SCPE_NXM         1636 src/dps8/dps8_cpu.c         return SCPE_NXM;
SCPE_NXM         1649 src/dps8/dps8_cpu.c     if (addr >= MEMSIZE) return SCPE_NXM;
SCPE_NXM         7300 src/simh/scp.c             reason = SCPE_NXM;
SCPE_NXM         7391 src/simh/scp.c             return SCPE_NXM;