Is it  correct that -current kernels    for NetBSD/i386
   use LBA adressing as default ?
   I`m trying to boot the INST-10A kernel from may 25 on
   a PC with 540meg IDE disk and cannot acces the hd (device wd0x
   not configured, but reported on bootup. disklabel shows
   correct partition table but instead of FS types only "unused").
   This problem does not occur with  the 1.0 disk set.
   The only difference I can see at startup is that the 1.0A kernel
   wants to use "16 bit PIO, LBA adressing", the 1.0 not.

I'm not sure how you could correlate the two, especially since there
is no correlation.  The -current disk drivers will not allow you to
open a partition other than `d' if its type is FS_UNUSED.  You need to
fix your partition table.