SCPE_MISVAL      3619 src/simh/scp.c             return SCPE_MISVAL;
SCPE_MISVAL      3633 src/simh/scp.c             return SCPE_MISVAL;
SCPE_MISVAL      2111 src/simh/sim_tape.c         return SCPE_MISVAL;                                     /*     then report a missing value */
SCPE_MISVAL       612 src/simh/sim_tmxr.c     code = SCPE_MISVAL;                                 /* no, so report missing */
SCPE_MISVAL      3799 src/simh/sim_tmxr.c     return SCPE_MISVAL;                                 /* "Missing value" error */