Have you tried to boot with a very recent -current kernel?  See if you can
find one with John's ADB code in it (i.e. MRG_ADB is disabled).  There
should be a couple on ftp.netbsd.org, but I don't know if any are recent
enough :-(

Hope this helps.

Later.

-- 
Colin Wood                                 cwood@ichips.intel.com
Component Design Engineer - MD6                 Intel Corporation
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I speak only on my own behalf, not for my employer.