The A revisions of those chips have a much different programming
algorithm than the older versions. Your programmer needs to know this,
or it will fail.

Josh
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Eduardo Garcia wrote:
>     Please, anybody knows the diferences between PIC16F87X and PIC16F87XA?
>     I buy the new version (XA) and the ISP don't work fine.
>     I don't found in MICROCHIP application notes (39591a.pdf) detailed
> information about it.

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