SCPE_NXM         1642 src/dps8/dps8_cpu.c         return SCPE_NXM;
SCPE_NXM         1655 src/dps8/dps8_cpu.c     if (addr >= MEMSIZE) return SCPE_NXM;
SCPE_NXM         7356 src/simh/scp.c             reason = SCPE_NXM;
SCPE_NXM         7447 src/simh/scp.c             return SCPE_NXM;