MTSE_INVRL       2399 src/dps8/dps8_mt.c     else if (code == MTSE_INVRL)
MTSE_INVRL        803 src/simh/sim_tape.c     return MTSE_INVRL;
MTSE_INVRL        863 src/simh/sim_tape.c     return MTSE_INVRL;