Have you put PGM low?


At 11.15 2005.03.07 -0800, you wrote:
>I built a Tait-style programmer, which is pretty close to the 
>simplest possible way I can think of to program a PIC, without
>much (hardwarily) to go wrong.  It successfully programs a bunch
>of PIC samples I got (16F627/8), but will not program another bunch
>of samples (16F777, 16F870, etc).
>
>One thing that made me suspicious is that all the ones which work
>came from the same shipment of samples, and all the ones that fail
>came from another shipment.  Maybe I got a bad set of samples.  But
>after reordering the "bad" ones, I get the same failures on the new
>parts.
>
>As far as I can tell, the programmer's working fine.  It succeeds and
>fails the same whether driven by PICALL on Windows or my own programmer
>code on Unix.
>
>So... either there's something fundamentally weird about the programmer
>or I have two sets of bad samples.  I find the latter a little hard to
>believe, but before I go out and just buy a commercial programmer, what
>kind of quality history have you found with Microchip's samples?  Have
>they been really good, or would it be worth it for me to purchase a
>couple of PICs from another vendor and try them? 
>
>-- 
>Steve Willoughby     | "It is our choices... that show what we truly 
><steve@alchemy.com>  | are, far more than our abilities."
>                     |     --Albus Dumbledore, in Harry Potter and the 
>                     |            Chamber of Secrets, by J. K. Rowling
>
>-- 
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