UNIT_NUM          638 src/dps8/dps8_scu.c     long scu_unit_idx = UNIT_NUM (uptr);
UNIT_NUM          706 src/dps8/dps8_scu.c     long scu_unit_idx = UNIT_NUM (uptr);
UNIT_NUM          861 src/dps8/dps8_scu.c     long scu_unit_idx = UNIT_NUM (uptr);