Good warning on the temperature variation - a larger pic and external xtal (or something like a 16F88 with internal crystal/more acpability than is needed?) might be required.
I don't suppose you could re-post the 12XXXX IC code could you (my email is mac65 <at> cam.ac.uk if you'd prefer to send it by mail) as the web-links above are broken.
Thanks,
--
Marko (working his way through the PIC instruction sets as bed-time reading!)
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