AVR-Chat

On Nov 1, 2007 3:19 PM,  <enkitec@gmail.com> wrote:
>
>         I have fried a couple AVRs using a LPT port SPI programmer.
>         The problem went away when I first connect a ground wire between the
> PC and the hardware being programmed.
>         The SPI cable will be inserted only after the ground is connected.

It should be obvious, but the ground is a required connection to the
target system.