prt_unit_idx     1888 src/dps8/dps8_prt.c static t_stat signal_prt_ready (uint prt_unit_idx) {
prt_unit_idx     1892 src/dps8/dps8_prt.c   uint ctlr_unit_idx = cables->prt_to_urp[prt_unit_idx].ctlr_unit_idx;
prt_unit_idx     1903 src/dps8/dps8_prt.c 
prt_unit_idx     1922 src/dps8/dps8_prt.c       uint dev_code     = cables->prt_to_urp[prt_unit_idx].dev_code;