OpenBSD-4.6/etc/etc.alpha/sysctl.conf

#machdep.unaligned_print=0	# 0 - disable printing of unaligned access
#machdep.unaligned_fix=0	# 0 - disable fixup of unaligned access
#machdep.unaligned_sigbus=0	# 0 - don't sigbus on unaligned access
#machdep.allowaperture=1	# see xf86(4)
#kern.emul.osf1=1		# enable running OSF/1 binaries