UNIT_NUM          630 src/dps8/dps8_scu.c     long scu_unit_idx = UNIT_NUM (uptr);
UNIT_NUM          698 src/dps8/dps8_scu.c     long scu_unit_idx = UNIT_NUM (uptr);
UNIT_NUM          853 src/dps8/dps8_scu.c     long scu_unit_idx = UNIT_NUM (uptr);