See gettytab(5) followed by ttys(5).
/etc/gettytab has entries for various types of terminals in a very generic
sense (not in the termcap(5) sense), and /etc/ttys is where the arguments to
getty(8) are placed as part of the configuration of init(8) a.k.a. /etc/init
or in modern BSD /sbin/init
Erik <fair(a)clock.org>