Maybe someone wants to tak to Mr. Chung if his 2002 paper "The Design of the NetBSD I/O Subsystems" at http://home.pusan.ac.kr/~swchung/usenix/papers/netbsd-io-2002.pdf can be used as base for a NetBSD kernel/developer's guide? Sounds like a good start. (No, not me :-) - Hubert