SCPE_IOERR       5639 src/simh/scp.c     return SCPE_IOERR;
SCPE_IOERR       6574 src/simh/scp.c                 reason = SCPE_IOERR;
SCPE_IOERR       6660 src/simh/scp.c                 return SCPE_IOERR;
SCPE_IOERR       8010 src/simh/scp.c     return SCPE_IOERR;
SCPE_IOERR       8026 src/simh/scp.c     return SCPE_IOERR;
SCPE_IOERR       1050 src/simh/sim_disk.c     return SCPE_IOERR;