SCPE_NXM         1604 src/dps8/dps8_cpu.c         return SCPE_NXM;
SCPE_NXM         1617 src/dps8/dps8_cpu.c     if (addr >= MEMSIZE) return SCPE_NXM;
SCPE_NXM         7105 src/simh/scp.c             reason = SCPE_NXM;
SCPE_NXM         7196 src/simh/scp.c             return SCPE_NXM;