SCPE_TTYERR      6028 src/simh/scp.c     return SCPE_TTYERR;
SCPE_TTYERR      2004 src/simh/sim_console.c     return SCPE_TTYERR;
SCPE_TTYERR      2023 src/simh/sim_console.c     return SCPE_TTYERR;
SCPE_TTYERR      2051 src/simh/sim_console.c     return SCPE_TTYERR;
SCPE_TTYERR      2056 src/simh/sim_console.c         return SCPE_TTYERR;