Hi... i've a Pic hooked to a zif socket and i use it
 to program some chips.. sometimes i need
 to have about 12-18 volts on a pin of
 the zif socket which is also connected to the PIC.

 What's the better way to protect the PIC?

 It's better to set the pic pin as input, output high
 or output low? What about the resistor value?

 The pic is a 16C5x, so , AFAIK, the current should be
 limited to 10/15mA, but, even with the limiting resistor,
 the PIC should still be able to drive a TTL input...


--

   - *Alex* -

  http://freepage.logicom.it/azummo/