Writting device drivers

[Jeff Clement <jclement_(_at_)_spots_(_dot_)_ab_(_dot_)_ca>]

Is there a few simple examples or getting started information to writting kernel 
modules in OpenBSD?  I want a driver for my sound card and figure this would be
an interesting way to learn :)  I also want to see if I can make the ATAPI floppy
stuff work with a clik! drive.

What kind of books should I look into for information?

Thanks,
 Jeff Clement

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