UNIT_NUM          630 src/dps8/dps8_scu.c     long scu_unit_idx = UNIT_NUM (uptr);
UNIT_NUM          695 src/dps8/dps8_scu.c     long scu_unit_idx = UNIT_NUM (uptr);
UNIT_NUM          847 src/dps8/dps8_scu.c     long scu_unit_idx = UNIT_NUM (uptr);