t_ispeed
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
tp->t_ispeed = t->c_ispeed;
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
tp->t_ispeed = t->c_ispeed;
dt->c_ispeed = tp->t_ispeed;
tp->t_ispeed = t->c_ispeed;
cps = tp->t_ispeed / 10;
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
tp->t_ispeed = TTYDEF_SPEED;
tp->t_ispeed = tio->c_ispeed;