Il 04-Gen-98, Andy Kunz scrisse:


>> 1) How can i identify if a Pic or any other known chip
>>    is not correctly placed in the zif socket
>>    (i.e. reversed or completly not in the socket)?

>The data returned will be all zeros instead of (all ones || a mixture of
>zeros and ones).

>Try it some time - put a PIC in backwards and read it.

:-) you surely know that a pic need an high voltage on Vpp to read out data...
 if is applied on the wrong pin... kabooom! :-) On eeproms, Vpp
 is also applied on A9 to read out the electronic signature.... if
 A9 is not where it's supposed to be (maybe because the chip
 is one pin shifted)... :-(


--

   - *Alex* -

      (azummo@ita.flashnet.it)