SCPE_NXM         1632 src/dps8/dps8_cpu.c         return SCPE_NXM;
SCPE_NXM         1645 src/dps8/dps8_cpu.c     if (addr >= MEMSIZE) return SCPE_NXM;
SCPE_NXM         7183 src/simh/scp.c             reason = SCPE_NXM;
SCPE_NXM         7274 src/simh/scp.c             return SCPE_NXM;