Strange. Test:

1) Without putting the Chip in any socket, use a multimeter and measure=
 resistance between Vss and Vdd.

2)Put the chip in the socket and without powering up and disconnected from=
 computer measure again.

Note: theese chips have double supply pins, you hve not by chance crossed=
 them?

/Morgan


Tack f=F6r ditt meddelande 14:40 2001-07-08 enligt nedan:
>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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