I have been having problems with a 16c74 in quite a complex circuit so I
have built a simple test circuit with a 20Mhz clock oscillator module to
clock in, a power supply and the reset held high.  I have made a simple test
program that should turn all the ports active high after configuring them as
outputs (correctly - it simulats ok on mplab!).  My problem seems to be that
the state of the ports keep changing, they are either high, low or high
impedance inputs and this changes each time I test them.  I think the
problem is in the pic because this also happens if the chip is blanked
completely by programming with a clear buffer after erasing.  The same
happens with another chip purchased on the same order.  Could the PIC be faulty?

Any help would be most appreciated
                                Tim

p.s.
Thanks for all the help on the IR and adb and a merry christmas to all.