SCPE_MISVAL      3404 src/simh/scp.c             return SCPE_MISVAL;
SCPE_MISVAL      3411 src/simh/scp.c             return SCPE_MISVAL;
SCPE_MISVAL      2082 src/simh/sim_tape.c         return SCPE_MISVAL;                                     /*     then report a missing value */
SCPE_MISVAL       621 src/simh/sim_tmxr.c     code = SCPE_MISVAL;                                 /* no, so report missing */
SCPE_MISVAL      3796 src/simh/sim_tmxr.c     return SCPE_MISVAL;                                 /* "Missing value" error */