tmxr_get_packet_ln_ex 1518 src/simh/sim_tmxr.c return tmxr_get_packet_ln_ex (lp, pbuf, psize, 0);
tmxr_get_packet_ln_ex  223 src/simh/sim_tmxr.h t_stat tmxr_get_packet_ln_ex (TMLN *lp, const uint8 **pbuf, size_t *psize, uint8 frame_byte);