I have had new chips that report as being non blank. I think it is just
the way they are produced. They program fine after doing a bulk erase.

Maybe its a cheap way of testing all bits. Start off all 1's, then
program the chip to all 0's. Report a failure if the chip does not read
all 0's.

regards

Tony

cdb wrote:

>I recently ordered 2, 16f876's 20MHz from a supplier  here in
>Australia.
>
>Both failed the blank check, reporting zeros when read, as though
>code protection had been set AND both have a PortB:1 failure.
>
>The production code is week 13/03.
>
>I don't normally deal with this supplier, but they were the cheapest
>in Australia, I needed two quickly, and these chips are supposed to
>be unused.
>
>I just want to check that I'm not getting aerated   over nothing. I'm
>sure all chips I have purchased  previously pass the blank check and
>therefore report FF as the contents.
>
>The PortB failure is going to be difficult to convince I suspect.
>
>Am I having a blond moment?
>
>Colin
>--
>cdb, cdb@barnard.name on 22/03/2002
>
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