ctlr_idx         1415 src/dps8/dps8_mt.c     uint ctlr_idx = get_ctlr_idx (iomUnitIdx, chan);
ctlr_idx         1422 src/dps8/dps8_mt.c         struct ctlr_to_dev_s * p = & cables->mtp_to_tape[ctlr_idx][dev_code];