Tony Nixon wrote:

> >From the data book....
> Port latch = 1 and TRISB = 1 enables weak pullup if RBPU = 0

> You mention that your port latch = 0.

  Sorry Tony, wrong data book!  You are referring to AVR devices, we're
talking PICs.  Weak pull-up is enabled when RBPU is low and individual
TRIS line is high.  The port latch status is irrelevant.

  James, the port B pullups are in the order of 100k; for IÓC you need
4k7.  Use resistors.
-- 
  Cheers,
        Paul B.