rptXnOld         1627 src/dps8/dps8_cpu.h     word18 rptXnOld;
rptXnOld          581 src/dps8/dps8_faults.c           cpu.rX[cpu.rptXn] = cpu.rptXnOld;
rptXnOld         1917 src/dps8/dps8_ins.c         cpu.rptXnOld   = cpu.rX[Xn];