> That part looks fine.  I'm guessing you have a suitable acquisition
delay >(around 15us) between setting the channel in ADCON0 and setting
the GO bit?
=20
>One thing to check is that both sets of Vdd/Vss pins are definitely
>connected to their respective supplies, this is just the sort of odd
>behaviour that can occur if only one set of pins is powered.

At the moment I am initiating a conversion by hitting a button on the PC
and then looking at the result. The problem only occurs when I set the
A2D to use its internal Vref. If I set it to use an external Vref and
supply 5V and Gnd to the respective pins, I get the correct result.

R
Mark


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