TD_DU              75 src/dps8/dps8_addrmods.c         case TD_DU: // none; operand has the form y || (00...0)18
TD_DU             518 src/dps8/dps8_addrmods.c         if (Td == TD_DU || Td == TD_DL)
TD_DU             736 src/dps8/dps8_addrmods.c                 if (Td == TD_DU || Td == TD_DL)
TD_DU             189 src/dps8/dps8_ins.c     if (Tm == TM_R && Td == TD_DU)