SCPE_IOERR       5852 src/simh/scp.c     return SCPE_IOERR;
SCPE_IOERR       6787 src/simh/scp.c                 reason = SCPE_IOERR;
SCPE_IOERR       6873 src/simh/scp.c                 return SCPE_IOERR;
SCPE_IOERR       8223 src/simh/scp.c     return SCPE_IOERR;
SCPE_IOERR       8239 src/simh/scp.c     return SCPE_IOERR;
SCPE_IOERR       1050 src/simh/sim_disk.c     return SCPE_IOERR;