>  And now the problem: the current from the pin of parallel port at logic
>level high seems to feed the entire PIC circuit, because it runs even
>without power. The voltage across the pull-up resistor is 1.2V, so I supose
>that the PIC chip is consumming 3.6 microAmps. Of course, I'm not using the
>SLEEP mode and there is not short-circuits in the PCB. May be that the
>current flows internally from the RA1 ping to Vcc??? It seems very strange,
>Any suggestions???

Sometimes, the parallel port gives amazing results...
What about this ?
 ___        ___
  !          !
  !         !-!    ____
 !-!        ! !   !
 ! !        !_!   !
 ! !         !____! RA1
  !  ___   !/     !
 ---!___!--!      !
           !\     !____
             !
            _!_
            ///

           |\_____/|
    ___    |[o] [o]|        ___     ___                 ___
   (o,o)   |   V   |       (o o)   (o o)               (o,o)
  <  .  >   |       |     (  V  ) (  V  )             <  .  >
----"-"----ooo---ooo--------m-m- /--m-m-----------------"-"-------

                          Luc Martin
                  luc@greco2.polytechnique.fr
        http://www.geocities.com/SiliconValley/Bay/2752