Just a further note to Adam Porter in addition to my response on the why and wherefore above, I discovered that the wierd behaviour with not being able to access the status port appears to be specific to the combination of Debian Sarge with the particular PC I was using. The difficulty does not appear on other machines with Sarge loaded and running and funnier still, it's not failed hardware because when I prevent parport from loading at all, my custom module works just fine! Hmmm, very odd indeed! Maybe a quirky peripheral chip not in common use. Anyway, /etc/modprobe.conf/local seems to be a good solution.
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