Ben,

 This may seem obvious, but are you putting them in the programmer
 in the correct orientation?   I know I've put parts in backwards
 before and swore I had them in correctly.  Just a thought.

                                          Regards,

                                            Jim


On Sun, 08 July 2001, ben wrote:

>
> Hi all,
>
> Can anyone think of an explanation for this??
> My NOPPP programmer will not program 16F877s yet I know the design has been
> used to do so by others.
> I've programmed 16F84(A)s okay so I now the programmer works. I've checked
> and double checked the 18-pin to 40-pin adapter and all the wires are going
> to the correct pins.
> When I test the voltages with the chip out of the circuit I get a nice 5v
> supply.
> When I put the chip in place the power supply shuts down. The power supply
> can do 1A so I don't think it's just that the supply needed is higher than a
> 16F84 (which I've succesfully programmed!).
> The chips are brand new. Is there anything that would cause a 16F877 to short
> out.  I've tested two chips and they are both the same...
>
> Ben
>
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jim@jpes.com

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