sim_tape_wrtmk   2139 src/dps8/dps8_mt.c         ret = sim_tape_wrtmk (unitp);
sim_tape_wrtmk   1007 src/simh/sim_tape.c     r = sim_tape_wrtmk (uptr);
sim_tape_wrtmk    166 src/simh/sim_tape.h t_stat sim_tape_wrtmk (UNIT *uptr);