/*  Allocate and Initialise TTL */
        s = &dev->subdevices[5];
-       if (this_board->i_NbrTTLChannel) {
-               s->type = COMEDI_SUBD_TTLIO;
-               s->subdev_flags =
-                       SDF_WRITEABLE | SDF_READABLE | SDF_GROUND | SDF_COMMON;
-               s->n_chan = this_board->i_NbrTTLChannel;
-               s->maxdata = 1;
-               s->io_bits = 0; /* all bits input */
-               s->len_chanlist = this_board->i_NbrTTLChannel;
-               s->range_table = &range_digital;
-               s->insn_config = this_board->ttl_config;
-               s->insn_bits = this_board->ttl_bits;
-               s->insn_read = this_board->ttl_read;
-               s->insn_write = this_board->ttl_write;
-       } else {
-               s->type = COMEDI_SUBD_UNUSED;
-       }
+       s->type = COMEDI_SUBD_UNUSED;
 
        /* EEPROM */
        s = &dev->subdevices[6];