TMXR_GUARD       1596 src/simh/sim_tmxr.c             lp->rxbsz - TMXR_GUARD);                    /* leave spc for Telnet cruft */
TMXR_GUARD       1867 src/simh/sim_tmxr.c     if ((!lp->txbfd) && ((unsigned long int)TXBUF_AVAIL (lp) <= TMXR_GUARD)) /* near full? */