I recently upgraded my Amiga to NetBSD 1.0 binaries and a kernel SUPed on
   Dec. 4.  It built OK, but had a few oddities; among other things,
   the default terminal type is "su", instead of "vt200".

   I posted my config file to amiga-dev and a couple of people noted that I
   had disabled COMPAT_09 and COMPAT_43.  So I put these back in and rebuilt.
   The resulting kernel works "properly".

   However, this brings up the obvious question: why do 1.0 binaries running
   under a 4.4-based OS require 4.3 and NetBSD 0.9 compatibility?

You shouldn't need COMPAT_09, but some programs still use the old tty
ioctls, and the compatibility code is enabled with COMPAT_43.