, I don't have to wait for them to erase!! Silly me!! My picstart
>
> >is
>
>
> Be careful cutting back the erase time.  The PICSTART only checks at
> 5V
> if the chip is blank.  If not completely erased there will be some
> ghosts
> of the old program that will pass the 5V check but come back to haunt
> you
> at low voltage and/or high temperature (these conditions move the
> EPROM
> read margin toward "programmed") or just at random.  Do a few tests to
>
>

<good things snipped>

Agree. I find on my 16c54/55's that config bits gets mixed up (more
often than not) while the proggy is fully erased, so it is not always a
good practice to cut down on your erase time . Patience, and buy more
window PIC's (I use 3 at a time and still need more). Better still get
an ICE (my next step).

Quentin