EG_BUFLEN
sc->eg_inbuf = malloc(EG_BUFLEN, M_TEMP, M_NOWAIT);
sc->eg_outbuf = malloc(EG_BUFLEN, M_TEMP, M_NOWAIT);
sc->eg_pcb[6] = EG_BUFLEN & 0xff; /* our buffer size */
sc->eg_pcb[7] = (EG_BUFLEN >> 8) & 0xff;