{
 Terminal subfunction codes
}
    tf_ast = 000010B; tf_bin = 000002B; tf_cbf = 000040B; tf_cco = 000040B;
    tf_esq = 000020B; tf_not = 000002B; tf_ral = 000010B; tf_rcu = 000001B;
    tf_rnc = 000040B; tf_rne = 000020B; tf_rst = 000001B; tf_syn = 000200B;
    tf_tmo = 000200B; tf_wal = 000010B; tf_wbt = 000100B; tf_wms = 000020B;
    tf_xcc = 000001B; tf_xof = 000100B;